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Which representation is needed to say that one block is on another?

  • A.Structured
  • B.Atomic, since the whole configuration is a single state
  • C.Factored representation
  • D.Any of them, since the choice is a matter of convenience

Answer: A

Expressing a relation between two objects requires a structured representation with objects, relations and the ability to quantify over them, which is what first order logic and relational planning languages provide. A factored representation can encode a fixed set of blocks clumsily but cannot generalise over them. Atomic representations cannot express it at all. The choice is not merely convenience: it determines what can be said as well as what can be computed.

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