Timeline for Injective Function on a Dense Set
Current License: CC BY-SA 3.0
4 events
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| Aug 26, 2011 at 11:09 | comment | added | Joel David Hamkins | Another similar example to this would be to use a dense subset of the plane that contains at most one point from each column. (One can even make it countable by using only rational points.) Thus, the projection map of this set to the $x$-axis is injective, but extends by continuity to the full projection map of the plane to the $x$-axis. | |
| Aug 26, 2011 at 3:56 | comment | added | Tom Leinster | To answer your query, which I've now deleted, about getting the accent on Čech's name: on my computer (UK keyboard, Linux) it's done by typing AltGr-@ followed by C. | |
| Aug 26, 2011 at 3:53 | history | edited | Tom Leinster | CC BY-SA 3.0 |
Put accent on Čech's name
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| Aug 26, 2011 at 3:32 | history | answered | Andreas Blass | CC BY-SA 3.0 |