a) t+\(\frac{\Delta t}{3}\)
b) t+\(\frac{\Delta t}{2}\)
c) t-\(\frac{\Delta t}{2}\)
d) t+\(\frac{\Delta t}{4}\)
Answer: b
Explanation: The first step of the ADI scheme is from t to t+\(\frac{\Delta t}{2}\). The second step of the ADI scheme is from t+\(\frac{\Delta t}{2}\) to t+Δt. Here, the intermediate step t+\(\frac{\Delta t}{2}\) is extra for the process and the results here are not actually needed.
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