diff options
author | letouzey <letouzey@85f007b7-540e-0410-9357-904b9bb8a0f7> | 2011-06-20 17:18:56 +0000 |
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committer | letouzey <letouzey@85f007b7-540e-0410-9357-904b9bb8a0f7> | 2011-06-20 17:18:56 +0000 |
commit | 580539fce36067d7c6ee89cbcb8707fd29ebc117 (patch) | |
tree | ac6a0c7d0a42643858e56598b5d0c690e9c88729 /theories/Numbers/NatInt | |
parent | c251e659c18859d0d8522781ff9d95723b253c11 (diff) |
Some migration of results from BinInt to Numbers
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@14230 85f007b7-540e-0410-9357-904b9bb8a0f7
Diffstat (limited to 'theories/Numbers/NatInt')
-rw-r--r-- | theories/Numbers/NatInt/NZAdd.v | 10 | ||||
-rw-r--r-- | theories/Numbers/NatInt/NZMul.v | 5 | ||||
-rw-r--r-- | theories/Numbers/NatInt/NZMulOrder.v | 6 |
3 files changed, 21 insertions, 0 deletions
diff --git a/theories/Numbers/NatInt/NZAdd.v b/theories/Numbers/NatInt/NZAdd.v index 202875b8a..8bed3027f 100644 --- a/theories/Numbers/NatInt/NZAdd.v +++ b/theories/Numbers/NatInt/NZAdd.v @@ -30,6 +30,11 @@ intros n m; nzinduct n. now nzsimpl. intro. nzsimpl. now rewrite succ_inj_wd. Qed. +Theorem add_succ_comm : forall n m, S n + m == n + S m. +Proof. +intros n m. now rewrite add_succ_r, add_succ_l. +Qed. + Hint Rewrite add_0_r add_succ_r : nz. Theorem add_comm : forall n m, n + m == m + n. @@ -82,6 +87,11 @@ Proof. intros n m p q. rewrite (add_comm p). apply add_shuffle1. Qed. +Theorem add_shuffle3 : forall n m p, n + (m + p) == m + (n + p). +Proof. +intros n m p. now rewrite add_comm, <- add_assoc, (add_comm p). +Qed. + Theorem sub_1_r : forall n, n - 1 == P n. Proof. intro n; now nzsimpl'. diff --git a/theories/Numbers/NatInt/NZMul.v b/theories/Numbers/NatInt/NZMul.v index 33c50b24e..2b5a1cf33 100644 --- a/theories/Numbers/NatInt/NZMul.v +++ b/theories/Numbers/NatInt/NZMul.v @@ -81,4 +81,9 @@ Proof. intros n m p q. rewrite (mul_comm p). apply mul_shuffle1. Qed. +Theorem mul_shuffle3 : forall n m p, n * (m * p) == m * (n * p). +Proof. +intros n m p. now rewrite mul_assoc, (mul_comm n), mul_assoc. +Qed. + End NZMulProp. diff --git a/theories/Numbers/NatInt/NZMulOrder.v b/theories/Numbers/NatInt/NZMulOrder.v index 7061dddcd..30a475aea 100644 --- a/theories/Numbers/NatInt/NZMulOrder.v +++ b/theories/Numbers/NatInt/NZMulOrder.v @@ -241,6 +241,12 @@ intros n m H1 H2; apply eq_mul_0 in H1. destruct H1 as [H1 | H1]. false_hyp H1 H2. assumption. Qed. +(** Some alternative names: *) + +Definition mul_eq_0 := eq_mul_0. +Definition mul_eq_0_l := eq_mul_0_l. +Definition mul_eq_0_r := eq_mul_0_r. + Theorem lt_0_mul : forall n m, 0 < n * m <-> (0 < n /\ 0 < m) \/ (m < 0 /\ n < 0). Proof. intros n m; split; [intro H | intros [[H1 H2] | [H1 H2]]]. |