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Fluent calculus : ウィキペディア英語版
Fluent calculus
The fluent calculus is a formalism for expressing dynamical domains in first-order logic. It is a variant of the situation calculus; the main difference is that situations are considered representations of states. A binary function symbol \circ is used to concatenate the terms that represent facts that hold in a situation. For example, that the box is on the table in the situation s is represented by the formula \exists t . s = on(box,table) \circ t. The frame problem is solved by asserting that the situation after the execution of an action is identical to the one before but for the conditions changed by the action. For example, the action of moving the box from the table to the floor is formalized as:
: State(Do(move(box,table,floor), s)) \circ on(box,table) = State(s) \circ on(box,floor)
This formula states that the state after the move is added the term on(box,floor) and removed the term on(box,table). Axioms specifying that \circ is commutative and non-idempotent are necessary for such axioms to work.
==See also==

* Fluent (artificial intelligence)
* Frame problem
* Situation calculus
* Event calculus

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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