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Talk:Open and closed maps

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This is an old revision of this page, as edited by HyDeckar (talk | contribs) at 01:14, 4 July 2007. The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Sufficient for continuity?

Regarding "...a function f : X → Y is continuous...if the preimage of every closed set of Y is closed in X." at the end of the second paragraph:

Forgive me if I'm mistaken, but in general, preimages of closed sets being closed does not ensure continuity. E.g. for f: [0,1] -> (0,1] where f(x) = x (for x != 0) and f(0) = 1/2, f is not continuous. Perhaps something is assumed that I missed? 203.150.100.189 08:38, 20 March 2007 (UTC)[reply]

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