diff --git a/surete/tp_ltl/.gitignore b/surete/tp_ltl/.gitignore
new file mode 100644
index 0000000..0b81a20
--- /dev/null
+++ b/surete/tp_ltl/.gitignore
@@ -0,0 +1,2 @@
+/venv
+__pycache__
\ No newline at end of file
diff --git a/surete/tp_ltl/requirements.txt b/surete/tp_ltl/requirements.txt
new file mode 100644
index 0000000..abecf5d
--- /dev/null
+++ b/surete/tp_ltl/requirements.txt
@@ -0,0 +1 @@
+graphviz
\ No newline at end of file
diff --git a/surete/tp_ltl/run.sh b/surete/tp_ltl/run.sh
new file mode 100755
index 0000000..139a0d5
--- /dev/null
+++ b/surete/tp_ltl/run.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+set -e
+cd "$(dirname "$(realpath "$0")")"
+
+
+if ! [ -d venv ]
+then ./setup.sh
+fi
+. venv/bin/activate
+
+
+python src/product.py
diff --git a/surete/tp_ltl/setup.sh b/surete/tp_ltl/setup.sh
new file mode 100755
index 0000000..495b249
--- /dev/null
+++ b/surete/tp_ltl/setup.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+set -e
+cd "$(dirname "$(realpath "$0")")"
+
+
+python -m venv venv
+. venv/bin/activate
+
+
+pip install -r requirements.txt
diff --git a/surete/tp_ltl/src/GBA.py b/surete/tp_ltl/src/GBA.py
new file mode 100644
index 0000000..4469cfe
--- /dev/null
+++ b/surete/tp_ltl/src/GBA.py
@@ -0,0 +1,119 @@
+# -*-coding:UTF-8 -*
+from typing import Iterable, TypeVar
+from graphviz import Digraph
+
+
+from utils import edge, state
+
+
+def fstr(formula: frozenset[str]):
+	form_str = ""
+	for l in formula:
+		form_str = form_str+l+','
+	return form_str[:-1]
+	
+
+def is_consistent(formula):
+	for l in formula:
+		if "~"+l in formula:
+			return False
+	return True
+
+
+# Generalized Buchi Automata
+class GBA[T]:
+
+	def __init__(self, all_states: Iterable[state[T]], initial_states: Iterable[state[T]], propositions: Iterable[str], edges: list[edge[T]], acceptings: Iterable[Iterable[state[T]]]):
+		# States: a set of integers
+		self.all_states = set(all_states)
+		# Initial states: a set of integers
+		self.initial_states = set(initial_states).intersection(self.all_states)
+		# There must be an initial state; if there isn't, an initial state 0
+		# is added
+		if not self.initial_states:
+			self.initial_states.add(0)
+			self.all_states.add(0)
+		self.accepting_states = list[set[state[T]]]()
+		for final in acceptings:
+			self.accepting_states.append(set(final).intersection(self.all_states))
+		self.ap = set(propositions)
+		self.formulas = {frozenset(formula) for (_,formula,_) in edges}
+		self.next_states = {(state, formula): set()
+							for state in self.all_states
+							for formula in self.formulas}
+		for edge in edges:
+			if (edge[0] in self.all_states) and (edge[2] in self.all_states) and is_consistent(edge[1]):
+				self.next_states[(edge[0], frozenset(edge[1]))].add(edge[2])
+		self.labels = {state:str(state) for state in self.all_states}
+
+	# Adds a new state to the structure
+	def add_state(self):
+		add_state = max([s for s in self.all_states if type(s) is int]) + 1
+		self.all_states.add(add_state)
+		for formula in self.formulas:
+			self.next_states[add_state,formula] = set()
+		self.labels[add_state]= str(add_state)
+		return add_state
+		
+	def add_initial(self, state: int):
+		self.initial_states.add(state)
+		return state
+
+	# Adds a new edge from the state 'origin' to the state 'destination'
+	def add_edge(self, origin, formula, destination):
+		if origin in self.all_states:
+			if destination in self.all_states:
+				if not frozenset(formula) in self.formulas:
+					self.formulas.add(frozenset(formula))
+					for st in self.all_states:
+						self.next_states[(st, frozenset(formula))] = set()
+				self.next_states[(origin, frozenset(formula))].add(destination)
+			else:
+				raise KeyError("The destination " + str(destination) \
+						+ " isn't a known state.")
+		else:
+				raise KeyError("The origin " + str(origin) \
+					+ " isn't a known state.")
+		
+	def change_accept(self, sets):
+		self.accepting_states = []
+		for s in sets:
+			self.accepting_states.append(set(s))
+
+
+	# Returns the set of all states reachable from the state 'origin'
+	# with one transition
+	def get_successors(self, origin, formula):
+		if not origin in self.all_states:
+			raise KeyError("The origin " + str(origin) \
+					+ " isn't a known state.")
+		return self.next_states[(origin, formula)]
+
+	# Exports a picture of the automaton to 'file'.pdf.
+	def export(self, file: str):
+		graph = Digraph(filename = file)
+		graph.graph_attr['rankdir'] = 'LR'
+		for state in self.all_states:
+			node_shape = 'circle'
+			graph.attr('node', shape = node_shape, style = 'filled', \
+					fillcolor = 'white')
+			graph.node(str(state), label = self.labels[state])
+			if state in self.initial_states:
+				graph.node(str(state) + "_i", style = "invisible")
+				graph.edge(str(state) + "_i", str(state))
+		for state in self.all_states:
+			for formula in self.formulas:
+				for next_state in self.next_states[(state, formula)]:
+					if not formula:
+						edge_label = "True"
+					else:
+						edge_label = fstr(formula)
+					graph.edge(str(state), str(next_state), label=edge_label,
+							color='black')
+		graph.render()
+
+
+if __name__ == "__main__":						
+	#exemple
+	exempleCours=GBA([0,1],[0,1],["a","b"],[(0,["b"],0),(0,["a","b"],1),(1,["a","b"],1)],[[1]])
+	exempleCours.export("GBAexemple")
diff --git a/surete/tp_ltl/src/LTL.py b/surete/tp_ltl/src/LTL.py
new file mode 100644
index 0000000..46b6ea6
--- /dev/null
+++ b/surete/tp_ltl/src/LTL.py
@@ -0,0 +1,391 @@
+# -*-coding:UTF-8 -*
+from graphviz import Digraph
+
+
+# A pseudo-LR(1) parser for simple regular expressions, based on the following
+# context-free grammar G:
+# [1] E -> 's'
+# where s is any sequence of characters not featuring ().+~XGFU
+# [2] E -> '('E')'
+# [3] E -> '~'E*
+# [4] E -> 'X'E*
+# [5] E -> 'G'E*
+# [6] E -> 'F'E*
+# [7] E -> E('U'E)*
+# [8] E -> E('.'E)*
+# [9] E -> E('+'E)*
+# The rules being ordered by decreasing priority.
