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Extensional Logic of Hyperintensions

  • Marie Duží
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7260)

Abstract

In this paper I describe an extensional logic of hyperintensions, viz. Tichý’s Transparent Intensional Logic (TIL). TIL preserves transparency and compositionality in all kinds of context, and validates quantifying into all contexts, including intensional and hyperintensional ones. The availability of an extensional logic of hyperintensions defies the received view that an intensional (let alone hyperintensional) logic is one that fails to validate transparency, compositionality, and quantifying-in. The main features of our logic are that the senses and denotations of (non-indexical) terms and expressions remain invariant across contexts and that our ramified type theory enables quantification over any logical objects of any order. The syntax of TIL is the typed lambda calculus; its semantics is based on a procedural redefinition of, inter alia, functional abstraction and application. The only two non-standard features are a hyperintension (called Trivialization) that presents other hyperintensions and a four-place substitution function (called Sub) defined over hyperintensions.

Keywords

Quantifying-in extensional/intensional/hyperintensional context transparency ramified type theory transparent intensional logic extensional logic of hyperintensions 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Marie Duží
    • 1
  1. 1.VSB-Technical University OstravaCzech Republic

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