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# Questions

2
0
75
views

### Distinct eigenvalues of the quadratic eigenvalue problem

jan 15 at 15:19 Felix Goldberg 2,385512

2
1
99
views

### Is Ryser’s conjecture on permanent minimizers still open?

apr 25 at 23:17 Ian Wanless 411

2
1
39
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### Lower bounds on cardinality of a union of blocks in a design

may 1 at 17:16 Felix Goldberg 2,385512

2
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126
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### If a graph invariant is NP-Hard, is its “deck ratio” NP-Hard as well?

jan 11 at 14:45 Felix Goldberg 2,385512

2
1
190
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### How random are random spanning trees?

jan 28 at 1:34 Aaron Meyerowitz 11.6k11031

1
2
2
208
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### Motivation for Frankl’s conjecture?

2d ago Russ Woodroofe 691146

1
vote
0
34
views

### Which matrix/operator in a cone has the smallest negative spectral part?

may 4 at 12:36 Felix Goldberg 2,385512

1
vote
2
81
views

### Incidence matrices of generalized quadrangles

may 13 at 12:45 John Bamberg 1936

1
vote
0
46
views

### Toroidality testing

jan 21 at 17:22 Felix Goldberg 2,385512

1
vote
5