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kishlaya

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12 posts edited

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137 votes cast

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Votes Activity Newest Views Added

182

votes

31

answers

33k

views

Counterintuitive examples in probability

probability soft-question examples-counterexamples intuition big-list

Nov 16 at 12:29 MR_BD 5,031

145

votes

8

answers

24k

views

Intuition of the meaning of homology groups

general-topology soft-question algebraic-topology homology-cohomology

May 6 '19 at 10:24 Ronnie Brown 13.8k

77

votes

6

answers

6k

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Motivation for spectral graph theory.

linear-algebra graph-theory intuition spectral-graph-theory motivation

Mar 21 '16 at 18:57 Alexander Gruber♦ 25.8k

43

votes

2

answers

1k

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there exist infinite many $n\in\mathbb{N}$ such that $S_n-[S_n]<\frac{1}{n^2}$

number-theory inequality ceiling-and-floor-functions conjectures harmonic-numbers

Jan 20 '17 at 22:19 Community♦ 1

17

votes

1

answer

4k

views

Why does integral and the imaginary part commute?

integration complex-numbers

Feb 11 '17 at 17:28 kishlaya 1,195

11

votes

1

answer

484

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How to read Spectral Theory of Graphs

reference-request graph-theory book-recommendation spectral-graph-theory

May 16 '16 at 4:32 guest 4,527

5

votes

2

answers

2k

views

Normalizer of upper triangular group in ${\rm GL}(n,F)$

abstract-algebra group-theory alternative-proof

Jan 3 '19 at 10:12 Ken 1,373

4

votes

1

answer

188

views

How to solve this mathematical puzzle?

combinatorics puzzle pigeonhole-principle maxima-minima

Aug 21 '17 at 6:53 efei tony 1

3

votes

2

answers

908

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If $f(x,y)=f(y,x)$ then $\frac{\partial f(x,y)}{\partial x}=\frac{\partial f(y,x)}{\partial y}$

calculus proof-writing

Feb 8 '17 at 15:34 Adam Hughes 34k

3

votes

1

answer

522

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Not isomorphic graphs with same spectrum - exists?

matrices graph-theory eigenvalues-eigenvectors graph-isomorphism

Nov 8 '19 at 18:24 N. Osil 111

3

votes

1

answer

3k

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A path has only two vertices which are not cut-vertices

graph-theory

Nov 16 '12 at 0:47 Nikola Milinković 328

2

votes

1

answer

106

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If $G'$ is a subgraph of $G$, and there is a homomorphism to $G\to H$, then exists also $G'\to H$ for every subgraph?

logic graph-theory propositional-calculus

Jan 27 '20 at 19:12 Alex Kruckman 47.5k

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