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Feb
16
comment Proving a function of matrix is convex
Thanks Michael. I get the determinant of the Hessian to be $-\frac{y^2}{(a-1)^4}$, which is negative?
Feb
16
comment Proving a function of matrix is convex
I meant $f$ is a function of both $A$ and $b$. However I am struggling even with the case when $f$ is only a function of $A$.
Feb
16
asked Proving a function of matrix is convex
Feb
6
awarded  Yearling
Jan
7
asked If $X$ and $Y$ are independent random variables, is $\mathbb{E}(f(X)\mid X\le Y)=\mathbb{E}(f(X))$?
Dec
20
accepted Joint distribution of arrival times in Poisson process
Dec
20
comment Joint distribution of arrival times in Poisson process
Thanks Did. I guess it would be $f_{S_A}(t_1)\times f_{S_B}(t_2-t_1)$, with the $S_A$ being Erlang. Correct?
Dec
20
awarded  Constituent
Dec
18
asked Joint distribution of arrival times in Poisson process
Dec
10
awarded  Caucus
Nov
25
awarded  Notable Question
Nov
20
asked Evaluation a function of degree of vertices in a graph
Nov
3
accepted Optimisation over matrix entries
Oct
20
asked Optimisation over matrix entries
Sep
30
awarded  Explainer
Sep
16
revised For exponential random variables $X_i$, how to find $P(t-X_1<X_2\mid t-X_1<X_3)$?
added 4 characters in body
Sep
16
asked For exponential random variables $X_i$, how to find $P(t-X_1<X_2\mid t-X_1<X_3)$?
Sep
16
revised Is there a closed form solution for this differential equation?
minor changes.
Sep
16
comment How to solve integrals of the form $\int u^{-\alpha} e^{-\beta u} du$?
Let us continue this discussion in chat.
Sep
16
suggested approved edit on Is there a closed form solution for this differential equation?