Question

Composition of nonlinear maps

score 1.2k · Answer 1 · 2026-04-11 01:46:35

1.2k

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Composition of nonlinear maps

Published on 11 Apr 2026 - 1:46

score 222 · Answer 2 · 2015-11-17 07:41:09

222

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Counterexamples of Annihilator in Infinite Dimensional Setting

Published on 17 Nov 2015 - 7:41

score 1.5k · Answer 3 · 2026-04-02 12:24:25

1.5k

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A Markov process which is not strong Markov process (follow up 2)

Published on 02 Apr 2026 - 12:24

score 136 · Answer 4 · 2015-11-20 16:33:11

136

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Counter example disproving: If $H = \{g^2 | g\in G\}$ is a subgroup of $G$ then $G$ is abelian.

Published on 20 Nov 2015 - 16:33

score 205 · Answer 5 · 2026-03-27 23:48:11

205

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Can any real number be expressed as the sum of a rational number with a number of the Cantor set?

Published on 27 Mar 2026 - 23:48

score 549 · Answer 6 · 2026-04-11 14:28:12

549

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What would be a counterexample to Cauchy's integral formula or Cauchy's theorem?

Published on 11 Apr 2026 - 14:28

score 101 · Answer 7 · 2015-11-21 05:18:31

101

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If $f:[0,1) \to \mathbb{R}$ is continuous and $f(x) > 0$ for all $x$, then there exists $c > 0$ such that $f(x)\geq c$ for all $x$.

Published on 21 Nov 2015 - 5:18

score 64 · Answer 8 · 2015-11-21 05:47:40

64

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If $f:[0,\infty) \to \mathbb{R}$ is continuous and $f(x) > 0$ for all $x$, then there exists $c > 0$ such that $f(x)\geq c$ for all $x$.

Published on 21 Nov 2015 - 5:47

score 48 · Answer 9 · 2015-11-22 08:15:56

48

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Let $ f,g : A \rightarrow A (A \subset R)$ be two bijections. Give examples that f+g and fg are not bijections

Published on 22 Nov 2015 - 8:15

score 65 · Answer 10 · 2015-11-22 18:20:19

65

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Disproving big $O$ identity

Published on 22 Nov 2015 - 18:20

score 112 · Answer 11 · 2015-11-23 10:05:05

112

Views

A $\implies$ ¬A. Is my reasoning on the following example correct?

Published on 23 Nov 2015 - 10:05

score 120 · Answer 12 · 2015-11-23 23:28:21

120

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A nowhere continuous function that maps compact sets to compact sets

Published on 23 Nov 2015 - 23:28

score 75 · Answer 13 · 2026-04-11 08:13:37

75

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Define a bijection

Published on 11 Apr 2026 - 8:13

score 911 · Answer 14 · 2015-11-25 10:04:59

911

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$f$ bounded but $f'$ isn't

Published on 25 Nov 2015 - 10:04

score 1.3k · Answer 15 · 2015-11-25 16:43:57

1.3k

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Show that $f(x) = \log\log(\frac{e}{\Vert x \Vert_{2}})$ is in Sobolev space $W^{1,p}(B_1(0))$

Published on 25 Nov 2015 - 16:43

List Question

Composition of nonlinear maps

Counterexamples of Annihilator in Infinite Dimensional Setting

A Markov process which is not strong Markov process (follow up 2)

Counter example disproving: If $H = \{g^2 | g\in G\}$ is a subgroup of $G$ then $G$ is abelian.

Can any real number be expressed as the sum of a rational number with a number of the Cantor set?

What would be a counterexample to Cauchy's integral formula or Cauchy's theorem?

If $f:[0,1) \to \mathbb{R}$ is continuous and $f(x) > 0$ for all $x$, then there exists $c > 0$ such that $f(x)\geq c$ for all $x$.

If $f:[0,\infty) \to \mathbb{R}$ is continuous and $f(x) > 0$ for all $x$, then there exists $c > 0$ such that $f(x)\geq c$ for all $x$.

Let $ f,g : A \rightarrow A (A \subset R)$ be two bijections. Give examples that f+g and fg are not bijections

Disproving big $O$ identity

A $\implies$ ¬A. Is my reasoning on the following example correct?

A nowhere continuous function that maps compact sets to compact sets

Define a bijection

$f$ bounded but $f'$ isn't

Show that $f(x) = \log\log(\frac{e}{\Vert x \Vert_{2}})$ is in Sobolev space $W^{1,p}(B_1(0))$

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