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union idem used for comprehension

This commit is contained in:
Niels van der Weide 2017-10-11 17:11:07 +02:00
parent 0f44ee009b
commit 91899aef6f
1 changed files with 1 additions and 3 deletions
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4
FiniteSets/kuratowski/operations.v
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@ -54,9 +54,7 @@ Section operations.
- apply nl.
- apply nr.
- intros; simpl.
destruct (P x).
+ apply idem.
+ apply nl.
apply union_idem.
Defined.
Definition single_product {A B : Type} (a : A) : FSet B -> FSet (A * B).