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https://math.stackexchange.com/questions/5133668/can-the-definition-of-a-t1-space-be-simplified general topology - Can the definition of a T1 space be simplified? - Mathematics Stack Exchange There are a number of equivalent definitions of a $T_1$ space, circling around the concept that: every singleton is a closed set for every pair of points, each... mathematics stack exchange general topology definition t1 space https://mathoverflow.net/questions/tagged/gn.general-topology?tab=newest&page=324&pagesize=15 Newest 'gn.general-topology' Questions - Page 324 - MathOverflow newest gn general topology questions 324 mathoverflow https://mathoverflow.net/search?q=user:3635+[gn.general-topology] Posts matching 'user:3635 [gn.general-topology]' - MathOverflow posts matching user gn general topology 3635 mathoverflow https://mathoverflow.net/questions/tagged/gn.general-topology?tab=newest&page=3&pagesize=15 Newest 'gn.general-topology' Questions - Page 3 - MathOverflow newest gn general topology questions 3 mathoverflow https://math.stackexchange.com/questions/tagged/general-topology Newest 'general-topology' Questions - Mathematics Stack Exchange general topology questions mathematics stack exchange newest https://mathoverflow.net/questions/tagged/gn.general-topology?tab=newest&page=4&pagesize=15 Newest 'gn.general-topology' Questions - Page 4 - MathOverflow newest gn general topology questions 4 mathoverflow https://mathoverflow.net/tags/gn.general-topology/info 'gn.general-topology' tag wiki - MathOverflow gn general topology tag wiki mathoverflow https://arxiv.org/list/math.GN/recent General Topology general topology https://mathoverflow.net/questions/243639/finitely-additive-measures-on-boolean-algebras-of-regular-open-subsets-is-there gn.general topology - Finitely additive measures on Boolean algebras of regular open subsets: Is... Let $\mathcal{X}$ be a topological space. An open subset $\mathcal{R}\subseteq\mathcal{X}$ is regular if it is the interior of its own closure. The... gn general topology additive measures boolean algebras https://math.stackexchange.com/questions/5134606/showing-that-there-is-no-immediate-deformation-retraction-to-a-point general topology - Showing that there is no immediate deformation retraction to a point -... Let $$X = \overline{B}_{n + 1},$$ $$C = \{x \in X: (\forall i \in (n + 1) \setminus \{0\}: x_i = 0) \land x_0 \geq 0\},$$ $$A = S_n \cup C,$$ where... general topology showing immediate deformation retraction https://mathoverflow.net/questions/tagged/gn.general-topology?tab=Frequent Frequent 'gn.general-topology' Questions - MathOverflow gn general topology questions mathoverflow frequent https://mathoverflow.net/questions/tagged/gn.general-topology?tab=newest&pagesize=15 Newest 'gn.general-topology' Questions - MathOverflow newest gn general topology questions mathoverflow https://mathoverflow.net/tags/gn.general-topology/topusers 'gn.general-topology' Top Users - MathOverflow gn general topology users mathoverflow https://mathoverflow.net/questions/510544/straightening-a-polygonal-arc-in-the-plane gn.general topology - Straightening a Polygonal Arc in the Plane - MathOverflow In preparation for a book, a friend and I are trying to cheat our way to the Schoenflies Theorem in $\mathbb{R}^2$ and we have a reduction which seems very... gn general topology straightening polygonal arc plane https://mathoverflow.net/tags/gn.general-topology/synonyms 'gn.general-topology' Tag Synonyms - MathOverflow gn general topology tag synonyms mathoverflow https://mathoverflow.net/questions/tagged/gn.general-topology?tab=Votes Highest scored 'gn.general-topology' questions - MathOverflow gn general topology highest scored questions mathoverflow https://mathoverflow.net/questions/tagged/gn.general-topology Newest 'gn.general-topology' Questions - MathOverflow newest gn general topology questions mathoverflow https://mathoverflow.net/questions/tagged/gn.general-topology?tab=Unanswered Unanswered 'gn.general-topology' Questions - MathOverflow gn general topology questions mathoverflow unanswered https://mathoverflow.net/search?q=user:554413+[gn.general-topology] Posts matching 'user:554413 [gn.general-topology]' - MathOverflow posts matching user gn general topology 554413 mathoverflow