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Which list of an action names the fluents it makes false?

  • A.A fluent that must be false for the action to apply
  • B.A fluent that the action leaves in an unknown state
  • C.A fluent the action makes false
  • D.A fluent the action removes from the domain entirely

Answer: C

The delete list names the fluents that cease to hold, and ignoring it gives the relaxation from which almost every modern planning heuristic is derived. Removing a fluent from the domain, negative preconditions and unknown values are different notions. That one list of a representation can be dropped to obtain a tractable relaxation is a happy accident of the formalism, and it is worth appreciating how much rests on it.

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