plus_n_O: forall n : nat, n = n + 0 (use "About" for full details on implicit arguments) plus_O_n: forall n : nat, 0 + n = n (use "About" for full details on implicit arguments) h: n = newdef n (use "About" for full details on implicit arguments) h: n = newdef n (use "About" for full details on implicit arguments) h: n = newdef n (use "About" for full details on implicit arguments)