List questions from partial-derivative

Published on 11 Apr 2026 - 14:27

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Find the Characteristic Curves and general solution of a PDE

Published on 23 Jan 2017 - 15:54

236

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Subharmonic functions with finite norm

Published on 29 Mar 2026 - 15:14

648

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Partial derivatives from two or more data points

Published on 23 Jan 2017 - 20:39

99

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Solving $au_x + bu_y = f(x,y)$

Published on 24 Jan 2017 - 2:57

269

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Interchanging Derivatives and Limits with limits as a dependent variable of the partial deriviative.

Published on 11 Apr 2026 - 23:09

5.5k

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Differentiability in $(0,0)$ of $f(x,y)=\frac{x^4-y^3}{x^2+y^2}$

Published on 24 Jan 2017 - 9:57

122

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$F(x,y)=sin(||f(x)+y||)^2$ - find the $DF (x, y) (u, v)$ through $Df (x) (u).$

Published on 24 Jan 2017 - 11:53

208

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Euler-lagrange stationary value

Published on 11 Apr 2026 - 15:26

368

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How to solve this Quasi-linear PDE?

Published on 25 Jan 2017 - 8:40

240

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Prove that there is a unique function of class $C^1$ such that for all $x \in \mathbb{R}$: $x^2f(x)^3 + 3x^3f (x)^2 + (5x^4 + 1) f (x) = \cos (f (x))$

Published on 25 Jan 2017 - 18:36

64

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On being able to write an arbitrary $ C^{3} $-solution of a particular third-order PDE in a special way

Published on 28 Mar 2026 - 0:05

46

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Is this condition necessary for a function $f : \mathbb{R}^m \to \mathbb{R}^n$ to be differentiable?

Published on 26 Jan 2017 - 2:35

87

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3 Part Question asking to prove that $f$ is continuous at (0,0) and then finding the partial derivatives and showing it is not differentiable

Published on 26 Jan 2017 - 2:35

39

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Function that will follow a ball going downhill

Published on 12 Apr 2026 - 1:07

List Question

Proof related to Dirichlet's principle

Find the Characteristic Curves and general solution of a PDE

Subharmonic functions with finite norm

Partial derivatives from two or more data points

Solving $au_x + bu_y = f(x,y)$

Interchanging Derivatives and Limits with limits as a dependent variable of the partial deriviative.

Differentiability in $(0,0)$ of $f(x,y)=\frac{x^4-y^3}{x^2+y^2}$

$F(x,y)=sin(||f(x)+y||)^2$ - find the $DF (x, y) (u, v)$ through $Df (x) (u).$

Euler-lagrange stationary value

How to solve this Quasi-linear PDE?

Prove that there is a unique function of class $C^1$ such that for all $x \in \mathbb{R}$: $x^2f(x)^3 + 3x^3f (x)^2 + (5x^4 + 1) f (x) = \cos (f (x))$

On being able to write an arbitrary $ C^{3} $-solution of a particular third-order PDE in a special way

Is this condition necessary for a function $f : \mathbb{R}^m \to \mathbb{R}^n$ to be differentiable?

3 Part Question asking to prove that $f$ is continuous at (0,0) and then finding the partial derivatives and showing it is not differentiable

Function that will follow a ball going downhill

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