include "nat/plus.ma".
+ntheorem boo:
+ ((λx.x = x) ?) → 0 = 0.
+##[ #H; nwhd in H ⊢ %; nauto by H.
+
ntheorem foo:
((λx.x + 0 = x) ?) →
((λx,y.x + S y = S (x + y)) ? ?) →
((λx,y.y + x = x + y) ? ?) →
∀x. ((λz. x + x = z + S z) ?).
-##[ #H; #H1; #H2; #x; nnormalize in H H1 H2 ⊢ %; nauto by H, H1, H2.
\ No newline at end of file
+##[ #H; #H1; #H2; #x; nwhd in H H1 H2 ⊢ %; nauto by H, H1, H2.
\ No newline at end of file