+
+
+# A class for input tokens
+class token:
+
+	def __init__(self, type_t: str, value_t: (str | None) = None):
+		# The string 'type' stands for the symbol in the grammar's terminals
+		# matched to the token.
+		self.type = type_t
+		# The string 'value' stands for the value carried by tokens of type "s".
+		self.value = value_t
+
+
+# A tree-based representation of regular expresssions
+class LTL:
+
+	def __init__(self, root: str, children: list["LTL"] = []):
+		# The string attribute 'root' stands for the operator labelling the
+		# root.
+		self.root = root
+		# The list attribute 'children'
+		self.children = children
+
+	# Exports a picture of the regular expression tree to 'file'.pdf.
+	def export(self, file: str):
+		graph = Digraph(filename = file)
+		graph.graph_attr['rankdir'] = 'TB'
+		if self.children:
+			graph.attr('node', shape = 'circle', style = 'filled', \
+					fillcolor = 'white')
+			graph.node("0", label = self.root)
+			write_graph(self, "0", graph)
+		else:
+			graph.attr('node', shape = 'box', style = 'filled', \
+					fillcolor = 'white')
+			graph.node("0", label = self.root)
+		graph.render()
+	
+		
+	def copy(self):
+		cpchildren = list[LTL]()
+		for child in self.children:
+			cpchildren.append(child.copy())
+		return LTL(self.root, cpchildren)
+		
+	def convertNNF(self):
+		if self.root == "non":
+			child = self.children[0]
+			self.root = child.root
+			self.children = child.children
+			self.negativeNNF()
+		else:
+			for child in self.children:
+				child.convertNNF()
+		
+	def negativeNNF(self):
+		if not self.children:
+			self.children=[LTL(self.root, self.children)]
+			self.root="non"
+		elif self.root == "non":
+			child = self.children[0]
+			self.root = child.root
+			self.children = child.children
+			self.convertNNF()
+		else:
+			if self.root == "et":
+				self.root = "ou"
+			elif self.root == "ou":
+				self.root = "et"
+			elif self.root == "U":
+				self.root = "R"
+			elif self.root == "R":
+				self.root = "U"
+			elif self.root == "G":
+				self.root = "F"
+			elif self.root == "F":
+				self.root = "G"
+			for child in self.children:
+				child.negativeNNF()
+				
+	def equals(self, formula):
+		if self.root != formula.root:
+			return False
+		for i in range(len(self.children)):
+			if not (self.children[i].equals(formula.children[i])):
+				return False
+		return True
+
+# Writes in the Graphviz graph 'graph' the tree structure of the regular
+# expression 'LTL', starting from its root 'root_string'.
+def write_graph(LTL, root_string: str, graph: Digraph):
+	if LTL.children:
+		index = 0
+		for child in LTL.children:
+			child_root = root_string + str(index)
+			if not child.children:
+				graph.attr('node', shape = 'box', style = 'filled', \
+					fillcolor = 'white')
+				lab = child.root if child.root else "<&#949;>"
+				graph.node(child_root, label = lab)
+				graph.edge(root_string, child_root)
+			else:
+				graph.attr('node', shape = 'circle', style = 'filled', \
+					fillcolor = 'white')
+				graph.node(child_root, label = child.root)
+				graph.edge(root_string, child_root)
+				write_graph(child, child_root, graph)
+			index += 1
+
+
+# A class for terminal and non-terminal symbols the parser can push on the
+# stack
+class symbol:
+
+	def __init__(self, type_t: str, LTL_tree: (LTL | None) =None):
+		# The string 'type' stands for the symbol in the grammar's vocabulary
+		# matched to the symbol.
+		self.type = type_t
+		# The LTL 'tree' stands for the regular expression matched to the
+		# symbol, based on the parsing operations applied so far.
+		self.tree = LTL_tree
+
+
+# A class for the bottom-up parsing process
+class LTL_Parser:
+
+	def __init__(self, LTL_string: str):
+		# The input string 'stream' from which tokens are generated
+		self.stream = LTL_string
+		# The list 'stack' that stands for the parsing stack.
+		self.stack = list[symbol]()
+
+	# Returns the head token of the string attribute 'stream'; if the latter is
+	# empty, returns the end of file token "$" instead.
+	def look_ahead(self):
+		if not self.stream:
+			return token("$", "$")
+		if self.stream[0] in ["(", ")", ".", "+", "X", "U", "~", "G", "F", "R"]:
+			return token(self.stream[0], self.stream[0])
+		else:
+			index = 0
+			while index < len(self.stream):
+				if self.stream[index] in ["(", ")", ".", "+", "X", "U","~", "G", "F", "R"]:
+					break
+				index += 1
+			return token("s", self.stream[0:index])
+
+	# Removes and returns the head token of the string attribute 'stream'; if
+	# if the input stream is empty while expecting a token of type 'head_type',
+	# raises an error.
+	def pop_stream(self, head_type = ""):
+		if not self.stream:
+			if head_type:
+				raise IndexError("End of string reached prematurely while " \
+					"looking for token '" + head_type + "'.")
+			else:
+				raise IndexError("End of string reached prematurely.")
+		stream_head = self.look_ahead()
+		assert isinstance(stream_head, token)
+		assert stream_head.value is not None
+		self.stream = self.stream[len(stream_head.value):]
+		return stream_head
+
+	# Checks if rule [1] can be applied.
