Question

Let $x,y \in X$, $X$ topological vector space then there are two neighborhoods $V_x,V_y$ such that $V_x + V_y \subset W$

score 48 · Answer 1 · 2026-03-25 19:07:14

48

Views

Let $x,y \in X$, $X$ topological vector space then there are two neighborhoods $V_x,V_y$ such that $V_x + V_y \subset W$

Published on 25 Mar 2026 - 19:07

score 605 · Answer 2 · 2026-03-27 23:29:59

605

Views

Multiplicative inverse questions

Published on 27 Mar 2026 - 23:29

score 69 · Answer 3 · 2026-03-29 20:44:33

69

Views

Find $P(Y>13)$ if $Y = X^2$

Published on 29 Mar 2026 - 20:44

score 152 · Answer 4 · 2026-03-25 13:56:17

152

Views

$\forall k,n \in\mathbb N:k\in n\iff k\subsetneq n$ [Proof Verification and Suggestion for shorter or simpler proof]

Published on 25 Mar 2026 - 13:56

score 406 · Answer 5 · 2026-03-27 14:46:47

406

Views

$G$ acts properly discontinuous upon $\mathbb{R}$ so $G\cong\mathbb{Z}$

Published on 27 Mar 2026 - 14:46

score 351 · Answer 6 · 2018-07-03 05:19:54

351

Views

Every weak closed set is convex?

Published on 03 Jul 2018 - 5:19

score 47 · Answer 7 · 2018-07-03 10:51:46

47

Views

Doubt about a proof involving Cauchy sequences in normed spaces with a convergent subsequence

Published on 03 Jul 2018 - 10:51

score 234 · Answer 8 · 2018-07-03 17:57:39

234

Views

Converting to Complex coordinates to check injectivity of $f(x,y)=(e^x\cos{y},e^x\sin{y})$

Published on 03 Jul 2018 - 17:57

score 888 · Answer 9 · 2026-03-30 07:52:02

888

Views

$\phi(t) = \exp(-|t|^\alpha)$ is a characteristic function iff $\alpha = 2$

Published on 30 Mar 2026 - 7:52

score 389 · Answer 10 · 2026-03-17 05:26:59

389

Views

Prove that $f$ is absolutely continuous.

Published on 17 Mar 2026 - 5:26

score 50 · Answer 11 · 2026-03-24 20:42:37

50

Views

Elementary Computation of the Flow of the Metric Tensor under Mean Curvature Flow

Published on 24 Mar 2026 - 20:42

score 253 · Answer 12 · 2026-03-26 23:37:56

253

Views

Lesser-known fake proofs

Published on 26 Mar 2026 - 23:37

score 110 · Answer 13 · 2018-07-04 05:34:15

110

Views

$<$ is a trichotomic relation on $\mathbb N$

Published on 04 Jul 2018 - 5:34

score 173 · Answer 14 · 2026-04-03 19:07:25

173

Views

Finding $f_X(x)$ and $f_{X,Y}(x,y)$ given $f_{X_1,X_2}(x_1,x_2)$ where $X_1=X+Y$ and $X_2=X-Y$

Published on 03 Apr 2026 - 19:07

score 55 · Answer 15 · 2026-03-27 15:16:44

55

Views

Show that the following sequence is unbounded.

Published on 27 Mar 2026 - 15:16

List Question

Let $x,y \in X$, $X$ topological vector space then there are two neighborhoods $V_x,V_y$ such that $V_x + V_y \subset W$

Multiplicative inverse questions

Find $P(Y>13)$ if $Y = X^2$

$\forall k,n \in\mathbb N:k\in n\iff k\subsetneq n$ [Proof Verification and Suggestion for shorter or simpler proof]

$G$ acts properly discontinuous upon $\mathbb{R}$ so $G\cong\mathbb{Z}$

Every weak closed set is convex?

Doubt about a proof involving Cauchy sequences in normed spaces with a convergent subsequence

Converting to Complex coordinates to check injectivity of $f(x,y)=(e^x\cos{y},e^x\sin{y})$

$\phi(t) = \exp(-|t|^\alpha)$ is a characteristic function iff $\alpha = 2$

Prove that $f$ is absolutely continuous.

Elementary Computation of the Flow of the Metric Tensor under Mean Curvature Flow

Lesser-known fake proofs

$<$ is a trichotomic relation on $\mathbb N$

Finding $f_X(x)$ and $f_{X,Y}(x,y)$ given $f_{X_1,X_2}(x_1,x_2)$ where $X_1=X+Y$ and $X_2=X-Y$

Show that the following sequence is unbounded.

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