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dharr
  • Member for 1 year, 7 months
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About

I am a retired chemistry professor, with interests in physical chemistry, especially electrochemistry. I also have interests in mathematics, especially matrices, and am a long-time user of Maple.

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Top posts

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7
Rank of adjacency matrix of a graph on a sphere all of whose faces have four vertices
Oct 13, 2024
7
Localization of eigenvalues on complex plane
Feb 28, 2025
4
Factorization of a parameter-dependent quintic polynomial arising from a photon-sphere equation
Jan 25
3
The relationship between a matrix and its coefficient matrix decomposed in Pauli matrix
Sep 22, 2024
3
Special determinant formula
Dec 24, 2024
3
How to prove positive definiteness of a matrix under given premises?
Oct 2, 2025
2
Eigenvalues of certain matrices
Sep 28, 2024
2
Binary matrices with constant column sum and full column rank
Jan 14, 2025
2
A question related to matrix inverse diagonal zero property
Nov 15, 2025
1
Graceful labeling of the complete bipartite graph and its laplacian quadratic form diagonalized
Aug 29, 2024

Top network posts

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10
Number of coordination isomers of a coordination compound
9
Is a pure copper cathode necessary in the electrolytic refining of copper?
7
Is the fastest relaxation peak in DRT real or a mathematical artifact?
6
Location of node in sp-hybrid orbital
6
Ruler-and-compass constructions