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How do I resolve this stability criterion question?

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Hdez
Hdez on 10 Nov 2020
I really don't understand how to do this following steps: Ask the user to choose a time step, the code should prevent the stability criterion to be broken. As the user to choose the grid spacing
I only got apha= 6,424079066 * 10^-5 but I don't have At and neither I have (Ax)^2 which I know it is the grid spacing h, so I really don't know how to resolve this.

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