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Which of these terms cause instability in the Crank-Nicolson scheme when used for finite volume approach?

Which of these terms cause instability in the Crank-Nicolson scheme when used for finite volume approach? Correct Answer Dispersive term

By expanding the results of the Crank-Nicolson scheme using the Taylor series expansion, the scheme is proved to be a second-ordered scheme. The third-ordered term omitted here is a dispersive term causing instabilities.

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