Require Export ZArith. Require Export ZArith_dec. Require Export Zdiv. Theorem Znotzero : (x:Z){`x<>0`}+{`x=0`}. Proof. Intro x. Elim (Z_eq_dec x `0`) ; Auto. Save.
Require
Export
Theorem Znotzero : (x:Z){`x<>0`}+{`x=0`}. Proof. Intro x. Elim (Z_eq_dec x `0`) ; Auto. Save.
Theorem
Proof
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