Decomposability of the Finitely Generated Free Hoop Residuation Algebra

Studia Logica 88 (2):233-246 (2008)
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Abstract

In this paper we prove that, for n > 1, the n-generated free algebra in any locally finite subvariety of HoRA can be written in a unique nontrivial way as Ł2 ×  A′, where A′ is a directly indecomposable algebra in . More precisely, we prove that the unique nontrivial pair of factor congruences of is given by the filters and , where the element is recursively defined from the term introduced by W. H. Cornish. As an additional result we obtain a characterization of minimal irreducible filters of in terms of its coatoms.

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A Syntactic Proof Of A Conjecture Of Andrzej Wronski.Tomasz Kowalski - 1994 - Reports on Mathematical Logic:81-86.

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