+	def check_string_rule(self):
+		return (len(self.stack) > 0) and (self.stack[-1].type == "s")
+
+	# Checks if rule [2] can be applied.
+	def check_par_rule(self):
+		return (len(self.stack) > 2) and (self.stack[-1].type == ")") \
+			and (self.stack[-2].type == "E") and (self.stack[-3].type == "(") \
+
+	# Checks if rule [3] can be applied.
+	def check_not_rule(self, look_ahead_t):
+		return (len(self.stack) > 1) and (self.stack[-2].type == "~") \
+			and (self.stack[-1].type == "E")
+	# Checks if rule [4] can be applied.
+	def check_next_rule(self):
+		return (len(self.stack) > 1) and (self.stack[-2].type == "X") \
+			and (self.stack[-1].type == "E")
+			
+	# Checks if rule [5] can be applied.	   
+	def check_G_rule(self, look_ahead_t):
+		return (len(self.stack) > 1) and (self.stack[-2].type == "G") \
+			and (self.stack[-1].type == "E")
+			
+	# Checks if rule [6] can be applied.
+	def check_F_rule(self, look_ahead_t):
+		return (len(self.stack) > 1) and (self.stack[-2].type == "F") \
+			and (self.stack[-1].type == "E")
+			
+	# Checks if rule [7] can be applied; the type of the next token
+	# 'look_ahead_t' is required in order to solve shift-reduce conflicts
+	# by applying the grammar's priority rules.
+	def check_until_rule(self, look_ahead_t):
+		return (len(self.stack) > 2) and (self.stack[-1].type == "E") \
+			and (self.stack[-2].type == "U") and (self.stack[-3].type == "E") \
+			and not (look_ahead_t in {"X","G","F","~"})
+
+	# Checks if rule [8] can be applied; the type of the next token
+	# 'look_ahead_t' is required in order to solve shift-reduce conflicts
+	# by applying the grammar's priority rules.
+	def check_dot_rule(self, look_ahead_t):
+		return (len(self.stack) > 2) and (self.stack[-1].type == "E") \
+			and (self.stack[-2].type == ".") and (self.stack[-3].type == "E") \
+			and not (look_ahead_t in {"X","G","F","~","U"})
+
+	# Checks if rule [9] can be applied; the type of the next token
+	# 'look_ahead_t' is required in order to solve shift-reduce conflicts
+	# by applying the grammar's priority rules.
+	def check_plus_rule(self, look_ahead_t):
+		return (len(self.stack) > 2) and (self.stack[-1].type == "E") \
+			and (self.stack[-2].type == "+") and (self.stack[-3].type == "E") \
+			and not (look_ahead_t in {"X","G","F","~","U","."})
+
+	# Checks if the implicit initial rule Z -> E'$' can be applied. Note that
+	# the end of file symbol is never pushed on the stack; it merely appears
+	# as an incoming token of type 'look_ahead_t' instead. Moreover, the stack
+	# must consist in a single non-terminal symbol E in order to avoid
+	# accepting with a non-empty stack.
+	def check_initial_rule(self, look_ahead_t):
+		return (len(self.stack) == 1) and (self.stack[0].type == "E") \
+			and (look_ahead_t == "$")
+
+	# Applies rule [1].
+	def apply_string_rule(self):
+		tree = self.stack[-1].tree
+		self.stack = self.stack[:-1]
+		self.stack.append(symbol("E", tree))
+
+	# Applies rule [2].
+	def apply_par_rule(self):
+		tree = self.stack[-2].tree
+		self.stack = self.stack[:-3]
+		self.stack.append(symbol("E", tree))
+
+	# Applies rule [3].
+	def apply_not_rule(self):
+		tree = self.stack[-1].tree
+		assert tree is not None
+		self.stack = self.stack[:-2]
+		self.stack.append(symbol("E", LTL("non", [tree])))
+		
+	# Applies rule [4].
+	def apply_next_rule(self):
+		tree = self.stack[-1].tree
+		assert tree is not None
+		self.stack = self.stack[:-2]
+		self.stack.append(symbol("E", LTL("X", [tree])))
+		
+	# Applies rule [5].	
+	def apply_G_rule(self):
+		tree = self.stack[-1].tree
+		assert tree is not None
+		self.stack = self.stack[:-2]
+		self.stack.append(symbol("E", LTL("G", [tree])))
+	
+	# Applies rule [6].
+	def apply_F_rule(self):
+		tree = self.stack[-1].tree
+		assert tree is not None
+		self.stack = self.stack[:-2]
+		self.stack.append(symbol("E", LTL("F", [tree])))
+		
+	# Applies rule [7].
+	def apply_until_rule(self):
+		right_tree = self.stack[-1].tree
+		left_tree = self.stack[-3].tree
+		assert right_tree is not None
+		assert left_tree is not None
+		self.stack = self.stack[:-3]
+		self.stack.append(symbol("E", LTL("U", [left_tree, right_tree])))
+
+	# Applies rule [8].
+	def apply_dot_rule(self):
+		right_tree = self.stack[-1].tree
+		left_tree = self.stack[-3].tree
+		assert right_tree is not None
+		assert left_tree is not None
+		self.stack = self.stack[:-3]
+		self.stack.append(symbol("E", LTL("et", [left_tree, right_tree])))
+
+	# Applies rule [9].
+	def apply_plus_rule(self):
+		right_tree = self.stack[-1].tree
+		left_tree = self.stack[-3].tree
+		assert right_tree is not None
+		assert left_tree is not None
+		self.stack = self.stack[:-3]
+		self.stack.append(symbol("E", LTL("ou", [left_tree, right_tree])))
+
+	# Shifts the incoming token of type 'look_ahead_t' on the stack.
+	def shift(self, look_ahead_t):
+		new_token = self.pop_stream(look_ahead_t)
+		# String tokens carry a simple regular expression tree reduced to
+		# a single node.
+		if new_token.type == "s":
+			if new_token.value == "ε":
+				self.stack.append(symbol("s", LTL("")))
+			else:
+				assert new_token.value is not None
+				self.stack.append(symbol("s", LTL(new_token.value)))
+		# Other terminal symbols do not carry syntactic trees.
