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Diffstat (limited to 'lib/Integers.v')
| -rw-r--r-- | lib/Integers.v | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/Integers.v b/lib/Integers.v index c54b6fe5..625973a0 100644 --- a/lib/Integers.v +++ b/lib/Integers.v @@ -871,6 +871,13 @@ Proof. apply neg_mul_distr_l. Qed. +Theorem mul_signed: + forall x y, mul x y = repr (signed x * signed y). +Proof. + intros; unfold mul. apply eqm_samerepr. + apply eqm_mult; apply eqm_sym; apply eqm_signed_unsigned. +Qed. + (** ** Properties of binary decompositions *) Lemma Z_shift_add_bin_decomp: |