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Dec
31
accepted $U \subset \mathbb{C}$ open, how do I construct $f$ holomorphic, such that there is no continuation of $f$ on any neighbourhood of $z \in \partial U$?
Dec
31
accepted How should I think about reflexive spaces? What “property” do I get from a space being reflexive?
Feb
19
accepted How can I find a non-negative interpolation function?
Jan
8
accepted Why does $e_i \in \ell^2$ weakly converge to $0$?
Dec
13
accepted Showing that a matrix is positive (semi-)definite
Dec
9
accepted Is the matrix corresponding to an equivalence relation positive semidefinite?
Nov
30
accepted Understanding the intermediate field method for the $\phi^4$ interaction
Nov
21
accepted How to show $\mu(\overline{\mathbb{R}}) = \overline{\mathbb{R}}$ iff $a, b, c, d \in \mathbb{R}$ for $\mu(z) = \frac{az+b}{cz+d}$?
Nov
20
accepted Concerning the distribution of a random variable of a random walk that doesn't make any sense to me
Aug
21
accepted Proving Sylow's first theorem
Jul
25
accepted Differentiating terms involving evaluation operator and Wronski matrix
Jul
25
accepted What is an evaluation operator and what is its use?
Jul
3
accepted Construction of field extensions
Jun
27
accepted Application of the Chinese Remainder Theorem
Jun
25
accepted What is the orbit of a permutation?
Jun
24
accepted Proving that every finite group with $|G| = pqr$ for $p,q,r$ distinct primes is solvable
Jun
24
accepted For $G$ group and $H$ subgroup of finite index, prove that $N \subset H$ normal subgroup of $G$ of finite index exists
Jun
24
accepted Proving that every finite group has a composition series
Apr
25
accepted How to show $\dim_\mathcal{H} f(F) \leq \dim_\mathcal{H} F$ for any set $F \subset \mathbb{R}$ and $f$ continuously differentiable?
Jan
29
accepted Questions regarding the complex logarithm and complex integration