Download PDF by Grigoris Antoniou: Nonmonotonic Reasoning

By Grigoris Antoniou

ISBN-10: 0262011573

ISBN-13: 9780262011570

Nonmonotonic reasoning presents formal equipment that let clever platforms to function correctly whilst confronted with incomplete or altering info. particularly, it presents rigorous mechanisms for taking again conclusions that, within the presence of latest details, grow to be improper and for deriving new, replacement conclusions in its place. Nonmonotonic reasoning equipment supply rigor just like that of classical reasoning; they shape a base for validation and verification and hence raise self belief in clever platforms that paintings with incomplete and altering information.Following a short creation to the options of predicate good judgment which are wanted within the next chapters, this e-book provides a detailed remedy of default good judgment. different topics coated contain the main ways of autoepistemic common sense and circumscription, trust revision and its courting to nonmonotonic inference, and in brief, the good and well-founded semantics of common sense courses.

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This is the approach we have taken so far in Default Logic; it is a 'blind' search in the sense that it takes no advantage of the given goal to guide the search. There is a good reason why we have not taken the former approach so far: in general, a goal-driven approach is simply impossible! To illustrate this claim let us look at an example. Consider the default theory T = (W, D) with W = {p} and D = { 01, 02, 03} with £ _ 01- p : q £ _ ,02r r : s q £ _ ,03- true : true �q . Suppose we are interested in testing whether the formula s is supported by T.

L/Jl , . . 'l/Jn f:. In(II) = E ( because II is successful) . t. E. Therefore, X E AT(E) and In(II[k + 1]) � AT(E). Altogether, we have shown E = AT(E), so one direction of the theorem is proven. For the opposite direction, suppose E = AT(E). Consider an arbitrary fixed enumeration {�O, �1, } of D. In the following, we define a process II of T with the properties ( for all i such that II[i] is defined) . In(II[i]) � E Out(II[i]) n E = . 0 as follows: • Case 1: Every & E D which is applicable to In(II[i]) is already contained in II(i].

LikesCars 2- likesCars sh ows that T has exactly two e xtensions . This ex­ one another. A consequence is that there are two extensions which, taken togethe r, are inconsistent. 5 ample shows a situation where two defaults cont r ad i c t base. The examples discussed here show that a default theory may possess no n e , one or the b asi c concepts of Default L o gic in a satisfactory way. From now on, we shall not draw process trees when discussing several extensions. We hope to have illustrated examples The reader should consider it as a constant exercise to check the exam­ .

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Nonmonotonic Reasoning by Grigoris Antoniou

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