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Normal Forms and CutFree Proofs as Natural Transformations
 in : Logic From Computer Science, Mathematical Science Research Institute Publications 21
, 1992
"... What equations can we guarantee that simple functional programs must satisfy, irrespective of their obvious defining equations? Equivalently, what nontrivial identifications must hold between lambda terms, thoughtof as encoding appropriate natural deduction proofs ? We show that the usual syntax g ..."
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What equations can we guarantee that simple functional programs must satisfy, irrespective of their obvious defining equations? Equivalently, what nontrivial identifications must hold between lambda terms, thoughtof as encoding appropriate natural deduction proofs ? We show that the usual syntax guarantees that certain naturality equations from category theory are necessarily provable. At the same time, our categorical approach addresses an equational meaning of cutelimination and asymmetrical interpretations of cutfree proofs. This viewpoint is connected to Reynolds' relational interpretation of parametricity ([27], [2]), and to the KellyLambekMac LaneMints approach to coherence problems in category theory. 1 Introduction In the past several years, there has been renewed interest and research into the interconnections of proof theory, typed lambda calculus (as a functional programming paradigm) and category theory. Some of these connections can be surprisingly subtle. Here we a...
Labeled deduction in the composition of form and meaning
 IN H.J. OHLBACH & U. REYLE (EDS.) LOGIC, LANGUAGE AND REASONING. ESSAYS IN HONOR OF DOV GABBAY, PART I
, 1999
"... In the late Fifties, Jim Lambek has started a line of investigation that accounts for the composition of form and meaning in natural language in deductive terms: formal grammar is presented as a logic — a system for reasoning about the basic form/meaning units of language and the ways they can be pu ..."
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In the late Fifties, Jim Lambek has started a line of investigation that accounts for the composition of form and meaning in natural language in deductive terms: formal grammar is presented as a logic — a system for reasoning about the basic form/meaning units of language and the ways they can be put together into wellformed structured configurations. The reception of the categorial grammar logics in linguistic circles has always been somewhat mixed: the mathematical elegance of the original system ([Lambek 58]) is counterbalanced by clear descriptive limitations, as Lambek has been the first to emphasize on a variety of occasions. As a result of the deepened understanding of the options for ‘substructural ’ styles of reasoning, the categorial architecture has been redesigned in recent work, in ways that suggest that mathematical elegance may indeed be compatible with linguistic sophistication. A careful separation of the logical and the structural components of the categorial inference engine leads to the identification of constants of grammatical reasoning. At the level of the basic rules of use and proof for these constants one finds an explanation for the uniformities in the composition of form and meaning across languages. Crosslinguistic variation in the realization of the formmeaning correspondence is captured in terms of structural inference packages, acting as plugins with respect to the base logic of the grammatical
GRAMMATICAL STRUCTURES AND LOGICAL DEDUCTIONS CONTENTS
, 1995
"... 2. Formal grammars as deductive systems ..."
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