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What is the frame of a logical agent's knowledge about its world?

  • A.The boundary of the region the agent can perceive
  • B.The window of time over which its beliefs remain valid
  • C.The set of predicates the agent's language contains
  • D.The sentences describing what its actions change and leave alone

Answer: D

An agent reasoning about action needs to say not only what each action changes but what it leaves untouched, and stating that concisely is the frame problem. Perceptual boundaries, belief validity and vocabulary are different notions. That the difficulty lies in describing what does not happen, rather than what does, is the counter-intuitive core of reasoning about action and it is worth stating in exactly those terms.

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