+		else:
+			self.stack.append(symbol(new_token.type))
+
+	# The parser itself. It either returns a LTL tree or raises a SyntaxError
+	# once it has read the entire stream yet cannot perform any reduction.
+	# The stack trace is shown if the Boolean 'trace' is true.
+	def parse(self, trace = False):
+		while True:
+			look_ahead = self.look_ahead()
+			# Shows the stack trace for debugging purposes.
+			if trace:
+				for symb in self.stack:
+					print(symb.type, end=";")
+				print()
+			# First tries to apply the reduction rules in their matching
+			# priority order.
+			if self.check_string_rule():
+				self.apply_string_rule()
+			elif self.check_par_rule():
+				self.apply_par_rule()
+			elif self.check_next_rule():
+				self.apply_next_rule()
+			elif self.check_not_rule(look_ahead.type):
+				self.apply_not_rule()
+			elif self.check_G_rule(look_ahead.type):
+				self.apply_G_rule()
+			elif self.check_F_rule(look_ahead.type):
+				self.apply_F_rule()
+			elif self.check_until_rule(look_ahead.type):
+				self.apply_until_rule()
+			elif self.check_dot_rule(look_ahead.type):
+				self.apply_dot_rule()
+			elif self.check_plus_rule(look_ahead.type):
+				self.apply_plus_rule()
+			# If the initial reduction can be performed, the parsing process
+			# succeeds.
+			elif self.check_initial_rule(look_ahead.type):
+				return self.stack[0].tree
+			# It otherwise shifts a token from the input stream, assuming it is
+			# not empty.
+			elif look_ahead.type != "$":
+				self.shift(look_ahead.type)
+			# The parser can no longer shift or reduce, hence, fails.
+			else:
+				raise SyntaxError("Can no longer shift a symbol or reduce" \
+					" a rule.")
+
+
+# Returns a tree of type LTL representing the string 'LTL_string'.
+def new_LTL(LTL_string: str):
+	parsed = LTL_Parser(LTL_string).parse()
+	assert parsed is not None
+	return parsed
+
+
+# Tests
+if __name__ == "__main__":
+	P1 = LTL_Parser("a")
+	P1_tokens = list[str]()
+	while P1.stream:
+		head = P1.look_ahead().value
+		assert head is not None
+		P1_tokens.append(head)
+		P1.pop_stream()
+	head = P1.look_ahead().value
+	assert head is not None
+	P1_tokens.append(head)
+	print(P1_tokens)
+	formule = new_LTL("~(a+X~a+Gb.F~c)")
+	formule.convertNNF()
+	formule.export("test")
diff --git a/surete/tp_ltl/src/LTLchecker.py b/surete/tp_ltl/src/LTLchecker.py
new file mode 100644
index 0000000..301381f
--- /dev/null
+++ b/surete/tp_ltl/src/LTLchecker.py
@@ -0,0 +1,34 @@
+from GBA import *
+from kripke import *
+from LTL import *
+from LTLtoGBA import *
+from product import *
+from emptyTest import *
+
+#Entrées : une formule LTL et une structure de Kripke et un ensemble de propositions atomiques
+#Sortie : renvoie True si ttes les traces de la structure satisfont la formule faux sinon
+def satisfait(formule: LTL, kripke: Kripke, /, *_):
+	neg = LTL("non", [formule]).convertNNF()
+	propositions = kripke.ap
+	gba1 = buildBuchi(neg, propositions)
+	gba2 = kripke.toGBA()
+	produit = product(gba1,gba2)
+	return is_GBA_empty(produit)
+
+if __name__ == "__main__":	
+	#machine à laver
+	propositions = ["b","f","d","v"]
+	mlaver=Kripke([0,1,2,3,4],[0],["b","f","d","v"],[(0,1),(0,2),(1,3),(1,0),(2,3),(3,2),(3,4),(4,4)],{0:set(),1:{"f"},2:{"b"},3:{"b","f"},4:{"b","f","d","v"}})
+	mlaver.export("mlaver")
+	#Test avec formule1, doit être faux
+	formule1 = new_LTL("F(d)")
+	satisfait(formule1, mlaver, ["b","f","d","v"])
+	#Test avec formule2, doit être vrai
+	formule2 = new_LTL("G(~d+f)")
+	satisfait(formule2, mlaver, ["b","f","d","v"])
+	#Test avec formule3, doit être vrai
+	formule3 = new_LTL("G(~d+G(d))")
+	satisfait(formule3, mlaver, ["b","f","d","v"])
+	#Test avec formule4, doit être vrai
+	formule4 = new_LTL("G(~d.~v)+F(d.v))")
+	satisfait(formule4, mlaver, ["b","f","d","v"])
diff --git a/surete/tp_ltl/src/LTLtoGBA.py b/surete/tp_ltl/src/LTLtoGBA.py
new file mode 100644
index 0000000..fb48c63
--- /dev/null
+++ b/surete/tp_ltl/src/LTLtoGBA.py
@@ -0,0 +1,260 @@
+# -*-coding:UTF-8 -*
+from LTL import *
+from GBA import *
+
+
+def equals(formules1: list[LTL], formules2: list[LTL]):
+	difference = formules1.copy()
+	for form1 in formules2:
+		equals = False
+		for form2 in formules1:
+			if form1.equals(form2):
+				difference.remove(form2)
+				equals = True
+		if not equals:
+			return False
+	return not difference
+
+
+def findall(val: list[tuple[list[LTL], int]], formule: list[LTL]):
+	result = set()
+	for couple in val:
+		if equals(formule,couple[0]):
+			result.add(couple[1])
+	return result
+
+
+def clean(formules: Iterable[LTL]):
+	new = list[LTL]()
+	for form1 in formules:
+		toAdd = True
+		for form2 in new:
+			if form1.equals(form2):
+				toAdd = False
+		if toAdd:
+			new.append(form1)
+	formules = new
+	return new
+
+
+def copy(formules: Iterable[LTL]):
+	result = list[LTL]()
+	for formule in formules:
+		result.append(formule.copy())
+	return result
+
+
+def is_in(formule, formules):
+	for formule2 in formules:
+		if formule.equals(formule2):
+			return True
+	return False
+
+
+def duplicate(state: int, structure: GBA, todo: dict[int, list[LTL]], val: list[tuple[list[LTL], int]], toExpand: list[int]):
+	statecp=structure.add_state()
+	if state in structure.initial_states:
+		structure.add_initial(statecp)
+	update_val(state, statecp, val)
+	todo[statecp]=copy(todo[state])
+	todo[state]=copy(todo[state])
+	toExpand.append(statecp)
+	return statecp
+
+
+def update_val(state, statecp, val):
+	for couple in val:
+		if couple[1]==state:
+			val.append((couple[0],statecp))
+	return val
+
+
+def traitET(formule: LTL, i: int, structure: GBA, todo: dict[int, list[LTL]], state: int, val: list[tuple[list[LTL], int]], toExpand: list[int]):
+	"""
+	Applies a 'AND' node of the LTL formula to the val.
