Question

A metric on $\mathbb N$ with no isolated points.

score 27 · Answer 1 · 2020-02-23 05:45:45

27

Views

A metric on $\mathbb N$ with no isolated points.

Published on 23 Feb 2020 - 5:45

score 125 · Answer 2 · 2026-03-28 00:12:19

125

Views

A question about an example of a monotone class.

Published on 28 Mar 2026 - 0:12

score 72 · Answer 3 · 2020-02-27 11:04:39

72

Views

Example of function such that its each derivative and itself vanishes at 0 but any polynomial multiple of that function doesnot vanishes at infinity

Published on 27 Feb 2020 - 11:04

score 57 · Answer 4 · 2026-03-25 19:05:11

57

Views

If $\varphi:R\to S$ be a surjective ring homomorphism then $\varphi(R^) $is not always $S^$

Published on 25 Mar 2026 - 19:05

score 83 · Answer 5 · 2026-04-01 06:11:30

83

Views

Why does the naive definition of fourier transform on $L^2$ fail?

Published on 01 Apr 2026 - 6:11

score 382 · Answer 6 · 2026-03-25 05:09:02

382

Views

Prove or Disprove this statement .

Published on 25 Mar 2026 - 5:09

score 118 · Answer 7 · 2026-03-25 19:09:53

118

Views

Possible relationship between non-divisors of odd perfect numbers and coefficients of corresponding cyclotomic polynomials?

Published on 25 Mar 2026 - 19:09

score 159 · Answer 8 · 2020-03-01 08:45:13

159

Views

$\forall\epsilon>0\exists\delta_\epsilon>0: U_{\delta_\epsilon} (A)\cap U_{\delta_\epsilon} (B)\subseteq U_\epsilon(A\cap B) $

Published on 01 Mar 2020 - 8:45

score 84 · Answer 9 · 2026-04-01 06:07:24

84

Views

Why can't the Fourier transform be defined on $L^2$ by an improper integral?

Published on 01 Apr 2026 - 6:07

score 2.4k · Answer 10 · 2020-03-02 14:50:07

2.4k

Views

Counterexample in Fubini's Theorem (non-integrable function)

Published on 02 Mar 2020 - 14:50

score 109 · Answer 11 · 2020-03-04 18:30:00

109

Views

Show that if $a < b$ and $a \leq c$ then $b \leq c$

Published on 04 Mar 2020 - 18:30

score 127 · Answer 12 · 2026-03-25 14:36:39

127

Views

Prove $\sqrt[3]{\frac{(a^4+b^4)(a^4+c^4)(b^4+c^4)}{abc}}\ge \sqrt{\frac{(a^3+bc)(b^3+ca)(c^3+ab)}{1+abc}}$

Published on 25 Mar 2026 - 14:36

score 247 · Answer 13 · 2026-02-23 02:37:15

247

Views

Two random variables not gaussian but whose sum is gaussian

Published on 23 Feb 2026 - 2:37

score 694 · Answer 14 · 2020-03-05 07:45:38

694

Views

Let $a,b\in\mathbb{R}$ and $a<b$. Which of the following statement(s) is/are true?

Published on 05 Mar 2020 - 7:45

score 60 · Answer 15 · 2020-03-05 11:07:01

60

Views

Please help me finding counterexample (continuous but not analytic).

Published on 05 Mar 2020 - 11:07

List Question

A metric on $\mathbb N$ with no isolated points.

A question about an example of a monotone class.

Example of function such that its each derivative and itself vanishes at 0 but any polynomial multiple of that function doesnot vanishes at infinity

If $\varphi:R\to S$ be a surjective ring homomorphism then $\varphi(R^) $is not always $S^$

Why does the naive definition of fourier transform on $L^2$ fail?

Prove or Disprove this statement .

Possible relationship between non-divisors of odd perfect numbers and coefficients of corresponding cyclotomic polynomials?

$\forall\epsilon>0\exists\delta_\epsilon>0: U_{\delta_\epsilon} (A)\cap U_{\delta_\epsilon} (B)\subseteq U_\epsilon(A\cap B) $

Why can't the Fourier transform be defined on $L^2$ by an improper integral?

Counterexample in Fubini's Theorem (non-integrable function)

Show that if $a < b$ and $a \leq c$ then $b \leq c$

Prove $\sqrt[3]{\frac{(a^4+b^4)(a^4+c^4)(b^4+c^4)}{abc}}\ge \sqrt{\frac{(a^3+bc)(b^3+ca)(c^3+ab)}{1+abc}}$

Two random variables not gaussian but whose sum is gaussian

Let $a,b\in\mathbb{R}$ and $a<b$. Which of the following statement(s) is/are true?

Please help me finding counterexample (continuous but not analytic).

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