Discussion
What is the additive heuristic in planning?
Answer: C
Summing the individual estimates assumes the subgoals are independent, which overestimates when actions achieve several at once, so it is informative but inadmissible. The maximum is admissible but weak, and the relaxed plan length lies between. Counting unsatisfied goals is a much cruder estimate. Choosing between an admissible weak estimate and an inadmissible strong one is a decision about whether optimality or speed is required. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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