Journal ArticleDOI
Powerset operator foundations for point-set lattice-theoretic (poslat) fuzzy set theories and topologies
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TLDR
This paper sets forth in detail point-set lattice-theoretic or poslat foundations of all mathematical and fuzzy set disciplines in which the operations of taking the image and pre-image of (fuzzy) subsets play a fundamental role; such disciplines include algebra, measure and probability theory, and topology.Abstract:
This paper sets forth in detail point-set lattice-theoretic or poslat foundations of all mathematical and fuzzy set disciplines in which the operations of taking the image and pre-image of (fuzzy) subsets play a fundamental role; such disciplines include algebra, measure and probability theory, and topology. In particular, those aspects of fuzzy sets, hinging around (crisp) powersets of fuzzy subsets and around powerset operators between such powersets lifted from ordinary functions between the underlying base sets, are examined and characterized using point-set and lattice-theoretic methods. The basic goal is to uniquely derive the powerset operators and not simply stipulate them, and in doing this we explicitly distinguish between the “fixed-basis” case (where the underlying lattice of membership values is fixed for the sets in question) and the “variable-basis” case (where the underlying lattice of membership values is allowed to change). Applications to fuzzy sets/logic include: development a...read more
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Book ChapterDOI
Categorical Foundations of Variable-Basis Fuzzy Topology
TL;DR: This chapter lays categorical foundations for topology and fuzzy topology in which the basis of a space—the lattice of membership values—is allowed to change from one object to another within the same category.
Book ChapterDOI
Powerset Operator Foundations For Poslat Fuzzy Set Theories And Topologies
TL;DR: Rodabaugh as mentioned in this paper summarizes the powerset operator foundations of all mathematical and fuzzy set disciplines in which the operations of taking the image and preimage of (fuzzy) subsets play a fundamental role; such disciplines include algebra, measure theory and analysis, and topology.
Journal ArticleDOI
Relationship of Algebraic Theories to Powerset Theories and Fuzzy Topological Theories for Lattice-Valued Mathematics
TL;DR: This paper answers the question to what extent is topology algebraic by giving necessary and sufficient conditions under which certain theories—the very ones generating powerset theories generating (fuzzy) topological theories in the sense of this paper—are algebraic theories, and these conditions use unital quantales.
Journal ArticleDOI
Order-theoretic, topological, categorical redundancies of interval-valued sets, grey sets, vague sets, interval-valued “intuitionistic” sets, “intuitionistic” fuzzy sets and topologies
TL;DR: This paper demonstrates two meta-mathematical propositions concerning the increasingly popular ''intuitionistic'' (= vague) approaches to fuzzy sets and fuzzy topology, as well as the closely related interval-valued (= grey) sets and intervals-valued ''intUitionists'' sets.
Journal ArticleDOI
Fuzzy complete lattices
Qi-Ye Zhang,Weixian Xie,Lei Fan +2 more
TL;DR: L-fuzzycomplete lattices are defined, which are generalizations of usual complete lattices and coincide with Wagner's complete and cocomplete @W-categories enriched over the frame L, and are consequently a special kind of complete@W-lattices defined by Lai and Zhang.
References
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Book
Fuzzy sets
TL;DR: A separation theorem for convex fuzzy sets is proved without requiring that the fuzzy sets be disjoint.
Book
Categories for the Working Mathematician
TL;DR: In this article, the authors present a table of abstractions for categories, including Axioms for Categories, Functors, Natural Transformations, and Adjoints for Preorders.
Journal ArticleDOI
L-fuzzy sets
TL;DR: This paper explores the foundations of, generalizes, and continues the work of Zadeh in [I] and [2].