diff --git a/affichage.ml b/affichage.ml
index bdedac4..fb39603 100644
--- a/affichage.ml
+++ b/affichage.ml
@@ -10,6 +10,14 @@ let rec string_of_ty = function
     let s2 = string_of_ty t2 in
     "(" ^ s1 ^ " -> " ^ s2 ^ ")"
   | Bot -> "False"
+  | And(t1, t2) ->
+    let s1 = string_of_ty t1 in
+    let s2 = string_of_ty t2 in
+    "(" ^ s1 ^ " /\\ " ^ s2 ^ ")"
+  | Or(t1, t2) ->
+    let s1 = string_of_ty t1 in
+    let s2 = string_of_ty t2 in
+    "(" ^ s1 ^ " \\/ " ^ s2 ^ ")"
 
 let rec string_of_expr = function
   Fun ((s, t), e) ->
diff --git a/lexer.mll b/lexer.mll
index 65ea1ee..21db775 100644
--- a/lexer.mll
+++ b/lexer.mll
@@ -27,6 +27,8 @@ rule token = parse
   | "->"            { TARR }
   | '~'             { TILDE }
   | "exf"           { EXFALSO }
+  | "/\\"           { AND }
+  | "\\/"           { OR }
 
   | "Goal"          { GOAL }
   | "exact"         { EXACT }
diff --git a/parser.mly b/parser.mly
index de6e43c..3725d09 100644
--- a/parser.mly
+++ b/parser.mly
@@ -9,6 +9,7 @@ open Parser_entry
 %token PLUS TIMES
 %token TOP BOT EXFALSO TILDE
 %token LPAREN RPAREN
+%token AND OR
 %token FUN ARR COLON TARR
 %token <string> VARID
 %token <string> TYID
@@ -19,6 +20,8 @@ open Parser_entry
 
 %right TARR
 %right TILDE
+%right AND
+%right OR
 
 %start main
 %type <parser_entry> main
@@ -50,6 +53,8 @@ ty:
   | BOT                     { Bot }
   | LPAREN t=ty RPAREN      { t }
   | TILDE t=ty              { Arr(t, Bot) }
+  | t1=ty AND t2=ty         { And(t1, t2) }
+  | t1=ty OR t2=ty          { Or(t1, t2) }
   | t1=ty TARR t2=ty        { Arr(t1, t2) }
 
 expression:
diff --git a/types.ml b/types.ml
index 810e3d0..6b319be 100644
--- a/types.ml
+++ b/types.ml
@@ -3,6 +3,8 @@ type ty_id = string
 type ty =
   TVar of ty_id
   | Arr of ty * ty
+  | And of ty * ty
+  | Or of ty * ty
   | Bot
 
 type gam = (ty_id * ty) list