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The frame problem can be thought of as the problem of formalizing the principle that, by default, "everything is presumed to remain in the state in which it is" (Leibniz, "An Introduction to a Secret Encyclopædia", c. 1679).
The situation calculus is a logic formalism designed for representing and reasoning about dynamical domains. It was first introduced by John McCarthy in 1963. [1] The main version of the situational calculus that is presented in this article is based on that introduced by Ray Reiter in 1991.
This representation of fluents is used in the event calculus, in the fluent calculus, and in the features and fluents logics. Some fluents can be represented as functions in a different way. For example, the position of a box can be represented by a function o n ( b o x , t ) {\displaystyle on(box,t)} whose value is the object the box is ...
A binary function symbol 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 {\displaystyle s} is represented by the formula ∃ t . s = o n ( b o x , t a b l e ) ∘ t {\displaystyle \exists t.s=on(box,table)\circ t} .
The event calculus was developed in part as an alternative to the situation calculus, [6] [7] as a solution to the frame problem, of representing and reasoning about the way in which actions and other events change the state of some world. There are many variants of the event calculus.
The name "frame problem" has been at some point used to indicate more generally the problem of "formalizing domains with actions in logic", but I think this use is obsolete now. Regarding inertia, this was the initial assmption in the original problem; there are however some logics where fluents can be specified not to be inertial.
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Fluent Design System (codenamed "Project Neon"), [11] officially unveiled as Microsoft Fluent Design System, [12] is a design language developed in 2017 by Microsoft.Fluent Design is a revamp of Microsoft Design Language 2 (sometimes erroneously known as "Metro", the codename of Microsoft Design Language 1) that includes guidelines for the designs and interactions used within software designed ...