MATHEMATICA BOHEMICA, Vol. 131, No. 1, pp. 39-48, 2006

# Modal operators on MV-algebras

## Magdalena Harlenderova, Jiri Rachunek

M. Harlenderova, AZD Praha s.r.o., VaV Olomouc, Smetanova 29, 779 00 Olomouc, Czech Republic, e-mail: harlenderova.magdalena@azd.cz; J. Rachunek, Department of Algebra and Geometry, Faculty of Sciences, Palacky University, Tomkova 40, 779 00 Olomouc, Czech Republic, e-mail: rachunek@inf.upol.cz

Abstract: Modal operators on Heyting algebras were introduced by Macnab. In this paper we introduce analogously modal operators on MV-algebras and study their properties. Moreover, modal operators on certain derived structures are investigated.

Keywords: MV-algebra, modal operator, closure operator, residuated $\ell$-monoid, Heyting algebra

Classification (MSC 2000): 06D35, 06D25, 06F05

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