Timeline for Subsets of reals which are both $F_{\sigma\delta}$ and $G_{\delta\sigma}$
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 26, 2019 at 20:57 | vote | accept | D.S. Lipham | ||
| Aug 25, 2019 at 15:24 | comment | added | LSpice | Since yes-or-no questions sometimes are edited in ways that make yes-or-no answers hard to understand: this answer means "no, there need not be a non-empty open subset of $X$ that is $F_\sigma$ or $G_\delta$ in $\mathbb R$." | |
| Aug 25, 2019 at 3:59 | history | edited | Bjørn Kjos-Hanssen | CC BY-SA 4.0 |
deleted 102 characters in body
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| Aug 25, 2019 at 3:57 | history | undeleted | Bjørn Kjos-Hanssen | ||
| Aug 25, 2019 at 3:36 | history | deleted | Bjørn Kjos-Hanssen | via Vote | |
| Aug 25, 2019 at 3:36 | history | answered | Bjørn Kjos-Hanssen | CC BY-SA 4.0 |