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 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?