ACM/IEEE Symposium on Logic in Computer Science

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Second Annual IEEE Symposium on

Logic in Computer Science (LICS 1987)

Paper: A Framework for Defining Logics (at LICS 1987)

Winner of the Test-of-Time Award in 2007
Authors: Robert Harper Furio Honsell Gordon D. Plotkin


The Logical Framework (LF) is a system for defining a wide class of logics. It is based on a general treatment of syntax, rules, and proofs in terms of a typed λ-calculus with dependent types. Syntax is treated in a style similar to, but more general than, Martin-Löf's system of arities. The trearment of the rules and proofs focuses on the notion of a judgement. Logics are encoded in the LF via a new principle, the judgement as types principle, whereby each judgement is identified with the type of its proofs. This allows for a smooth treatment of discharge and variable occurrence conditions and leads to a unifrom treatment of rules and proofs whereby rules are viewed as proofs of higher-order judgements and proof checking is reduced to type checking. An important benefit of our treatment of formal systems is that logic-independent tools such as proof editors and proof checkers can be constructed.


    author = 	 {Robert Harper and Furio Honsell and Gordon D. Plotkin},
    title = 	 {A Framework for Defining Logics},
    booktitle =  {Proceedings of the Second Annual IEEE Symposium on Logic in Computer Science (LICS 1987)},
    year =	 {1987},
    month =	 {June}, 
    pages =      {194--204},
    location =   {Ithaca, NY, USA}, 
    publisher =	 {IEEE Computer Society Press}

Last modified: 2022-10-3113:49
Sam Staton