Timeline for Why is a topology made up of 'open' sets?
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| Jun 27, 2011 at 14:15 | history | made wiki | Post Made Community Wiki | ||
| Mar 25, 2010 at 0:20 | comment | added | Elizabeth S. Q. Goodman | For the definition of "infinitely close" (or the way I would define "touches"), I prefer continuous functions: wherever the set goes, that point goes with it. (So a closed set is one that can go to a point without dragging more points with it--but that requires a tautological definition of continuity again.) | |
| Mar 24, 2010 at 0:12 | history | answered | Michael Benfield | CC BY-SA 2.5 |