POWERSET OPERATOR FOUNDATIONS FOR CATALG FUZZY SET THEORIES
Publish place: Iranian Journal of Fuzzy Systems، Vol: 8، Issue: 2
Publish Year: 1390
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_IJFS-8-2_002
تاریخ نمایه سازی: 7 تیر 1401
Abstract:
The paper sets forth in detail categorically-algebraic or catalg foundations for the operations of taking the image and preimage of (fuzzy) sets called forward and backward powerset operators. Motivated by an open question of S. E. Rodabaugh, we construct a monad on the category of sets, the algebras of which generate the fixed-basis forward powerset operator of L. A. Zadeh. On the next step, we provide a direct lift of the backward powerset operator using the notion of categorical biproduct. The obtained framework is readily extended to the variable-basis case, justifying the powerset theories currently popular in the fuzzy community. At the end of the paper, our general variety-based setting postulates the requirements, under which a convenient variety-based powerset theory can be developed, suitable for employment in all areas of fuzzy mathematics dealing with fuzzy powersets, including fuzzy algebra, logic and topology.
Keywords:
(Backward , forward) powerset (operator , theory) , (Bi , co) product , (Composite) (variety-based) topological (space , system) , (Convenient) variety , Ground category , (L-) fuzzy set , (Localic) algebra , Monadic (category , logic) , Ordered category , Pointed category , Quantaloid , (Semi-) quantale , (Unital) (quantale , ring) (algebra , module) , Zero (morphism , object)
Authors
Sergey A. Solovyov
Department of Mathematics, University of Latvia, Zellu iela ۸, LV-۱۰۰۲ Riga, Latvia and Institute of Mathematics and Computer Science, University of Latvia, Raina bulvaris ۲۹, LV-۱۴۵۹ Riga, Latvia
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