https://mathoverflow.net/questions/510590/who-coined-the-term-clopen gn.general topology - Who coined the term "clopen"? - MathOverflow I was not sure whether this question is appropriate for this forum, but a quick search suggests that there is at least some precedent for asking about the... gn general topology term clopen mathoverflow coined https://mathoverflow.net/questions/tagged/gn.general-topology?tab=newest&pagesize=50 Newest 'gn.general-topology' Questions - MathOverflow newest gn general topology questions mathoverflow https://www.cambridge.org/highereducation/books/general-topology-for-beginners/3BD5141C1821C6CF3A78BB2ECDC937D3 General Topology for Beginners | Cambridge Aspire website Discover General Topology for Beginners, 1st Edition, Jay Mehta on Cambridge Aspire website general topology cambridge aspire beginners https://mathoverflow.net/questions/tagged/gn.general-topology?tab=newest&pagesize=30 Newest 'gn.general-topology' Questions - MathOverflow newest gn general topology questions mathoverflow https://mathoverflow.net/questions/tagged/gn.general-topology?tab=Trending Trending 'gn.general-topology' questions - MathOverflow gn general topology questions mathoverflow trending https://mathoverflow.net/questions/510590/who-coined-the-term-clopen?noredirect=1 gn.general topology - Who coined the term "clopen"? - MathOverflow I was not sure whether this question is appropriate for this forum, but a quick search suggests that there is at least some precedent for asking about the... gn general topology term clopen mathoverflow coined https://mathoverflow.net/questions/509712/non-constant-maps-between-t-2-spaces gn.general topology - Non-constant maps between $T_2$-spaces - MathOverflow Are there $T_2$-spaces $X, Y$, each having more than $1$ point, such that every continuous map $f:X\to Y$ is constant, and every continuous map $g:Y\to X$ is... gn general topology spaces mathoverflow non constant maps https://mathoverflow.net/questions/tagged/gn.general-topology?tab=Newest Newest 'gn.general-topology' Questions - MathOverflow newest gn general topology questions mathoverflow https://mathoverflow.net/questions/tagged/gn.general-topology?tab=Month Most active 'gn.general-topology' questions - MathOverflow gn general topology questions mathoverflow active https://mathoverflow.net/questions/509638/isotopy-to-achieve-finite-intersections gn.general topology - Isotopy to achieve finite intersections - MathOverflow I've asked this question on math.stackexchange a week ago, with no response. More context is available there. Suppose that $\alpha$ and $\beta$ are closed... gn general topology achieve finite intersections mathoverflow https://mathoverflow.net/questions/504760/a-property-which-combines-total-paracompactness-and-strong-paracompactness gn.general topology - A property which combines total paracompactness and strong paracompactness -... Def 1. We call $X$ strongly paracompact if every open cover has a star-finite open refinement. Def 2. We call $X$ paracompact if every open cover has locally... gn general topology property combines total strong https://mathoverflow.net/questions/509206/is-the-complement-of-the-support-of-a-measure-on-a-topological-space-a-set-of-me gn.general topology - Is the complement of the support of a measure on a topological space a set of... $\DeclareMathOperator{\supp}{supp}$ Let $\mu$ be a (Borel) measure on a topological space $(X,T)$. By definition, for any $x \in \supp(\mu)^c$, it exists an... gn general topology complement support measure topological https://mathoverflow.net/questions/510532/topological-version-of-arzela-ascoli-theorem gn.general topology - Topological version of Arzela-Ascoli theorem? - MathOverflow Equip $C(X, Y)$ with compact-open topology. Theorem. (Arzela-Ascoli) If $X, Y$ are Hausdorff and $Y$ is a uniform space, $S\subseteq C(X, Y)$ is pointwise... gn general topology topological version ascoli theorem https://mathoverflow.net/questions/510052/is-the-countable-box-product-of-real-lines-a-%c4%8cech-complete-space gn.general topology - Is the countable box product of real lines a Čech-complete space? -... This answer by Henno Brandsma points to this article by Frolik, where it's shown that countable box products of countably complete spaces are countably... gn general topology box product countable real lines