David Roberson

Member for 13 years, 1 month
Last seen more than a week ago

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Copenhagen, Denmark

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94/100 score

24/20 answers

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25

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Answers

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10

Computer program for counting graph homomorphisms

Jun 20, 2018

9

Spectrum of orthogonality graph (2)

Mar 9, 2018

9

Finite sets of vectors closed under an orthogonality property

Oct 23, 2015

8

Graph homomorphisms and line graph

Oct 15, 2015

7

Projective graphs

Feb 1, 2019

Questions

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13

Classical (i.e. commutative) spaces with quantum symmetry but no classical symmetry

Mar 4

11

Correspondence between matrix multiplication and a graph operation of Lovász

Jun 29, 2019

10

Cospectral mate of rhombic dodecahedron

Apr 28, 2017

8

Has anyone seen this graph?

Oct 18, 2011

8

Does there exist a nontrivial perfect group with a "locally commuting" presentation?

Mar 24, 2021

Tags

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graph-theory

94

Score

39

posts

co.combinatorics

38

Score

27

posts

spectral-graph-theory

20

Score

7

posts

linear-algebra

18

Score

8

posts

graph-colorings

18

Score

6

posts

Reputation

+10

Finite sets of vectors closed under an orthogonality property

+10

Classical (i.e. commutative) spaces with quantum symmetry but no classical symmetry

+10

Positive-semidefiniteness of Laplacian of signed graph

+10

Computer program for counting graph homomorphisms

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