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seen May 25 at 11:59

Sep
18
awarded  Nice Answer
Jun
25
awarded  Yearling
Jun
25
awarded  Suffrage
Mar
6
awarded  Nice Answer
May
28
awarded  Nice Answer
May
9
comment Examples of common false beliefs in mathematics
@Junyan Xu : Thanks, I corrected it.
May
9
revised Examples of common false beliefs in mathematics
Typo corrected
Apr
3
awarded  Yearling
Nov
7
comment Article about partitions with forbidden parts/multiplicities
Thank you, the last two articles are exactly what I was looking for. I appreciate your useful summaries that makes me recognize them immediately. I also appreciate your other links.
Nov
7
awarded  Scholar
Nov
7
accepted Article about partitions with forbidden parts/multiplicities
Nov
5
asked Article about partitions with forbidden parts/multiplicities
Oct
31
comment How to isolate $f(x)$ in $f(x+a)=f(x)+a\times g(x)$?
You are actually trying to calculate the indefinite sum of terms defined by $f$ (just look at the case $a=1$), so you really should narrow down the class of functions to have summation algorithms.
Oct
31
revised Two rectangular parallelepiped
fixed to be correct for non-rectangular parallelepipeds
Oct
31
comment Two rectangular parallelepiped
@David Eppstein: What you write is absolutely correct, but note that in the OP we had rectangular parallelepipeds, so I mentioned the number of vertices to indicate that it is not necessary to think more about this in this case. Sorry for being both too lazy to repeat the word "rectangular" and to give the more general argument. I don't like the English term "rectangular parallelepiped".
Oct
31
answered Two rectangular parallelepiped
Jun
9
awarded  Nice Answer
May
3
awarded  Necromancer
May
1
comment The first eigenvalue of a graph - what does it reflect?
They can also be the eigenvalues of the Laplacian of the graph.
May
1
comment The first eigenvalue of a graph - what does it reflect?
The largest eigenvalue of which matrix?