c81507d35d11b2eedf7425a3bb52bceec3224532Christian Maedervars a : Type; b < a
01996e191c1a9a2251abf7740124b73bde771472Christian Maederop twice2 (f : a ->? b) (x : a) :? b = f(f(x))
01996e191c1a9a2251abf7740124b73bde771472Christian Maederop twice3 : (a ->? b) * a ->? b = \ (f : a ->? b, x : a) . f(f(x))
01996e191c1a9a2251abf7740124b73bde771472Christian Maederop twice : (a ->? b) -> a ->? b = \ f (x : a) . f(f(x))
01996e191c1a9a2251abf7740124b73bde771472Christian Maedervar f : a ->? b; x : a
01996e191c1a9a2251abf7740124b73bde771472Christian Maeder. twice f x = f(f(x))