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Truncation errors and stability

The following table summarizes the three methods.

Scheme: Truncation Error: Stability requirements:
Crank-Nicolson O(Δx2) and O(Δt2) Stable for all Δt and Δx.
Backward Euler O(Δx2) and O(Δt) Stable for all Δt and Δx.
Forward Euler O(Δx2) and O(Δt) Δt12Δx2