1
Prod = FOL +
2
types "*" 2 (infixl 20)
3
arities "*" :: (term,term)term
4
consts fst :: "'a * 'b => 'a"
5
snd :: "'a * 'b => 'b"
6
Pair :: "['a,'b] => 'a * 'b" ("(1<_,/_>)")
7
rules fst "fst(<a,b>) = a"
8
snd "snd(<a,b>) = b"
9
end