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user19906
  • Member for 11 years, 1 month
  • Last seen more than a month ago
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question
27
Algebraic proof of Five-Color Theorem using chromatic polynomials by Birkhoff and Lewis in 1946
May 11, 2015
question
4
reference request: voltage in a resistor network is a unique harmonic function
Oct 1, 2016
question
-3
How does deletion-contraction affect chromatic number? Can it increase chromatic number? [closed]
May 22, 2015
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48
Word origin / meaning of 'kernel' in linear algebra
30
How to write Stirling numbers of the second kind?
21
If $A$ and $B$ are positive definite, then is $B^{-1} - A^{-1}$ positive semidefinite?
19
Kleinberg-Tardos style of book writing
19
Connecting from in the middle of |- line