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## LΠ logic with fixed points

Author: Luca Spada

Abstract: We study a system, μLΠ, obtained by an expansion of LΠ logic with fixed points connectives.  The first main result of the paper is that μLΠ is standard complete, i.e. complete with regard to the unit interval of real numbers endowed with a suitable structure. We also prove that the class of algebras which forms algebraic semantics for this logic is generated, as a variety, by its linearly ordered members and that they are precisely the interval algebras of real closed fields. This correspondence is extended to a categorical equivalence between the whole category of those algebras and another category naturally arising from real closed fields. Finally, we show that this logic enjoys implicative interpolation.

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### One Comment

• […] an expansion of (rm L {rmPifrac{1}{2}}) logic with fixed points has been considered. In the present work we study the algebraic semantics of this logic, namely (mu LPi) algebras, […]