16 lines
249 B
Text
16 lines
249 B
Text
exit
|
|
open nat
|
|
|
|
definition nrec [recursor] := @nat.rec
|
|
|
|
definition myadd x y :=
|
|
nrec y (λ n r, succ r) x
|
|
|
|
theorem myadd_zero : ∀ n, myadd n 0 = n :=
|
|
begin
|
|
intro n, induction n with n ih,
|
|
reflexivity,
|
|
esimp [myadd],
|
|
state,
|
|
rewrite ih
|
|
end
|