User Shahab - Mathematics Stack Exchange

bio	website	notesonmathematics.wordpress.…
	location	India
	age	29
visits	member for	2 years
	seen	39 mins ago
stats	profile views	384

	2,372 reputation	bio	website	notesonmathematics.wordpress.…	visits	member for	2 years
622 badges		location	India		seen	39 mins ago

1

13

votes

5

answers

454

views

A symmetric matrix whose square is zero

linear-algebra matrices

apr 12 at 10:09 Dominic Michaelis 11.8k

3

13

votes

2

answers

688

views

Automorphisms of the Petersen graph

combinatorics graph-theory

may 18 '11 at 17:44 Shahab 2,372

1

12

votes

2

answers

195

views

When is $(p - 1)! + 1$ a power of $p$?

number-theory elementary-number-theory

feb 4 at 6:55 user17762 76.1k

2

8

votes

3

answers

307

views

The aim in a course of differential equations?

differential-equations math-history

sep 20 at 16:46 mick 1,338

4

8

votes

1

answer

301

views

Szemerédi's Regularity Lemma

graph-theory

jul 26 at 22:50 Shahab 2,372

1

6

votes

2

answers

61

views

Importance of construction of polygons

geometry geometric-construction polygons

apr 13 at 17:46 J. M. 38.9k

2

6

votes

1

answer

424

views

Proof for Heine Borel theorem

real-analysis graph-theory

aug 31 at 18:28 Brian M. Scott 154k

6

votes

0

answers

84

views

van der Waerden's original proof

reference-request ramsey-theory

aug 29 at 15:01 Shahab 2,372

1

6

votes

2

answers

257

views

Proof of the van der Waerden theorem

combinatorics number-theory ramsey-theory

jun 2 '12 at 9:45 Ewan Delanoy 8,393

1

6

votes

1

answer

263

views

Showing that $K_7$ contains at least 4 monochromatic triangles

graph-theory ramsey-theory

feb 17 '12 at 5:05 Gerry Myerson 85.8k

5

votes

2

answers

124

views

When is the group of units in $\mathbb{Z}_n$ cyclic?

group-theory number-theory finite-groups

apr 26 at 19:44 m. k. 7,307

5

votes

2

answers

104

views

Prove that the product of primes in some subset of $n+1$ integers is a perfect square.

elementary-number-theory pigeonhole-principle

apr 26 at 4:27 Alexander Gruber 15.1k

5

votes

1

answer

54

views

Euler's proof for the infinitude of the primes

real-analysis prime-numbers euler-product

apr 8 at 7:13 Hurkyl 21.5k

3

5

votes

3

answers

397

views

Eigenvalues of a bipartite graph

linear-algebra graph-theory spectral-graph-theory

dec 4 at 11:57 Colin McQuillan 3,062

5

votes

1

answer

190

views

An upper bound for a graph Ramsey number

combinatorics graph-theory ramsey-theory

nov 30 at 9:33 Andrew Uzzell 844

5

votes

3

answers

293

views

$\tbinom{2p}{p}-2$ is divisible by $p^3$

combinatorics elementary-number-theory

jul 15 at 17:49 lab bhattacharjee 28.6k

1

5

votes

2

answers

117

views

Number of combinatorial progressions

combinatorics sequences-and-series

may 23 '12 at 12:57 Shahab 2,372

4

votes

1

answer

48

views

Dihedral group as a matrix group

group-theory finite-groups permutation-groups dihedral-groups

apr 24 at 14:09 DonAntonio 46.7k

4

votes

1

answer

52

views

Infinite distributive law

sequences-and-series summation

apr 12 at 17:52 Andres Caicedo 24.4k

4

votes

3

answers

36

views

Is $PGL_2(q)$ isomorphic to $SL_2(q)$

group-theory finite-groups

mar 31 at 15:00 Steve 3,031

2

4

votes

0

answers

86

views

A doubt in the proof of Frucht's theorem

abstract-algebra graph-theory finite-groups

mar 16 at 2:47 Shahab 2,372

1

4

votes

2

answers

108

views

Guaranteeing an integer lattice point centroid

combinatorics integer-lattices ramsey-theory pigeonhole-principle

mar 14 at 12:20 Martin Sleziak 20.3k

4

votes

1

answer

48

views

A group and an associated digraph

graph-theory algebraic-graph-theory

dec 11 at 16:22 Berci 20.6k

1

4

votes

1

answer

94

views

Triangle free graphs with large chromatic number

combinatorics graph-theory coloring

dec 7 at 11:04 Andrew Uzzell 844

4

votes

2

answers

164

views

Proving a metric space to be compact

general-topology metric-spaces compactness

jul 8 at 11:03 Davide Giraudo 56.2k

4

votes

3

answers

125

views

Erdős Probabilistic method

probability combinatorics ramsey-theory

may 22 '12 at 14:12 Shahab 2,372

2

4

votes

4

answers

245

views

Determinant of a special $0$-$1$ matrix

linear-algebra determinant

dec 30 '11 at 13:08 J. M. 38.9k

4

votes

1

answer

326

views

Ramsey number for books

combinatorics graph-theory ramsey-theory

dec 20 '11 at 1:02 Brian M. Scott 154k

4

votes

1

answer

108

views

Edge coloring a graph to find a monochromatic $K_{2,n}$

graph-theory ramsey-theory

aug 13 '11 at 4:33 Austin Mohr 11.6k

1

3

votes

2

answers

65

views

Applications of design theory

reference-request combinatorial-designs

may 13 at 14:42 Douglas S. Stones 11.2k

Shahab

103 Questions