User Felix Goldberg

25

44

votes

3

answers

11k

views

The unreasonable effectiveness of Pade approximation

Oct 1 '17 at 2:09 jeq 1,220

9

18

votes

1

answer

3k

views

What have simplicial complexes ever done for graph theory?

co.combinatorics at.algebraic-topology graph-theory soft-question simplicial-complexes

Apr 14 '14 at 8:28 Gil Kalai 23.2k

2

13

votes

2

answers

829

views

Computing a large permanent

permanent linear-algebra na.numerical-analysis matrix-analysis

Apr 29 '13 at 17:23 Timothy Chow 55.1k

8

12

votes

4

answers

2k

views

What are the major open problems in design theory nowaday?

combinatorial-designs co.combinatorics open-problems

Jan 17 '14 at 6:17 Community♦ 1

4

11

votes

3

answers

736

views

How many isolated roots can a polynomial in $z$ and $\overline{z}$ have?

reference-request cv.complex-variables polynomials

Mar 26 '16 at 16:07 Alexandre Eremenko 67.6k

2

10

votes

5

answers

2k

views

Are all almost regular graphs obvious?

co.combinatorics graph-theory extremal-graph-theory regularity

May 28 '14 at 13:09 Douglas Zare 26.6k

2

10

votes

1

answer

423

views

Probability that a random distance function is metric

pr.probability matrices random-matrices metric-spaces

Apr 4 '14 at 16:04 Ricardo Andrade 5,998

2

9

votes

1

answer

386

views

Coherence between different ranking methods of a graph's vertices

co.combinatorics linear-algebra graph-theory spectral-graph-theory mathematical-modeling

Sep 2 '14 at 9:34 Aaron Meyerowitz 28k

1

8

votes

2

answers

1k

views

Motivation for Frankl's conjecture?

co.combinatorics hypergraph

May 12 '16 at 12:47 Russ Woodroofe 3,157

1

8

votes

1

answer

279

views

Spectral lower bounds on the diameter of a graph

co.combinatorics graph-theory spectral-graph-theory extremal-graph-theory

Oct 29 '14 at 16:17 Richard Zhang 550

3

8

votes

1

answer

534

views

Can the graph Laplacian be well approximated by a Laplace-Beltrami operator?

riemannian-geometry sp.spectral-theory manifolds spectral-graph-theory

Aug 31 '14 at 11:53 Community♦ 1

1

8

votes

1

answer

275

views

A conjecture about strongly regular graphs

co.combinatorics graph-theory spectral-graph-theory

Aug 20 '14 at 19:48 Felix Goldberg 6,270

1

7

votes

6

answers

2k

views

Efficient Hamiltonian cycle algorithms for graph classes

graph-theory algorithms computational-complexity cycles hamiltonian-graphs

Aug 11 '17 at 22:17 Community♦ 1

3

7

votes

1

answer

166

views

Least-squares solution of systems of Sylvester equations

matrices applications matrix-equations least-squares

Dec 9 '15 at 19:37 Robert Israel 50k

2

7

votes

1

answer

361

views

Full-rank factorization of the graph Laplacian

co.combinatorics graph-theory spectral-graph-theory

Oct 28 '14 at 12:32 Richard Zhang 550

3

7

votes

2

answers

9k

views

Cramer's rule for eigenvectors

linear-algebra

Apr 30 '14 at 19:48 Max Horn 4,148

3

7

votes

4

answers

2k

views

A generalization of Catalan numbers

catalan-numbers nt.number-theory co.combinatorics

Dec 4 '13 at 1:04 Sam Hopkins 14.4k

2

6

votes

1

answer

202

views

What is/are the best bound/s on the sum of squares of degrees in a graph?

reference-request co.combinatorics graph-theory

Feb 21 '14 at 16:47 Seva 19.9k

1

6

votes

1

answer

179

views

Hamiltonicity criteria for sparse graphs

co.combinatorics graph-theory extremal-graph-theory sparse-matrices hamiltonian-graphs

Jan 31 '14 at 10:04 Community♦ 1

1

6

votes

0

answers

246

views

Largest entry of the inverse matrix?

matrices linear-algebra

Feb 22 '13 at 21:03 Community♦ 1

6

votes

1

answer

322

views

Hamiltonian cycles in power-graphs

graph-theory hamiltonian-graphs

Jan 31 '13 at 14:22 Community♦ 1

6

votes

0

answers

1k

views

When is the inverse diagonally dominant?

matrix-analysis matrix-inverse

Sep 6 '12 at 14:19 Felix Goldberg 6,270

6

votes

0

answers

383

views

concentration for eigenvectors

linear-algebra matrices matrix-theory

May 26 '12 at 7:38 Felix Goldberg 6,270

5

votes

2

answers

235

views

Interlacing for “Almost Hermitian” matrices

linear-algebra matrices

Jul 20 '18 at 2:40 Cesar Aguilar 11

1

5

votes

1

answer

316

views

power laws emerging from the sandpile model

reference-request pr.probability mp.mathematical-physics st.statistics sandpile

Feb 7 '17 at 8:39 Nikita Kalinin 4,351

2

5

votes

1

answer

256

views

Duration and critical groups order in sandpile models and chip firing games

co.combinatorics gr.group-theory graph-theory combinatorial-game-theory sandpile

Aug 16 '14 at 6:02 Sam Hopkins 14.4k

4

5

votes

1

answer

477

views

What it is the volume of the unit ball section of the cone of positive definite matrices?

mg.metric-geometry matrices measure-theory convexity convex-optimization

May 2 '14 at 22:40 Robert Bryant 88.1k

2

5

votes

0

answers

121

views

Minimum of the product of linear forms over a lattice

nt.number-theory analytic-number-theory lattices

Nov 18 '13 at 19:36 Felix Goldberg 6,270

2

5

votes

1

answer

947

views

How many distinct eigenvalues does a random graph have?

random-graphs spectral-graph-theory linear-algebra graph-theory

Apr 22 '13 at 14:49 Terry Tao 81.6k

5

votes

2

answers

493

views

Perron Frobenius with one negative pair of entries

linear-algebra matrix-analysis

May 8 '12 at 11:53 Felix Goldberg 6,270

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133 Questions

The unreasonable effectiveness of Pade approximation

What have simplicial complexes ever done for graph theory?

Computing a large permanent

What are the major open problems in design theory nowaday?

How many isolated roots can a polynomial in $z$ and $\overline{z}$ have?

Are all almost regular graphs obvious?

Probability that a random distance function is metric

Coherence between different ranking methods of a graph's vertices

Motivation for Frankl's conjecture?

Spectral lower bounds on the diameter of a graph

Can the graph Laplacian be well approximated by a Laplace-Beltrami operator?

A conjecture about strongly regular graphs

Efficient Hamiltonian cycle algorithms for graph classes

Least-squares solution of systems of Sylvester equations

Full-rank factorization of the graph Laplacian

Cramer's rule for eigenvectors

A generalization of Catalan numbers

What is/are the best bound/s on the sum of squares of degrees in a graph?

Hamiltonicity criteria for sparse graphs

Largest entry of the inverse matrix?

Hamiltonian cycles in power-graphs

When is the inverse diagonally dominant?

concentration for eigenvectors

Interlacing for “Almost Hermitian” matrices

power laws emerging from the sandpile model

Duration and critical groups order in sandpile models and chip firing games

What it is the volume of the unit ball section of the cone of positive definite matrices?

Minimum of the product of linear forms over a lattice

How many distinct eigenvalues does a random graph have?

Perron Frobenius with one negative pair of entries