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 Apr 13 accepted How to define math object which is not a set? Apr 9 awarded Popular Question Mar 28 revised How to define math object which is not a set? edited body Mar 28 revised How to define math object which is not a set? added 78 characters in body Mar 28 comment How to define math object which is not a set? @ iiivooo: So my new theory will need to extend the notion of union. Mar 28 asked How to define math object which is not a set? Mar 28 awarded Good Question Mar 25 awarded Nice Question Mar 14 awarded Notable Question Feb 27 awarded Yearling Feb 25 revised What is the value of　$\frac 1 {0! + 1! + 2!} +\frac 1 {1! + 2! + 3!} + \frac 1 { 2! + 3! + 4!} + …?$ edited title Feb 22 accepted Is $C[0,1]$ a manifold? Feb 20 accepted Show that $f$ is homotopic to $g$. Feb 17 revised Show that $f$ is homotopic to $g$. added 34 characters in body Feb 17 asked Show that $f$ is homotopic to $g$. Feb 17 accepted If $p, q \in \mathbb{R}^n$ and both $A$ and $B$ don't separate $p$ and $q$, then neither does $A\cup B$ Feb 16 asked If $p, q \in \mathbb{R}^n$ and both $A$ and $B$ don't separate $p$ and $q$, then neither does $A\cup B$ Dec 25 comment How do you find the value of $\sum_{r=1}^{\infty} \frac{6^r}{(3^r-2^r)(3^{r+1} - 2^{r+1})}$? @ Ashiish Gupta: Do you know partial fraction? Dec 5 awarded Popular Question Dec 4 comment Is there application of the set $\prod_{i\in\mathbb R}\mathbb R$? No, I would like to consider the cartesian product of $\mathbb R$