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Jan
14
answered If the $81$ digit number $111\cdots 1$ is divided by $729$, the remainder is?
Jan
13
accepted Computational Topology and Lie Group Theory
Jan
13
comment Computational Topology and Lie Group Theory
@PeterFranek There's also "Elementary Applied Topology" by R. Ghrist.
Jan
12
comment Computational Topology and Lie Group Theory
I'm not working right now because of a serious (but hopefully in remission) illness so I've plenty of time on my hands. I've always wanted to study math more seriously.
Jan
12
asked Computational Topology and Lie Group Theory
Jan
10
comment Finding the inverse of $H-G E^{-1}F$
@Vim $M/E = H-G E^{-1}F$ appears in the "partitioned inverse formula" which gives the inverse of a partitioned matrix, so I thought it was always invertible and I didn't even look for easy counterexamples. The theorem just says "assume $E$ and $H$ are invertible".
Jan
10
asked Finding the inverse of $H-G E^{-1}F$
Dec
31
awarded  Commentator
Dec
31
accepted Monochromatic cycle in graph
Dec
31
comment Monochromatic cycle in graph
The only result I figured out on my own is lemma 3.1! I'd have never solved this "riddle" on my own.
Dec
31
comment Monochromatic cycle in graph
@GregoryJ.Puleo I don't know any theory about these things so I tried to prove it from scratch (it's a riddle I found somewhere). I know there are at least 14 edges of the same color and if those connect only 6 vertices then we can certainly find a cycle of length 6. But if the 14 edges connect 7 or 8 vertices things get complicated. After a while I gave up.
Dec
31
revised Monochromatic cycle in graph
added 100 characters in body
Dec
31
asked Monochromatic cycle in graph
Dec
15
comment Lattice Paths with no more than k consecutive steps
Keep in mind the generalized inclusion exclusion principle. It might help you with your problem.
Dec
15
revised How would you show that $Ax=b$ has a solution $\iff \text{rank } A = \text{rank } [A\, b]$?
added 9 characters in body
Dec
15
answered How would you show that $Ax=b$ has a solution $\iff \text{rank } A = \text{rank } [A\, b]$?
Nov
25
revised Minimization of Expected Value
added reference to book
Nov
25
awarded  Teacher
Nov
25
accepted Minimization of Expected Value
Nov
25
answered Minimization of Expected Value