Problem Set 2: Solutions Math 201A Fall 2016 Problem 1 ...
The collection Csatis es the axioms for closed sets in a topological space: (1) ;;R 2C. (2) The intersection of closed sets is closed, since either every set is R and the intersection is R, or at least one set is countable and the intersection in countable, since any subset of a countable set is countable. (3) A nite union of closed sets is closed,
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