Discussion
Why is the additive heuristic inadmissible?
Answer: D
If one action makes three goal atoms true, counting each separately triples the cost of that action and the total may exceed the true optimum. Ignoring positive interactions is exactly the assumption of independence. The relaxation is genuine and the individual estimates are themselves admissible. Recognising that combining admissible estimates by addition destroys admissibility, unless the subproblems are disjoint, is the same condition that governs additive pattern databases.
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