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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 $\mathbb R$