+	"""
+	child1 = formule.children[0]
+	child2 = formule.children[1]
+	formulecp = copy(todo[state])
+	todo[state] = formulecp
+	formulecp[i] = child1
+	formulecp.append(child2)
+	val.append((formulecp,state))
+	return True
+
+
+def traitG(formule: LTL, i: int, structure: GBA, todo: dict[int, list[LTL]], state: int, val: list[tuple[list[LTL], int]], toExpand: list[int]):
+	child = formule.children[0]
+	formulecp = todo[state].copy()
+	todo[state] = formulecp
+	formulecp.append(child)
+	formulecp[i] = LTL("X", [formule])
+	val.append((formulecp,state))
+	return True
+
+
+def traitOU(formule: LTL, i: int, structure: GBA, todo: dict[int, list[LTL]], state: int, val: list[tuple[list[LTL], int]], toExpand: list[int]):
+	#on duplique l'état considéré pour avoir deux choix de transitions possibles
+	state2 = duplicate(state, structure, todo, val, toExpand)
+	#on récupère les formules à droite et à gauche du OU
+	child1 = formule.children[0]
+	child2 = formule.children[1]
+	#on modifie les formules courantes pour avoir dans un état child1 et dans l'autre child2
+	todo[state][i] =  child1.copy()
+	todo[state2][i] =  child2.copy()
+	#on ajoute le fait que state et state2 satisfont le nouvel ensemble de formules
+	val.append((todo[state], state))
+	val.append((todo[state2],state2))
+	return True
+
+
+def traitF(formule: LTL, i: int, structure: GBA, todo: dict[int, list[LTL]], state: int, val: list[tuple[list[LTL], int]], toExpand: list[int]):
+	#on duplique l'état considéré pour avoir deux choix de transitions possibles
+	state2 = duplicate(state, structure, todo, val, toExpand)
+	#on récupère la formule sous le F
+	child = formule.children[0]
+	#on construit la formule avec XF
+	nextF = LTL("X", [formule])
+	#on modifie les formules courantes pour avoir dans un état child et dans l'autre XF(child)
+	todo[state2][i] =  child
+	todo[state][i] = nextF
+	#on ajoute le fait que state et state2 satisfont le nouvel ensemble de formules
+	val.append((todo[state], state))
+	val.append((todo[state2],state2))
+	return True
+
+
+def traitU(formule: LTL, i: int, structure: GBA, todo: dict[int, list[LTL]], state: int, val: list[tuple[list[LTL], int]], toExpand: list[int]):
+	#on duplique l'état considéré pour avoir deux choix de transitions possibles
+	state2 = duplicate(state, structure, todo, val, toExpand)
+	#on récupère les formules à droite et à gauche du U
+	child1 = formule.children[0]
+	child2 = formule.children[1]
+	#on construit la formule avec X..U..
+	nextU = LTL("X", [formule])
+	#on modifie les formules courantes
+
+	#à compléter
+	todo[state2][i] = child2
+	todo[state][i]  = nextU
+	todo[state].append(child1.copy())
+
+	#on ajoute le fait que state et state2 satisfont le nouvel ensemble de formules
+	val.append((todo[state], state))
+	val.append((todo[state2],state2))
+	return True
+
+
+def traitement(done: bool, i: int, structure: GBA, todo: dict[int, list[LTL]], state: int, val: list[tuple[list[LTL], int]], toExpand: list[int]):
+	"""
+	Applies one step of the todo collection of LTL formulas.
+	"""
+	formule = todo[state][i]
+	if formule.root == "et":
+		return traitET(formule, i, structure, todo, state, val, toExpand)
+	elif formule.root == "ou":
+		return traitOU(formule, i, structure, todo, state, val, toExpand)
+	elif formule.root == "F":
+		return traitF(formule, i, structure, todo, state, val, toExpand)
+	elif formule.root == "G":
+		return traitG(formule, i, structure, todo, state, val, toExpand)
+	elif formule.root == "U":
+		return traitU(formule, i, structure, todo, state, val, toExpand)
+	else:
+		return False
+
+
+def buildBuchi(formule: LTL, propositions: list[str]):
+	"""
+	Builds a buchi state machine.
+
+	From the LTL formula and the possible propositions.
+	"""
+	structure = GBA([0],[0],propositions,[],[])
+	val=[([formule], 0)]
+	todo = {0:[formule]}
+	expandState(structure, todo, 0, val, [0])
+	accept_conditions(structure, todo, val)
+	return structure
+
+
+def expandState(structure: GBA, todo: dict[int, list[LTL]], state: int, val: list[tuple[list[LTL], int]], toExpand: list[int]):
+	"""
+	Creates all states from a collection of LTL transitions formulas (in todo).
