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For which of these problems is the Crank-Nicolson scheme unconditionally stable?

For which of these problems is the Crank-Nicolson scheme unconditionally stable? Correct Answer Diffusion problems

When the Crank-Nicolson scheme is applied to the diffusion problems, there is no restriction to the time-step from stability side. It is unconditionally stable for this case. This is why the scheme is often used for diffusion problems.

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