User Shahrooz

52 votes

Conway's lesser-known results

answered Apr 12, 2020 at 21:45

28 votes

Not especially famous, long-open problems which anyone can understand

answered Jun 22, 2012 at 21:50

20 votes

Where is number theory used in the rest of mathematics?

answered Mar 9, 2012 at 19:10

13 votes

Will quantum computing kill cryptography ?

answered Apr 20, 2013 at 19:34

11 votes

Virus community spread mathematical modeling

answered Mar 15, 2020 at 13:30

9 votes

Relevant mathematics to the recent coronavirus outbreak

answered Mar 14, 2020 at 18:45

9 votes

Accepted

Characterization of non-isomorphic graphs but isomorphic total graphs?

answered Jan 30, 2016 at 23:21

8 votes

How many solutions does $\frac{1}{x_1}+\frac{1}{x_2}+\cdots +\frac{1}{x_n}=1$ have?

answered Jan 28, 2016 at 12:55

8 votes

Tutte's conjecture on Petersen graphs

answered Jun 13, 2017 at 6:18

8 votes

Does the Alternating group of degree $n>7$ have exactly one irreducible character of degree $n-1$?

answered Nov 9, 2013 at 21:25

7 votes

Math books for advanced high school students

answered Nov 5, 2014 at 13:52

7 votes

Accepted

How many triangles can a connected graph with $n$ vertices and $m$ edges have?

answered Jun 26, 2015 at 11:33

7 votes

References: spectral analysis of the Laplacian operator

answered Jun 15, 2017 at 23:04

7 votes

Integral $\int_0^1 \int_0^1 \cdots \int_0^1\frac{x_{1}^2+x_{2}^2+\cdots+x_{n}^2}{x_{1}+x_{2}+\cdots+x_{n}}dx_{1}\, dx_{2}\cdots \, dx_{n}=?$

answered Dec 10, 2017 at 14:29

6 votes

Is it possible that both a graph and its complement have small connectivity?

answered Oct 2, 2018 at 10:56

6 votes

$p$-groups in which all normal abelian subgroups are cyclic

answered Dec 1, 2017 at 8:42

6 votes

An algebraic graph theory problem?

answered Apr 14, 2016 at 9:29

6 votes

How might M.C. Escher have designed his patterns?

answered Jan 2, 2012 at 19:41

5 votes

What are the major open problems in design theory nowaday?

answered Jan 10, 2013 at 20:10

5 votes

Important formulas in combinatorics

answered Aug 17, 2015 at 18:49

5 votes

Accepted

Effects of many degree-2 variable nodes in the Tanner graph during the decoding of LDPC codes

answered Aug 23, 2015 at 7:05

5 votes

How to quantify the error correction capacity of LDPC code?

answered Jan 15, 2017 at 7:32

5 votes

Existence of special graph

answered May 19, 2016 at 17:27

5 votes

Roots of a polynomial inside the unit circle

answered Jan 29, 2018 at 14:36

5 votes

Linear algebra underlying quantum entanglement?

answered Mar 5, 2020 at 22:12

4 votes

Accepted

diameter of Cayley graphs

answered Jan 7, 2016 at 21:40

4 votes

Accepted

reverse definition for magic square

answered Jan 16, 2016 at 11:11

4 votes

Open problems with monetary rewards

answered Dec 17, 2014 at 18:07

4 votes

How networks with high largest eigenvalues are more robust?

answered Jun 14, 2015 at 8:55

4 votes

Accepted

normalized laplacian spectrum of trees

answered Sep 29, 2013 at 8:35

Stack Exchange Network

73 Answers

Conway's lesser-known results

Not especially famous, long-open problems which anyone can understand

Where is number theory used in the rest of mathematics?

Will quantum computing kill cryptography ?

Virus community spread mathematical modeling

Relevant mathematics to the recent coronavirus outbreak

Characterization of non-isomorphic graphs but isomorphic total graphs?

How many solutions does $\frac{1}{x_1}+\frac{1}{x_2}+\cdots +\frac{1}{x_n}=1$ have?

Tutte's conjecture on Petersen graphs

Does the Alternating group of degree $n>7$ have exactly one irreducible character of degree $n-1$?

Math books for advanced high school students

How many triangles can a connected graph with $n$ vertices and $m$ edges have?

References: spectral analysis of the Laplacian operator

Integral $\int_0^1 \int_0^1 \cdots \int_0^1\frac{x_{1}^2+x_{2}^2+\cdots+x_{n}^2}{x_{1}+x_{2}+\cdots+x_{n}}dx_{1}\, dx_{2}\cdots \, dx_{n}=?$

Is it possible that both a graph and its complement have small connectivity?

$p$-groups in which all normal abelian subgroups are cyclic

An algebraic graph theory problem?

How might M.C. Escher have designed his patterns?

What are the major open problems in design theory nowaday?

Important formulas in combinatorics

Effects of many degree-2 variable nodes in the Tanner graph during the decoding of LDPC codes

How to quantify the error correction capacity of LDPC code?

Existence of special graph

Roots of a polynomial inside the unit circle

Linear algebra underlying quantum entanglement?

diameter of Cayley graphs

reverse definition for magic square

Open problems with monetary rewards

How networks with high largest eigenvalues are more robust?

normalized laplacian spectrum of trees