List questions from partial-differential-equations

Published on 12 Apr 2026 - 2:30

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Confused solving quasilinear PDE

Published on 14 Apr 2026 - 14:55

378

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Is it a Sobolev function?

Published on 09 Apr 2026 - 11:56

80

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Drums and wave equation, a clarification of an assertion

Published on 08 Apr 2026 - 21:06

1.8k

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Mollification of $L^{\infty}$ functions

Published on 13 Apr 2026 - 1:00

54

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A special property of harmonic function

Published on 10 Apr 2026 - 18:14

1.8k

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Why does an eigenvalue expansion 'work' for PDEs?

Published on 13 Apr 2026 - 1:35

134

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Counterexample for existence of a minimiser in a variational problem

Published on 11 Apr 2026 - 4:59

3.1k

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Maximum principle for harmonic functions on unbounded domain

Published on 11 May 2026 - 3:12

3.4k

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A harmonic function bounded from below is constant

Published on 12 Apr 2026 - 6:42

166

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I need a counterexample can prove that sequence of harmonic functions may not convergences to a harmonic function

Published on 13 Apr 2026 - 1:57

69

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Partial differential equation, known solution

Published on 10 Apr 2026 - 16:03

483

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On Yau's (and Schoen's) proof of the positive mass theorem

Published on 10 May 2026 - 19:41

113

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Exercise on discontinuous coefficients in first order pde

Published on 14 Apr 2026 - 15:14

235

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Partial differential equation $3u_y+u_{xy}=0$

Published on 14 Apr 2026 - 11:43

List Question

Parametrisation of boundary conditions for a quasilinear wave equation

Confused solving quasilinear PDE

Is it a Sobolev function?

Drums and wave equation, a clarification of an assertion

Mollification of $L^{\infty}$ functions

A special property of harmonic function

Why does an eigenvalue expansion 'work' for PDEs?

Counterexample for existence of a minimiser in a variational problem

Maximum principle for harmonic functions on unbounded domain

A harmonic function bounded from below is constant

I need a counterexample can prove that sequence of harmonic functions may not convergences to a harmonic function

Partial differential equation, known solution

On Yau's (and Schoen's) proof of the positive mass theorem

Exercise on discontinuous coefficients in first order pde

Partial differential equation $3u_y+u_{xy}=0$

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