Quique Ruiz
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 Jan 12 accepted Does a closed subset $E$ of $X\times X$ induce a closed quotient map $X\rightarrow X/E$? Jan 12 revised Does a closed subset $E$ of $X\times X$ induce a closed quotient map $X\rightarrow X/E$? added 12 characters in body Jan 12 revised Does a closed subset $E$ of $X\times X$ induce a closed quotient map $X\rightarrow X/E$? added 22 characters in body Jan 12 asked Does a closed subset $E$ of $X\times X$ induce a closed quotient map $X\rightarrow X/E$? Dec 23 accepted Is the product of second category spaces second category? Dec 19 comment Is the product of second category spaces second category? Could you please write them anyway. Dec 18 asked Is the product of second category spaces second category? Jul 7 comment Closed Compact Subset of Product Space Must Have Empty Interior This implies that the assumption that $K$ is closed is not necessary. Jun 28 accepted Subadditivity inequality and power functions Jun 28 comment The boundary of a closed subset $A$ of a compact connected hausdorff space Duh for me. I missed that. Thanks. Jun 28 accepted The boundary of a closed subset $A$ of a compact connected hausdorff space Jun 27 comment The boundary of a closed subset $A$ of a compact connected hausdorff space To prove that second lemma, he uses the first lemma, but I'm having trouble seeing why $C\cap B=\emptyset$ in the if part of that first lemma. In that lemma, the first one, $K$ is a compact subset of $X$, which is Hausdorff, and $B$ is $\partial K$ in $X$. In my question $X$ is Hausdorff, and compact and connected. If my $X$ is Hausdorff too, $A$ is compact too (because $A$ is closed in a compact) and my $C$ is a component of $A$, why there, in the if part of the first lemma, $C\cap\partial A=\emptyset$, but you prove that $C\cap\partial A\neq\emptyset$. What is going on?! Jun 26 revised The boundary of a closed subset $A$ of a compact connected hausdorff space deleted 2 characters in body Jun 25 revised The boundary of a closed subset $A$ of a compact connected hausdorff space added 3 characters in body Jun 25 asked The boundary of a closed subset $A$ of a compact connected hausdorff space Jun 12 accepted $\mathbb{I}\times\mathbb{Q}\cup\mathbb{Q}\times\mathbb{I}$ and connectedness Jun 12 comment $\mathbb{I}\times\mathbb{Q}\cup\mathbb{Q}\times\mathbb{I}$ and connectedness Sorry for not being clear. I've just edited my question in order to be clear. Jun 12 revised $\mathbb{I}\times\mathbb{Q}\cup\mathbb{Q}\times\mathbb{I}$ and connectedness added 175 characters in body Jun 12 asked $\mathbb{I}\times\mathbb{Q}\cup\mathbb{Q}\times\mathbb{I}$ and connectedness Jun 1 comment Showing one point compactification is unique up to homeomorphism @BrianM.Scott, great! Very nice of you, by the way.