List questions from partial-differential-equations

Published on 09 Apr 2026 - 8:09

102

Views

Find coordinates that straightens the vector field (Cauchy's problem

Published on 25 Nov 2018 - 9:20

41

Views

$dh/dt \pm \sqrt{h} du/dt = 0 $ $\rightarrow $ $d/dt(u \pm 2 \sqrt{h}) = 0 $

Published on 25 Nov 2018 - 20:30

315

Views

weak solution of PDE and apply Lax-Milgram

Published on 12 Apr 2026 - 23:48

266

Views

Theoretical Solution for this Poisson Equation Problem

Published on 25 Mar 2026 - 11:17

121

Views

Does $\cos\left(\frac{2\pi}2\right) = 0$?

Published on 28 Mar 2026 - 0:49

46

Views

For a bounded linear functional $l(v) := (f,v)_\Omega$, do we have $\|l\| \le \|f\|$?

Published on 25 Mar 2026 - 1:37

238

Views

$\sup_K |\partial^{\alpha}u|\le C^{|\alpha|+1}\alpha!^s$ then $u$ is analytic for $s\le 1$

Published on 25 Mar 2026 - 10:55

315

Views

Riesz representation and inverse operator.

Published on 10 Apr 2026 - 5:37

136

Views

Why a solution for $c^2 \Delta u = u_{tt}$ must have eigenfunctions as its series terms expansion?

Published on 08 Apr 2026 - 17:55

166

Views

$d^2u/dx^2 - d^2u/dy^2 = f(x,y)$ $\rightarrow$ $d^2u/dξdη = \frac{1}{4}f(\frac{1}{2}(ξ+η),\frac{1}{2}(η-ξ))$

Published on 30 Mar 2026 - 16:30

259

Views

$\Omega$ open connected of $\mathbb{R}^N$ and $K\subset \Omega$ compact, then $c u(x) \le u(x')\le C u(x)$ for $u$ harmonic

Published on 26 Nov 2018 - 20:11

617

Views

$u_{xx} + u_{xy} + u_{yy} = 0$ in canonical form

Published on 12 Apr 2026 - 18:56

265

Views

$u$ is a spherical wave $\iff$ $f$ and $g$ are radial

Published on 11 Apr 2026 - 11:36

512

Views

How do I show that the system is hyperbolic if $u^2 + v^2 > c^2$

Published on 25 Mar 2026 - 19:03

List Question

Solution for $u_{t} = \alpha^{2}u_{xx}$ (problem with Fourier Series of inicial condition)

Find coordinates that straightens the vector field (Cauchy's problem

$dh/dt \pm \sqrt{h} du/dt = 0 $ $\rightarrow $ $d/dt(u \pm 2 \sqrt{h}) = 0 $

weak solution of PDE and apply Lax-Milgram

Theoretical Solution for this Poisson Equation Problem

Does $\cos\left(\frac{2\pi}2\right) = 0$?

For a bounded linear functional $l(v) := (f,v)_\Omega$, do we have $\|l\| \le \|f\|$?

$\sup_K |\partial^{\alpha}u|\le C^{|\alpha|+1}\alpha!^s$ then $u$ is analytic for $s\le 1$

Riesz representation and inverse operator.

Why a solution for $c^2 \Delta u = u_{tt}$ must have eigenfunctions as its series terms expansion?

$d^2u/dx^2 - d^2u/dy^2 = f(x,y)$ $\rightarrow$ $d^2u/dξdη = \frac{1}{4}f(\frac{1}{2}(ξ+η),\frac{1}{2}(η-ξ))$

$\Omega$ open connected of $\mathbb{R}^N$ and $K\subset \Omega$ compact, then $c u(x) \le u(x')\le C u(x)$ for $u$ harmonic

$u_{xx} + u_{xy} + u_{yy} = 0$ in canonical form

$u$ is a spherical wave $\iff$ $f$ and $g$ are radial

How do I show that the system is hyperbolic if $u^2 + v^2 > c^2$

Trending Questions

Popular # Hahtags

Popular Questions