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STRIPS

  • Definition – Plan
      Let (P,A,I,G) be a task. An action sequence ‹a1, ... ,an› is a plan for the task iff G ⊆ result(I, ‹a1, ... ,an›).
    • In other words, a plan is an organized collection of actions.
    • A plan is said to be a solution to a given problem if the plan is applicable in the problem’s initial state, and if after plan execution, the goal is true.
    • Assume that there is some action in the plan that must be executed first. The plan is applicable if all the preconditions for the execution of this first action hold in the initial state.
    • A task is called solvable if there is a plan, unsolvable otherwise

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