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    Definition – Task

    A task is a quadruple (P,A,I,G) where P is a (finite) set of facts, A is a (finite) set of actions, and I and G are subsets of P, I being the initial state and G the goal state.



  • In other words, a task is defined in terms of:
    • A (finite) set of facts
    • A (finite) set of actions that the planner can perform. Each action is defined in terms of preconditions and effects (i.e. add list and delete list)
    • An initial state i.e. the state of the world before the execution of the task
    • A goal state i.e. the desired state of the world that we want to reach


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