An Axiomatic Theory for Partial Functions

Jan Kuper

    Research output: Contribution to journalArticleAcademicpeer-review

    4 Citations (Scopus)
    154 Downloads (Pure)


    We describe an axiomatic theory for the concept of one-place, partial function, where function is taken in its extensional sense. The theory is rather general; i.e., concepts such as natural number and set are definable, and topics such as non-strictness and self application can be handled. It contains a model of the (extensional) lambda calculus, and commonly applied mechanisms (such as currying and inductive definability) are possible. Furthermore, the theory is equi-consistent with and equally powerful as ZFC Set Theory. The theory (called (Axiomatic Function Theory, AFT) is described in the language of classical first order predicate logic with equality and one non-logical symbol for function application. By means of some notational conventions, we describe a method within this logic to handle undefinedness in a natural way.
    Original languageEnglish
    Pages (from-to)104-150
    Number of pages47
    JournalInformation and computation
    Issue number1
    Publication statusPublished - Nov 1993


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