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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.