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12 January, 16:39

Proposition 2.30. Suppose X and Y are topological spaces, and f : X → Y is any map. (a) f is continuous if and only if f (A c f (A) for all ASX. (b) f is closed if and only if f (A) 2 f (A) for all A CX. (c) f is continuous if and only if f - (Int B) Intf-? (B) for all B CY. (d) f is open if and only if f-' (Int B) 2 Int f-' (B) for all B C Y.

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  1. 12 January, 16:45
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