Grigory Yaroslavtsev
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 Oct 1 comment Name for an operation on matrices? Treating j as an $n$-dimensional vector $j[t]$ is its $t$-th entry. Sep 30 comment Name for an operation on matrices? Thanks. I should have fixed this earlier but can't edit the comment. The multiplicativity of rank only holds as an inequality $rank(A \dagger B) \ge rank(A) rank(B)$. Sep 29 comment Name for an operation on matrices? Thanks, just for the rank argument tensor product is definitely enough, I was just wondering about the matrix itself. Sep 29 comment Name for an operation on matrices? I just need the fact that $rank(A \dagger B) = rank(A)rank(B)$ which is easy to show directly. However, it would be helpful to know if this operation and its properties are already known so that I can just cite an appropriate source. I like your "super-slam" idea though :) Sep 29 asked Name for an operation on matrices? Feb 6 awarded Popular Question Sep 12 revised Distribution of a random walk on a directed line added 141 characters in body Sep 12 comment Distribution of a random walk on a directed line Good point, but a closed approximation up to low order terms is fine, i.e. $P[X_2 = 1] = \frac{\ln n }{ n} + \frac{c}{n} + o\left(\frac{1}{n}\right)$. Sep 11 revised Distribution of a random walk on a directed line added 67 characters in body Sep 11 comment Distribution of a random walk on a directed line Thanks, but this still doesn't seem like a closed form. If I take $\frac{d^t g_{nj}(z) }{ d z^t}$ at $z = 0$ then it still looks like an expansion over all possible paths. Sep 11 revised Distribution of a random walk on a directed line added 7 characters in body; edited title Sep 11 asked Distribution of a random walk on a directed line Jul 2 awarded Curious Jun 16 awarded Popular Question Jun 25 awarded Revival Jun 25 awarded Promoter Mar 13 accepted Making a non-monotone function monotone Mar 2 answered Making a non-monotone function monotone Feb 27 awarded Popular Question Jan 21 comment Approximation theory under $L_1$-error Thank you, did you have a chance to look at these sources? Unfortunately, I can't find any preview online and my university library doesn't have them as well.