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Diffstat (limited to 'theories/Numbers/Natural/Abstract/NMinus.v')
-rw-r--r-- | theories/Numbers/Natural/Abstract/NMinus.v | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/theories/Numbers/Natural/Abstract/NMinus.v b/theories/Numbers/Natural/Abstract/NMinus.v index 07fc67499..5ac1f70fb 100644 --- a/theories/Numbers/Natural/Abstract/NMinus.v +++ b/theories/Numbers/Natural/Abstract/NMinus.v @@ -2,7 +2,11 @@ Require Export NTimesOrder. Module NMinusPropFunct (Import NAxiomsMod : NAxiomsSig). Module Export NTimesOrderPropMod := NTimesOrderPropFunct NAxiomsMod. -Open Local Scope NatIntScope. +Open Local Scope NatScope. + +Theorem minus_wd : + forall n1 n2 : N, n1 == n2 -> forall m1 m2 : N, m1 == m2 -> n1 - m1 == n2 - m2. +Proof NZminus_wd. Theorem minus_0_r : forall n : N, n - 0 == n. Proof NZminus_0_r. |