+	"""
+	done = False
+	i = 0
+	while not done and i < len(todo[state]):
+		done = traitement(done, i, structure, todo, state, val, toExpand)
+		i=i+1
+	if not done:
+		toExpand = toExpand[1:]
+	if toExpand:
+		expandState(structure, todo, toExpand[0], val, toExpand)
+	else:
+		computeSucc(structure, todo, val)
+	return val
+
+
+def computeSucc(structure: GBA, todo: dict[int, list[LTL]], val: list[tuple[list[LTL], int]]):
+	states = structure.all_states.copy()
+	for state in states:
+		succ = findall(val, next(todo[state]))
+		if not succ:
+			new = structure.add_state()
+			val.append((next(todo[state]),new))
+			todo[new]=next(todo[state])
+			expandState(structure, todo, new, val, [new])
+			succ = findall(val, next(todo[state]))
+		label = now(todo[state])
+		if is_consistent(label):
+			for s in succ:
+				structure.add_edge(state,label, s)
+
+
+def accept_conditions(structure: GBA, todo: dict[int, list[LTL]], val: list[tuple[list[LTL], int]]):
+	cond = list[LTL]()
+	for couple in val:
+		for formule in couple[0]:
+			if formule.root in {"F","U"} and not is_in(formule,cond):
+				cond.append(formule)
+	sets = list[list[int]]()
+	for i in range(len(cond)):
+		formule = cond[i]
+		sets.append([])
+		for state in structure.all_states:
+			if not is_in(LTL("X", [formule]), todo[state]):
+				sets[i].append(state)
+	structure.change_accept(sets)
+	return structure
+
+
+def next(formules: Iterable[LTL]):
+	retour = list[LTL]()
+	for formule in formules:
+		if formule.root == "X":
+			retour.append(formule.children[0])
+	return retour
+
+
+def now(formules: Iterable[LTL]):
+	retour = list[str]()
+	for formule in formules:
+		if formule.root == "non":
+			retour.append("~"+formule.children[0].root)
+		if not formule.children:
+			assert type(formule.root) is str
+			retour.append(formule.root)
+	return retour
+
+
+if __name__ == "__main__":
+	formule = new_LTL("G(a).Fb")
+	trad = buildBuchi(formule, ["a","b"])
+	trad.export("trad")
+	print(trad.accepting_states)
+
+	formule = new_LTL("aUb")
+	trad = buildBuchi(formule, ["a","b"])
+	trad.export("trad_union")
+	print(trad.accepting_states)
diff --git a/surete/tp_ltl/src/buchi.py b/surete/tp_ltl/src/buchi.py
new file mode 100644
index 0000000..1544119
--- /dev/null
+++ b/surete/tp_ltl/src/buchi.py
@@ -0,0 +1,132 @@
+# -*-coding:UTF-8 -*
+from graphviz import Digraph
+from utils import edge
+
+
+def fstr(formula):
+	form_str = ""
+	for l in formula:
+		form_str = form_str+l+','
+	return form_str[:-1]
+	
+def is_consistent(formula):
+	for l in formula:
+		if "~"+l in formula:
+			return False
+	return True
+
+
+# Buchi automata
+class Buchi:
+
+	def __init__(self, all_states: list[int], initial_states: list[int], propositions: list[str], edges: list[edge], accepting: list[int]):
+
+		# States: a set of integers
+		self.all_states = set(all_states)
+		# Initial states: a set of integers
+		self.initial_states = set(initial_states).intersection(self.all_states)
+		# There must be an initial state; if there isn't, an initial state 0
+		# is added
+		if not self.initial_states:
+			self.initial_states.add(0)
+			self.all_states.add(0)
+		#Defining the set of accepting states
+		self.accepting_states = set(accepting)
+		#Defining the set of propositionnal variables
+		self.ap = set(propositions)
+		#We build the set of formulas appearing in transitions
+		#A formula is represented by a set of litterals ie a variable or its negation
+		if edges:
+			self.formulas = {frozenset(formula) for (_,formula,_) in edges}
+		else:
+			self.formulas = set()
+		self.next_states = {(state, formula): set()
+							for state in self.all_states
+							for formula in self.formulas}
+		for edge in edges:
+			if (edge[0] in self.all_states) and (edge[2] in self.all_states) and is_consistent(edge[1]):
+				self.next_states[(edge[0], frozenset(edge[1]))].add(edge[2])
+		self.labels = {state:str(state) for state in self.all_states}
+
+	# Adds a new state to the structure
+	def add_state(self):
+		add_state = max(self.all_states) + 1
+		self.all_states.add(add_state)
+		for formula in self.formulas:
+			self.next_states[add_state,formula] = set()
+		self.labels[add_state]= str(add_state)
+		return add_state
+		
+	def add_initial(self, state):
+		self.initial_states.add(state)
+		return state
+
+	# # Removes the state 'state' from the structure if it exists.
+	# def remove_state(self, state):
+	# 	if state in self.all_states:
+	# 		self.all_states.remove(state)
+	# 		if state in self.initial_states:
+	# 			self.initial_states.remove(state)
+	# 		del self.labels[state]
+	# 		del self.valuation[state]
+	# 		# Remove the successors of 'state', but also all the edges
+	# 		# leading to 'state'
+	# 		del self.next_states[state]
+	# 		for origin in self.all_states:
+	# 			if state in self.next_states[origin]:
+	# 				self.next_states[origin].remove(state)
+
+
+	# Adds a new edge from the state 'origin' to the state 'destination'
+	def add_edge(self, origin, formula, destination):
+		if origin in self.all_states:
+			if destination in self.all_states:
+				if not frozenset(formula) in self.formulas:
+					self.formulas.add(frozenset(formula))
+					for st in self.all_states:
+						self.next_states[(st, frozenset(formula))] = set()
+				self.next_states[(origin, frozenset(formula))].add(destination)
+			else:
+				raise KeyError("The destination " + str(destination) \
+						+ " isn't a known state.")
+		else:
+				raise KeyError("The origin " + str(origin) \
+					+ " isn't a known state.")
+
+
+	# Returns the set of all states reachable from the state 'origin'
+	# with one transition
+	def get_successors(self, origin, formula):
+		if not origin in self.all_states:
+			raise KeyError("The origin " + str(origin) \
+					+ " isn't a known state.")
+		return self.next_states[(origin, formula)]
+
+	# Exports a picture of the automaton to 'file'.pdf.
