Question

Proof verification on the openness of the space of matrices of full rank

score 216 · Answer 1 · 2018-10-14 16:06:11

216

Views

Proof verification on the openness of the space of matrices of full rank

Published on 14 Oct 2018 - 16:06

score 1.3k · Answer 2 · 2026-03-24 23:41:51

1.3k

Views

Smooth and not analytic

Published on 24 Mar 2026 - 23:41

score 167 · Answer 3 · 2018-10-21 13:53:39

167

Views

Smooth Urysohn function having $0$ as regular value

Published on 21 Oct 2018 - 13:53

score 894 · Answer 4 · 2018-10-24 14:43:48

894

Views

existence of a smooth function with bounded derivative

Published on 24 Oct 2018 - 14:43

score 843 · Answer 5 · 2018-10-25 12:12:42

843

Views

Sigmoid functions similar to atan but with different upper and lower bound

Published on 25 Oct 2018 - 12:12

score 61 · Answer 6 · 2018-10-26 20:14:57

61

Views

Function that are not smooth because $f(U) \not \subset V$

Published on 26 Oct 2018 - 20:14

score 148 · Answer 7 · 2018-10-30 18:48:14

148

Views

$C^n$ function with big/small O notation

Published on 30 Oct 2018 - 18:48

score 651 · Answer 8 · 2018-10-31 18:49:57

651

Views

Prove that a function is smooth easily

Published on 31 Oct 2018 - 18:49

score 81 · Answer 9 · 2018-10-31 19:09:18

81

Views

A more wide class than smooth functions

Published on 31 Oct 2018 - 19:09

score 53 · Answer 10 · 2018-11-01 15:27:14

53

Views

How to show that $\exists$ $\phi\in C_c^{\infty}(\Omega)$ s.t. $\int_{\Omega_1}D\phi(x)dx$ has unit norm?

Published on 01 Nov 2018 - 15:27

score 65 · Answer 11 · 2026-03-25 19:05:15

65

Views

Which function in the Schwarz class of functions is "closest" to triangle wave in $L^2$ sense?

Published on 25 Mar 2026 - 19:05

score 73 · Answer 12 · 2026-03-25 20:36:09

73

Views

Can I find an infinitely differentiable function of of bounded moments closest to triangle wave?

Published on 25 Mar 2026 - 20:36

score 709 · Answer 13 · 2018-11-05 17:41:21

709

Views

Decreasing smooth approximation of an indicator function with bounded derivative

Published on 05 Nov 2018 - 17:41

score 19 · Answer 14 · 2018-11-06 03:26:46

19

Views

Extending function with local maximum in a bounded smooth domain.

Published on 06 Nov 2018 - 3:26

score 329 · Answer 15 · 2018-11-08 09:55:27

329

Views

Proof that the product of locally integrable function $g$ with any test function is zero implies $g=0$ a.e

Published on 08 Nov 2018 - 9:55

List Question

Proof verification on the openness of the space of matrices of full rank

Smooth and not analytic

Smooth Urysohn function having $0$ as regular value

existence of a smooth function with bounded derivative

Sigmoid functions similar to atan but with different upper and lower bound

Function that are not smooth because $f(U) \not \subset V$

$C^n$ function with big/small O notation

Prove that a function is smooth easily

A more wide class than smooth functions

How to show that $\exists$ $\phi\in C_c^{\infty}(\Omega)$ s.t. $\int_{\Omega_1}D\phi(x)dx$ has unit norm?

Which function in the Schwarz class of functions is "closest" to triangle wave in $L^2$ sense?

Can I find an infinitely differentiable function of of bounded moments closest to triangle wave?

Decreasing smooth approximation of an indicator function with bounded derivative

Extending function with local maximum in a bounded smooth domain.

Proof that the product of locally integrable function $g$ with any test function is zero implies $g=0$ a.e

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