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Implicit methods are timestepping methods that use an inversion at every timestep. This allows for much better stability properties than explicit methods, though it comes with a serious speed penalty in some cases. Examples of implicit methods include Backward Euler and Crank-Nicholson.
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Why is Crank-Nicolson considered implicit in time?
A simplification - the Crank-Nicolson method uses the average of the forward and backward Euler methods.
The backward Euler method is implicit, so Crank-Nicolson, having this as one of its component …