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What is an add effect of an action?

  • A.A fluent whose value the action leaves unchanged
  • B.A fluent the action makes true
  • C.A fluent the action makes false
  • D.A fluent the action requires to be true beforehand

Answer: B

The add list names what becomes true and the delete list what becomes false, and everything unmentioned persists. The delete relaxation ignores the second list, which is what makes the relaxed problem monotonic. Preconditions and unchanged fluents are different categories. Knowing which list a heuristic ignores, and why that makes the relaxed problem easy, connects the representation directly to the heuristics computed from it.

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