Felix Goldberg's user avatar
Felix Goldberg's user avatar
Felix Goldberg's user avatar
Felix Goldberg
  • Member for 12 years
  • Last seen more than a week ago
1 vote

Eigenvalues of directed Laplacian matrix $L$ and $DL$, where $D$ is a diagonal matrix with positive entries

1 vote

Which directed graphs have a normal adjacency matrix?

1 vote

Number of bases of a matroid

2 votes

Rank changes with matrix edits

2 votes

Which popular games are the most mathematical?

15 votes

Sherman-Morrison type formula for Moore-Penrose pseudoinverse

2 votes

Lower bounds for the singular values of submatrices of othogonal matrices

1 vote

Rank adjacency matrix bipartite graph

10 votes

Upper bounds on eigenvalues of PSD matrix?

1 vote

Generalizing the spectral radius of a unistochastic matrix

5 votes
Accepted

eigenvalue estimate of the adjacency matrix

5 votes

A conjecture about strongly regular graphs

0 votes

Isomorphism testing in STS(13)

4 votes

NP-hard problems in linear algebra and real analysis

1 vote

derivative of the dominant eigenvalue

10 votes

Silly me & Van der Waerden conjecture

2 votes
Accepted

Bound on smallest entry of inverse matrix

0 votes

Spectral radius of a proper subgraph

1 vote

How to write this result (successive Schur complements compose nicely)

1 vote

Does the notion of graphs with vertex multiplicity exist?

1 vote

Graph where non-adjacent vertices share a common neighbor?

0 votes

Eigenvalues of permutations of a real matrix: can they all be real?

0 votes

Reference (or proof) for the following identity in Linear Algebra

1 vote

When can a matrix with negative entries have a completely non-negative dominant eigenvector?

2 votes

Lower bounds on cardinality of a union of blocks in a design

3 votes

Almost-converses to the AM-GM inequality

1 vote

How to identify bridge nodes between nearly connected graph components in partitioned adjacency matrices?

0 votes

Pairwise balanced designs with $r=\lambda^{2}$

4 votes
Accepted

Linear maps preserving positive semidefiniteness

1 vote

Eigenvalues of a special block matrix associated with strongly connected graph