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Apr
7
awarded  Nice Question
Apr
2
revised Involutions, RSK and Young Tableaux
added 80 characters in body
Apr
2
revised Involutions, RSK and Young Tableaux
edited body
Apr
2
revised Involutions, RSK and Young Tableaux
added 246 characters in body
Apr
2
revised Involutions, RSK and Young Tableaux
added 12 characters in body
Apr
2
revised Involutions, RSK and Young Tableaux
added 156 characters in body
Apr
2
revised Involutions, RSK and Young Tableaux
added 18 characters in body
Apr
2
asked Involutions, RSK and Young Tableaux
Apr
1
revised Non-Intersecting up-right lattice paths and standard Young Tableaux
added 32 characters in body
Mar
31
asked Non-Intersecting up-right lattice paths and standard Young Tableaux
Mar
26
revised Checksum Invariants for Matrix Inversion via Gaussian Elimination
edited body
Mar
26
comment Checksum Invariants for Matrix Inversion via Gaussian Elimination
E.g. $CA^{-1}=D$. That's embarrassingly easy. Thanks!
Mar
26
accepted Checksum Invariants for Matrix Inversion via Gaussian Elimination
Mar
26
revised Checksum Invariants for Matrix Inversion via Gaussian Elimination
edited title
Mar
26
asked Checksum Invariants for Matrix Inversion via Gaussian Elimination
Mar
20
answered show that $ϕ(n/d)=g(d)$ where $ g(d)=\# \{a \in \{1,\dots ,n\} | GCD(a,n)=d\}$
Mar
10
comment Conditionally convergent products
Hint: in the case it's rational, $e^{in\theta}$ will be $\pm 1$ infinitely often. Take logs of the product and look at a second order Taylor expansion which has terms $1/\log^2(n)$: the sum should diverge.
Mar
10
answered Prove that if $\sum_{n=1}^{\infty} |a_n|$ converges and $(b_n)^{\infty}_{n=1}$ is a bounded sequence, then $\sum_{n=1}^{\infty} |a_nb_n|$ converges
Feb
21
comment $\frac {\operatorname d\!y}{\operatorname d\!x}$ for $\sqrt{xy}=1$
Formally it should be $\ln|x|,\ln|y|$.
Feb
20
comment Is $\sqrt{2}^\sqrt{2}$ rational or irrational?
The correct duplicate of this question is here, which at least tries to avoid the full Gelfond Schneider theorem: mathoverflow.net/questions/138247/…