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Clarified proof of notIn_ext_union_singleton

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Niels van der Weide 2017-10-11 17:45:37 +02:00
parent 91899aef6f
commit c6f756a856
1 changed files with 2 additions and 2 deletions
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2
FiniteSets/subobjects/b_finite.v
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@ -411,7 +411,7 @@ Section kfin_bfin.
destruct (dec (a = b)) as [Hb | Hb]; cbn.
* refine (Empty_rec _).
rewrite Hb in Ha.
contradiction.
apply (HYb Ha).
* reflexivity.
* destruct (dec (b = b)) ; [ reflexivity | contradiction ].
Defined.