How to use rewrite on a subexpression of the current goal
Using the tactic simpl works, but don't ask me why rewrite plus_comm or rewrite (plus_comm 3 4) doesn't work. apply is for implications, not equations.
Using the tactic simpl works, but don't ask me why rewrite plus_comm or rewrite (plus_comm 3 4) doesn't work. apply is for implications, not equations.