Symbolic partial derivative input

23774627 · August 30, 2023, 5:36am

Hi,

Could someone please tell me how to enter this PDE into Mathematica? I am really struggling with the partials.

Cheers, Paul

gianlucagorni · August 30, 2023, 2:06pm

Here is a way, using the D operator:

D[u[r, t], t] ==
 1/r D[r*D[u[r, t], r], r]
(D[u[r, t], r] /. r -> 0) == 0
(D[u[r, t], r] /. r -> 1) == 0

23774627 · August 30, 2023, 10:26pm

Thank you, I will try that

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