Get A Geometry of Approximation: Rough Set Theory: Logic, PDF

By Piero Pagliani

ISBN-10: 1402086210

ISBN-13: 9781402086212

'A Geometry of Approximation' addresses tough Set idea, a box of interdisciplinary examine first proposed by means of Zdzislaw Pawlak in 1982, and focuses ordinarily on its logic-algebraic interpretation. the speculation is embedded in a broader viewpoint that incorporates logical and mathematical methodologies referring to the idea, in addition to comparable epistemological concerns. Any mathematical process that's brought within the publication is preceded via logical and epistemological reasons. Intuitive justifications also are supplied, insofar as attainable, in order that the overall standpoint isn't lost.

Such an method endows the current treatise with a special personality. because of this distinctiveness within the therapy of the topic, the ebook should be beneficial to researchers, graduate and pre-graduate scholars from a variety of disciplines, comparable to machine technological know-how, arithmetic and philosophy. It beneficial properties a magnificent variety of examples supported by way of approximately forty tables and 230 figures. the excellent index of innovations turns the publication right into a kind of encyclopaedia for researchers from a couple of fields.

'A Geometry of Approximation' hyperlinks many components of educational pursuit with no wasting tune of its point of interest, tough Sets.

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Extra info for A Geometry of Approximation: Rough Set Theory: Logic, Algebra and Topology of Conceptual Patterns

Example text

Thus, in a sense, this separated perception has the same effect as adding a non void topological border between A and A ; therefore, recalling that −A ∩ −B(A) = I(−A) = ¬A, we can model this situation by means of the equations A = ¬A , A = ¬A (hence A = ¬¬A and A = ¬¬A). Henceforth, in our terminology, although they recognize that A and A are complementary figures in the universe B, nevertheless they are not able to apply the operation ¬¬ to the join A ∪ A (that is, A ∪ ¬A) in order to obtain B. Indeed Piaget registers that at this age α ∨ ¬α = 1, but he does not try to connect this particular failure of the excluded middle to the topological modeling of intuitionistic logic, to its related notion of a creative subject and to G¨ odel-Glivenko results such as ¬¬(α ∨ ¬α) = 1.

We do not know the color of B. We want to know if there is a green box near a non-green box. Using Classical Logic we can solve the problem: if B is green, then B is a green box near a non-green box, namely C. If B is not green, then A is a green box near a non-green box, namely B. Thus, the answer is “Yes”. According to Moore, here we use the following features: (a) the ability to prove that an existential predicate A(x) is true without knowing which term (“object”) t makes A(t) true; (b) the possibility to say that for any sentence A either A is true or ¬A is true; (c) the ability to reason by cases.

We prefer to interpret this process by saying that presheaves fulfill structural features that are shared by Intuitionistic Logic. Similarly, Boolean algebras have the same structure as (the Lindenbaum algebras of) Classical Logic and we shall see that in the framework of Rough Set Theory, Boolean algebras are used to model complete information systems, in contrast with three-valued algebras which in the same framework model incomplete information systems. Nonetheless, it can not be claimed that Classical Logic is the logic of complete information.

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A Geometry of Approximation: Rough Set Theory: Logic, Algebra and Topology of Conceptual Patterns by Piero Pagliani


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