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STRIPS

    Definition – Action

      Let P be a set of facts. An action a is a triple a = ( pre(a ), add(a ), del(a )) of subsets of P , where add(a ) \ del(a ) = Ø

      pre(a ) , add(a ) , and del(a ) are called the action precondition , add list , and delete list , respectively

  • In other words, an action is defined in terms of:
    • Preconditions - conjunction of literals that need to be satisfiable before the action is performed
    • Effects - conjunction of literals that need to satisfiable after the action is performed. An effect description includes:
      • Add List: list of formulas to be added to the description of the new state resulting after the action is performed
      • Delete List: list of formulas to be deleted from the description of state before the action is performed


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