List questions from approximation-theory

Published on 25 Mar 2026 - 19:00

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Approximation of Lipschitz curves by $C^{1,1}$ curves

Published on 27 Mar 2026 - 0:03

14

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Gaining an explicit relation from an implicit equation

Published on 13 Dec 2016 - 19:12

978

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Problem about Weierstrass Approximation

Published on 21 Mar 2026 - 21:30

54

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Demicontinuity implies Continuity on finite-dimensional subspace

Published on 16 Dec 2016 - 16:58

43

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Approximation Theory, Hyperplane, Proximinal Set

Published on 18 Dec 2016 - 21:34

21.4k

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Second order central difference = first order central difference applied twice?

Published on 25 Mar 2026 - 7:40

380

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Some questions on an application of the Ascoli-Arzelà theorem (Lipschitz continuity, local uniform convergence, ...)

Published on 26 Dec 2016 - 16:11

27

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Extra Asymptotics

Published on 09 Jan 2017 - 14:55

568

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Certain uniform approximations of a bounded uniformly continuous function

Published on 10 Jan 2017 - 19:05

86

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Are there guarantees on the $ L^2$ error of the best polynomial approximation (or pessimistic theorems)?

Published on 14 Jan 2017 - 6:04

140

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Approximate $f(x,y)$ by $g_1(x)h_1(y)+\dots+g_n(x)h_n(y)$ for compact topological spaces.

Published on 18 Jan 2017 - 2:01

49

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Is it correct to replace $O(\epsilon) - O(\delta)$ by $ O(\epsilon)$ if $\epsilon \gg \delta$?

Published on 26 Mar 2026 - 21:25

172

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Relative error in Laplace's expansion

Published on 31 Jan 2017 - 1:37

25

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Derivative of a smooth function of given zero set

Published on 07 Feb 2017 - 19:47

List Question

Approximation Theory, Projections and Hyperplanes

Approximation of Lipschitz curves by $C^{1,1}$ curves

Gaining an explicit relation from an implicit equation

Problem about Weierstrass Approximation

Demicontinuity implies Continuity on finite-dimensional subspace

Approximation Theory, Hyperplane, Proximinal Set

Second order central difference = first order central difference applied twice?

Some questions on an application of the Ascoli-Arzelà theorem (Lipschitz continuity, local uniform convergence, ...)

Extra Asymptotics

Certain uniform approximations of a bounded uniformly continuous function

Are there guarantees on the $ L^2$ error of the best polynomial approximation (or pessimistic theorems)?

Approximate $f(x,y)$ by $g_1(x)h_1(y)+\dots+g_n(x)h_n(y)$ for compact topological spaces.

Is it correct to replace $O(\epsilon) - O(\delta)$ by $ O(\epsilon)$ if $\epsilon \gg \delta$?

Relative error in Laplace's expansion

Derivative of a smooth function of given zero set

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