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David Roberson's user avatar
David Roberson's user avatar
David Roberson
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20 Questions

Score Activity Newest Views
11 votes
0 answers
508 views

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

8 votes
1 answer
354 views

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

4 votes
0 answers
104 views

Doubly stochastic matrices that remain doubly stochastic after conjugating by the character table of a finite abelian group

4 votes
1 answer
88 views

Strongly/distance regular graphs over $\mathbb{Z}_2^n$ with the same parameters

11 votes
1 answer
436 views

Correspondence between matrix multiplication and a graph operation of Lovász

8 votes
0 answers
149 views

Partial order on graphs induced by homomorphism counts

6 votes
1 answer
1k views

Vector chromatic number and Lovasz theta

4 votes
0 answers
277 views

Reference for results about planar graphs

3 votes
0 answers
126 views

Asymmetric graphs stable under 3-dimensional Weisfeiler-Leman

4 votes
1 answer
568 views

Smallest pair of non-isomorphic graphs equivalent under the Weisfeiler-Leman algorithm

4 votes
0 answers
297 views

For what (other) families of graphs does the clique-coclique bound hold?

4 votes
0 answers
141 views

Automorphisms of the modular product of graphs

10 votes
0 answers
219 views

Cospectral mate of rhombic dodecahedron

6 votes
1 answer
254 views

Has anyone seen this graph construction that is similar to the line graph?

5 votes
1 answer
488 views

When is the adjacency algebra of a graph an association scheme?

3 votes
0 answers
170 views

Question about circulants and association schemes

7 votes
1 answer
432 views

Can every trace preserving isomorphism of unital self-adjoint matrix algebras be realized as conjugation by a unitary?

6 votes
1 answer
513 views

Eigenvalue inequality for regular graphs

8 votes
1 answer
1k views

Has anyone seen this graph?

0 votes
0 answers
181 views

Question about majorization of eigenvalues after conjugation