+	def export(self, file):
+		graph = Digraph(filename = file)
+		graph.graph_attr['rankdir'] = 'LR'
+		for state in self.all_states:
+			node_shape = 'circle'
+			if state in self.accepting_states:
+				node_shape = 'doublecircle'
+			graph.attr('node', shape = node_shape, style = 'filled', \
+					fillcolor = 'white')
+			graph.node(str(state), label = self.labels[state])
+			if state in self.initial_states:
+				graph.node(str(state) + "_i", style = "invisible")
+				graph.edge(str(state) + "_i", str(state))
+		for state in self.all_states:
+			for formula in self.formulas:
+				for next_state in self.next_states[(state, formula)]:
+					if not formula:
+						edge_label = "True"
+					else:
+						edge_label = fstr(formula)
+					graph.edge(str(state), str(next_state), label=edge_label,
+							color='black')
+		graph.render()
+		
+#exemple
+exempleCours=Buchi([0,1],[0,1],["a","b"],[(0,["b"],0),(0,["a","b"],1),(1,["a","b"],1)],[1])
+exempleCours.export("BuchiExemple")
diff --git a/surete/tp_ltl/src/emptyTest.py b/surete/tp_ltl/src/emptyTest.py
new file mode 100644
index 0000000..5488b9b
--- /dev/null
+++ b/surete/tp_ltl/src/emptyTest.py
@@ -0,0 +1,45 @@
+from GBA import GBA
+
+
+def dfs(gba : GBA, s1, s2, sets, eactuel, index, past):
+    if index == len(sets):
+        return eactuel == s2
+    past.add((eactuel, index))
+    for ns in gba.transitions[eactuel]:
+        if ns in sets[index] and (ns, index + 1) not in past:
+            return dfs(gba, s1, s2, ns, index + 1, past)
+        if (ns, index) not in past:
+            return dfs(gba, s1, s2, ns, index, past)
+    return False
+
+
+def path(gba: GBA, s1, s2, sets):
+    past = set()
+    return dfs(gba, s1,s2,  s1, 0, past)
+
+#Entrée : une formule sous forme de liste de littéraux (ie une variable ou sa négation)
+#Vérifie que cette formule est consistente cad qu'elle ne contient pas à la fois une variable et sa négation
+def is_consistent(formula):
+	for l in formula:
+		if "~"+l in formula:
+			return False
+	return True
+
+#Entrées : 1 automate de buchi
+#Sortie : renvoie True si cet automate n'admet aucune exécution et false sinon
+def is_Buchi_empty(buchi):
+	#à compléter
+	return False
+
+#Entrées : 1 automate de buchi généralisé
+#Sortie : renvoie True si cet automate n'admet aucune exécution et false sinon
+def is_GBA_empty(gba):
+	#à compléter
+	for init in gba.initial_state:
+		for accept in gba.accepting_sets:
+			for acc in accept:
+				if path(gba, init, acc, gba.accepting_sets):
+					return False
+	return True
+
+
diff --git a/surete/tp_ltl/src/kripke.py b/surete/tp_ltl/src/kripke.py
new file mode 100755
index 0000000..3d5f341
--- /dev/null
+++ b/surete/tp_ltl/src/kripke.py
@@ -0,0 +1,101 @@
+# -*-coding:UTF-8 -*
+from graphviz import Digraph
+from GBA import *
+
+
+KripkeEdge = tuple[int, int]
+
+
+# Kripke structure
+class Kripke:
+
+	def __init__(self, all_states: list[int], initial_states: list[int], propositions: list[str], edges: list[KripkeEdge], valuations: dict[int, set[str]]):
+
+		# States: a set of integers
+		self.all_states = set(all_states)
+		# Initial states: a set of integers
+		self.initial_states = set(initial_states).intersection(self.all_states)
+		# There must be an initial state; if there isn't, an initial state 0
+		# is added
+		if not self.initial_states:
+			self.initial_states.add(0)
+			self.all_states.add(0)
+		self.ap = propositions
+		self.next_states = {state: set[int]()
+							for state in self.all_states}
+		for edge in set(edges):
+			if (edge[0] in self.all_states) and (edge[1] in self.all_states):
+				self.next_states[edge[0]].add(edge[1])
+		self.valuation = valuations
+		self.labels = {state:str(self.valuation[state]) for state in self.all_states}
+
+	# Adds a new state to the structure
+	def add_state(self, val):
+		add_state = max(self.all_states) + 1
+		self.all_states.add(add_state)
+		self.next_states[add_state] = set()
+		self.valuation[add_state] = val
+		self.labels[add_state]= str(val)
+		return add_state
+
+	# Removes the state 'state' from the structure if it exists.
+	def remove_state(self, state):
+		if state in self.all_states:
+			self.all_states.remove(state)
+			if state in self.initial_states:
+				self.initial_states.remove(state)
+			del self.labels[state]
+			del self.valuation[state]
+			# Remove the successors of 'state', but also all the edges
+			# leading to 'state'
+			del self.next_states[state]
+			for origin in self.all_states:
+				if state in self.next_states[origin]:
+					self.next_states[origin].remove(state)
+
+
+	# Returns the set of all states reachable from the state 'origin'
+	# with one transition
+	def get_successors(self, origin):
+		if not origin in self.all_states:
+			raise KeyError("The origin " + str(origin) \
+					+ " isn't a known state.")
+		return self.next_states[origin]
+
+	# Exports a picture of the automaton to 'file'.pdf.
