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replaced http://mathoverflow.net/ with https://mathoverflow.net/

edited Apr 13, 2017 at 12:58

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F for a closed set comes from the French ferme (=firm, cf. fermer=to close).

What about G for an open set? Is this also an example of the next-letter phenomenon? (as in Michael's comment to this answer to the question.)

answered Dec 11, 2009 at 20:44

Konrad Swanepoel

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