List questions from partial-differential-equations

Published on 25 Mar 2026 - 4:39

519

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Existence of unique solution for the Laplace equation with mixed Dirichlet-Robin condition

Published on 25 Mar 2026 - 11:02

822

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PDE IVP - Characteristics, why is my method wrong?

Published on 25 Mar 2026 - 2:13

160

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Trick to prove orthogonality for eigenfunctions?

Published on 25 Mar 2026 - 7:58

459

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Let u be harmonic, show that u*g is harmonic

Published on 25 Mar 2026 - 9:24

467

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What is the height when the ball is thrown vertically upward with air resistance??

Published on 12 May 2018 - 14:54

107

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Solving : $2xy \cdot u_x + u_y - u = 0$

Published on 25 Mar 2026 - 4:36

165

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Finding the characteristic curves of a PDE

Published on 27 Mar 2026 - 11:23

104

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Is it possible to obtain an expression for the spectrum of a compact embedding operator? E.g. for $I:H^1([0,1])\to L^1([0,1])$?

Published on 25 Mar 2026 - 7:44

1.7k

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Regions where : $2u_{xx} + 4u_{xy} + 3u_{yy} - u = 0$ is hyperbolic, parabolic or elliptic

Published on 25 Mar 2026 - 7:44

72

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Theoretical integral curve - fields lemma proof

Published on 13 May 2018 - 12:29

64

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Inequality regarding weak solution of $-\operatorname{div} (a(\nabla u))=f$

Published on 03 Apr 2026 - 15:47

272

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General solution of a first order PDE with zeroth order term

Published on 25 Mar 2026 - 2:13

89

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Multi-Domain PDE (Helmholtz Equation)

Published on 13 May 2018 - 18:04

42

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What are the differences between these two boundary conditions?

Published on 25 Mar 2026 - 4:36

List Question

Solve the PDE $ u_{tt}=4u_{xx}+A \sin (2 \pi t) $

Existence of unique solution for the Laplace equation with mixed Dirichlet-Robin condition

PDE IVP - Characteristics, why is my method wrong?

Trick to prove orthogonality for eigenfunctions?

Let u be harmonic, show that u*g is harmonic

What is the height when the ball is thrown vertically upward with air resistance??

Solving : $2xy \cdot u_x + u_y - u = 0$

Finding the characteristic curves of a PDE

Is it possible to obtain an expression for the spectrum of a compact embedding operator? E.g. for $I:H^1([0,1])\to L^1([0,1])$?

Regions where : $2u_{xx} + 4u_{xy} + 3u_{yy} - u = 0$ is hyperbolic, parabolic or elliptic

Theoretical integral curve - fields lemma proof

Inequality regarding weak solution of $-\operatorname{div} (a(\nabla u))=f$

General solution of a first order PDE with zeroth order term

Multi-Domain PDE (Helmholtz Equation)

What are the differences between these two boundary conditions?

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