Topology Atlas Document # paca-12

De Morgan in general and choice

Henno Brandsma

a note in Topology Explained
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We answer this question: ``How do you prove de Morgan's laws for arbitrary unions and intersections? It is tempting to use proof by induction but what about the uncountable case? Also, does this have any Relation to the axiom of choice?''

Date: November 15, 2003


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