+	def export(self, file):
+		graph = Digraph(filename = file)
+		graph.graph_attr['rankdir'] = 'LR'
+		for state in self.all_states:
+			node_shape = 'circle'
+			graph.attr('node', shape = node_shape, style = 'filled', \
+					fillcolor = 'white')
+			graph.node(str(state), label = self.labels[state])
+			if state in self.initial_states:
+				graph.node(str(state) + "_i", style = "invisible")
+				graph.edge(str(state) + "_i", str(state))
+		for state in self.all_states:
+			for next_state in self.next_states[state]:
+				edge_colour = 'black'
+				edge_label = ""
+				graph.edge(str(state), str(next_state), label=edge_label,
+							color=edge_colour)
+		graph.render()
+		
+	
+	def toGBA(self):
+		edges = list[tuple[int, list[str], int]]()
+		for state in self.all_states:
+			val = list[str]()
+			for prop in self.ap:
+				if prop in self.valuation[state]:
+					val.append(prop)
+				else:
+					val.append("~"+prop)
+			for next_state in self.next_states[state]:
+				edges.append((state, val ,next_state))
+		return GBA(self.all_states, self.initial_states, self.ap, edges, [self.all_states])
+
+if __name__ == "__main__":				
+	mlaver=Kripke([0,1,2,3,4],[0],["b","f","d","v"],[(0,1),(0,2),(1,3),(1,0),(2,3),(3,2),(3,4),(4,4)],{0:set(),1:{"f"},2:{"b"},3:{"b","f"},4:{"b","f","d","v"}})
+	mlaver.toGBA().export("GBAlaver")
diff --git a/surete/tp_ltl/src/product.py b/surete/tp_ltl/src/product.py
new file mode 100644
index 0000000..95aefde
--- /dev/null
+++ b/surete/tp_ltl/src/product.py
@@ -0,0 +1,49 @@
+from GBA import *
+
+#Entrée : une formule sous forme de liste de littéraux (ie une variable ou sa négation)
+#Vérifie que cette formule est consistente cad qu'elle ne contient pas à la fois une variable et sa négation
+def is_consistent(formula: Iterable[str]):
+	for l in formula:
+		if "~" + l in formula:
+			return False
+	return True
+
+#Entrées : 2 automates de buchi généralisés
+#Sortie : le produit synchrone de ces automates
+def product[T, U](gba1: GBA[T], gba2: GBA[U]):
+	states = {(state1, state2) for state1 in gba1.all_states for state2 in gba2.all_states}
+	initials = {(state1, state2) for state1 in gba1.initial_states for state2 in gba2.initial_states}
+	formulas = {f1.union(f2) for f1 in gba1.formulas for f2 in gba2.formulas}
+	ap = gba1.ap.union(gba2.ap)
+	edges = list[edge]()
+
+
+	#à compléter
+	product_impl(gba1, gba2, edges)
+
+
+	accepting = list[frozenset[tuple[state[T], state[U]]]]()
+	for acc in gba1.accepting_states:
+		accepting.append(frozenset({(state1, state2) for state1 in acc for state2 in gba2.all_states}))
+	for acc in gba2.accepting_states:
+		accepting.append(frozenset({(state1, state2) for state1 in gba1.all_states for state2 in acc}))
+	return GBA(states, initials, ap, edges, accepting)
+
+
+def product_impl[T, U](gpa_left: GBA[T], gba_right: GBA[U], edges: list[edge[tuple[state[T], state[U]]]]):
+		for (d1, f1), dest1 in gpa_left.next_states.items():
+			for (d2, f2), dest2 in gba_right.next_states.items():
+				for item1 in dest1:
+					for item2 in dest2:
+						vari = f1.union(f2)
+						if is_consistent(vari):
+							edges.append(((d1, d2), vari, (item1, item2)))
+
+
+if __name__ == "__main__":
+	gba1 =GBA([0,1],[0,1],["a"],[(0,[],0),(0,["a"],1),(1,["a"],1)],[[1]])
+	gba2 =GBA([0,1],[0,1],["b"],[(0,[],0),(0,["b"],1),(1,["b"],1)],[[1]])
+	produitTest = product(gba1,gba2)
+	produitTest.export("produitTest")
+	produit = GBA([0,1,2,3],[0,1,2,3],["a", "b"],[(0,[],0),(0,["a","b"],3),(0,["a"],1),(1,["a"],1),(0,["b"],2),(1,["a","b"],3),(2,["b"],2), (2,["a","b"],3), (3,["a","b"],3)],[[1,3],[2,3]])
+	produit.export("produit")
diff --git a/surete/tp_ltl/src/py.typed b/surete/tp_ltl/src/py.typed
new file mode 100644
index 0000000..e69de29
diff --git a/surete/tp_ltl/src/utils.py b/surete/tp_ltl/src/utils.py
new file mode 100644
index 0000000..d0f6600
--- /dev/null
+++ b/surete/tp_ltl/src/utils.py
@@ -0,0 +1,9 @@
+from typing import Iterable, TypeVar
+
+T = TypeVar("T")
+edge = tuple[T | int, Iterable[str], T | int]
+del T
+
+T = TypeVar("T")
+state = T | int
+del T
\ No newline at end of file
diff --git a/surete/tp_ltl/sujet.pdf b/surete/tp_ltl/sujet.pdf
new file mode 100644
index 0000000..33f80b0
Binary files /dev/null and b/surete/tp_ltl/sujet.pdf differ
diff --git a/surete/tp_ltl/test/.gitignore b/surete/tp_ltl/test/.gitignore
new file mode 100644
index 0000000..4029495
--- /dev/null
+++ b/surete/tp_ltl/test/.gitignore
@@ -0,0 +1 @@
+/output
\ No newline at end of file
diff --git a/surete/tp_ltl/test/test.sh b/surete/tp_ltl/test/test.sh
new file mode 100755
index 0000000..bcdc95c
--- /dev/null
+++ b/surete/tp_ltl/test/test.sh
@@ -0,0 +1,42 @@
+#!/bin/bash
+set -e
+cd "$(dirname "$(realpath "$0")")"
+
+
+PROJ="$(dirname "$PWD")"
+
+
+if ! [ -f "$PROJ/venv/bin/activate" ]
+then "$PROJ/setup.sh"
+fi
+
+. "$PROJ/venv/bin/activate"
+
+
+rm -fr   output
+mkdir -p output
+cd output
+
+
+function run() {
+    src="$1"
+    name="$(basename "$src")"
+    (
+        set +e
+        python "$src" > "$name.log" 2>&1
+        if [ "$?" = "0" ]
+        then echo "OK  $name"
+        else echo "ERR $name	'test/output/$name.log'"
+        fi
+        set -e
+    ) || true
+}
+
+
+run "$PROJ/src/kripke.py"
+run "$PROJ/src/GBA.py"
+run "$PROJ/src/LTL.py"
+run "$PROJ/src/LTLchecker.py"
+run "$PROJ/src/LTLtoGBA.py"
+run "$PROJ/src/product.py"
+run "$PROJ/src/emptyTest.py"