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$$\mu$$MV-algebras: An approach to fixed points in Łukasiewicz logic. (English) Zbl 1183.06006
Chang introduced MV-algebras to give a purely algebraic proof of the completeness of the Łukasiewicz axioms. In his paper [J. Funct. Anal. 65, 15–63 (1986; Zbl 0597.46059)], the present reviewer established a categorical equivalence between MV-algebras and unital lattice-ordered abelian groups. Divisible MV-algebras are the correspondents of divisible unital lattice-ordered abelian groups. By further equipping a divisible MV-algebra with the well-known $$\Delta$$-operator, one has divisible MV$$_\Delta$$-algebras. The author proves that by expanding MV-algebras to structures allowing minimal and maximal fixed points, one obtains a term-equivalent variant of divisible MV$$_\Delta$$-algebras. He then derives various kinds of results on these algebras, such as subdirect representation, completeness, amalgamation and a representation of free algebras. For background on MV-algebras see the monograph [R. L. O. Cignoli, I. M. L. D’Ottaviano and D. Mundici, Algebraic foundations of many-valued reasoning. Dordrecht: Kluwer Academic Publishers (2000; Zbl 0937.06009)].

##### MSC:
 06D35 MV-algebras 03B50 Many-valued logic 03G25 Other algebras related to logic
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