Question

Another existence and uniqueness proof critique involving composition of functions

score 59 · Answer 1 · 2026-04-09 18:57:34

59

Views

Another existence and uniqueness proof critique involving composition of functions

Published on 09 Apr 2026 - 18:57

score 70 · Answer 2 · 2020-05-12 07:57:18

70

Views

Is there a way to solve $\int \frac1{(x^2+a^2)^2}$ without $x=\tan t$ substitution?

Published on 12 May 2020 - 7:57

score 403 · Answer 3 · 2020-05-12 08:23:00

403

Views

Prove that the Inverse Distributed on Union

Published on 12 May 2020 - 8:23

score 251 · Answer 4 · 2026-04-09 13:27:55

251

Views

How many derangements on a set $[n]$ does there exist such that $\sigma(n)\ne n-1$ ,$\sigma(n-1)\ne n-2$,$\sigma(n-2)\ne n-3$

Published on 09 Apr 2026 - 13:27

score 137 · Answer 5 · 2026-03-25 13:55:26

137

Views

how can I conclude $\|v\|^2_{H^2(\Omega)} \leq C \int (\Delta v)^2 dx$?

Published on 25 Mar 2026 - 13:55

score 113 · Answer 6 · 2026-03-26 12:07:02

113

Views

Show every positive integer can be written in one of the forms $3k$, $3k+1$, $3k+2$ for some integer $k$.

Published on 26 Mar 2026 - 12:07

score 110 · Answer 7 · 2020-05-12 15:59:28

110

Views

Proving that one, and only one, of the following three properties hold for a number

Published on 12 May 2020 - 15:59

score 30 · Answer 8 · 2026-04-11 15:34:42

30

Views

Shifting axes with matrices

Published on 11 Apr 2026 - 15:34

score 96 · Answer 9 · 2026-04-11 22:40:16

96

Views

Is this a redundant term for a probability solution?

Published on 11 Apr 2026 - 22:40

score 21 · Answer 10 · 2026-04-10 20:43:02

21

Views

Missing premise in uniqueness portion of theorem

Published on 10 Apr 2026 - 20:43

score 106 · Answer 11 · 2026-03-26 12:41:18

106

Views

If $I$ and $J$ are bounded intervals, then the intersection $I\cap J$ is also a bounded interval.

Published on 26 Mar 2026 - 12:41

score 325 · Answer 12 · 2026-03-30 07:05:52

325

Views

Showing that any two elements in two normal subgroups commute

Published on 30 Mar 2026 - 7:05

score 92 · Answer 13 · 2020-05-13 01:15:55

92

Views

Prove that $f:X\rightarrow\textbf{R}$ converges to $L$ at $x_{0}$ iff it maps convergence sequences onto convergence sequences.

Published on 13 May 2020 - 1:15

score 119 · Answer 14 · 2026-04-01 03:59:55

119

Views

Nowhere dense sets and metric space

Published on 01 Apr 2026 - 3:59

score 23 · Answer 15 · 2020-05-13 01:36:25

23

Views

Prove that $f(x)\to L$ as $x\to x_{0}\in E$ iff $f(x)\to L$ as $x\to x_{0}\in E\cap(x_{0}-\delta,x_{0}+\delta)$ for every $\delta > 0$.

Published on 13 May 2020 - 1:36

List Question

Another existence and uniqueness proof critique involving composition of functions

Is there a way to solve $\int \frac1{(x^2+a^2)^2}$ without $x=\tan t$ substitution?

Prove that the Inverse Distributed on Union

How many derangements on a set $[n]$ does there exist such that $\sigma(n)\ne n-1$ ,$\sigma(n-1)\ne n-2$,$\sigma(n-2)\ne n-3$

how can I conclude $\|v\|^2_{H^2(\Omega)} \leq C \int (\Delta v)^2 dx$?

Show every positive integer can be written in one of the forms $3k$, $3k+1$, $3k+2$ for some integer $k$.

Proving that one, and only one, of the following three properties hold for a number

Shifting axes with matrices

Is this a redundant term for a probability solution?

Missing premise in uniqueness portion of theorem

If $I$ and $J$ are bounded intervals, then the intersection $I\cap J$ is also a bounded interval.

Showing that any two elements in two normal subgroups commute

Prove that $f:X\rightarrow\textbf{R}$ converges to $L$ at $x_{0}$ iff it maps convergence sequences onto convergence sequences.

Nowhere dense sets and metric space

Prove that $f(x)\to L$ as $x\to x_{0}\in E$ iff $f(x)\to L$ as $x\to x_{0}\in E\cap(x_{0}-\delta,x_{0}+\delta)$ for every $\delta > 0$.

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