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visits member for 3 years, 9 months
seen Dec 18 at 22:25

Dec
10
accepted You only need countable many sets each time in a generated $\sigma$-algebra, right?
Nov
5
accepted How do I prove that $\cos{\frac{2\pi}{7}}\notin\mathbb{Q}$?
Dec
16
accepted Why is this unbounded linear functional also has a closed kernel?
Dec
11
accepted If a linear functional is not bounded, then it has a non-closed kernel.
Jun
26
accepted Is convergence in $I^I$ topology equivalent to point-wise convergence?
Jun
17
accepted Does a nonnegative real matrix always have a nonnegative eigenvector?
May
20
accepted Why the root of this tree has to be “1”?
Feb
26
accepted What is the sufficient and necessary condition for $U$ and $V$ to be the same in the SVD?
Dec
17
accepted How is it that the derivative operator is a closed linear operator?
Dec
10
accepted Is the set of real numbers the largest possible totally ordered set?
Nov
28
accepted Do $e_1$, $e_2$, … generate the entire $l_2$ space?
Nov
25
accepted For what values of $\alpha$ does this integral converge?
Oct
23
accepted Tossing 10 coins, what's the easiest way to see that these two events are independent?
Oct
16
accepted What's the algorithm of finding the convex combination of permutation matrices for a doubly stochastic matrix?
Oct
7
accepted Is there a particular notation for a function confined in a set?
Oct
3
accepted Is this function sequence applicable for Arzelà–Ascoli?
Oct
3
accepted How do I prove that if $A$ is positive definite, then it is invertible and $A^{-1}$ is also positive definite?
Oct
2
accepted Two questions for Hermitian matrices.
Oct
2
accepted Find all real numbers $t$ such that the quadratic form $f$ is positive definite.
Sep
29
accepted A probability question about tossing a coin.