By Francesco Paoli

Substructural logics are via now essentially the most fashionable branches of the study box frequently labelled as "nonclassical logics" - and maybe of good judgment tout court. over the past few many years an unlimited volume of analysis papers or even a few books were dedicated to this topic. the purpose of the current ebook is to provide a accomplished account of the "state of the paintings" of substructural logics, focusing either on their evidence idea (especially on sequent calculi and their generalizations) and on their semantics (both algebraic and relational).
Readership: This textbook is designed for a large readership: graduate scholars in both philosophy, arithmetic, theoretical machine technological know-how or theoretical linguistics without past wisdom of the topic (except for a operating wisdom of ordinary common sense) might be steadily brought into the sector ranging from its uncomplicated foundations; experts and researchers within the quarter will locate an up to date survey of crucial present examine themes and problems.

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But what would be the intuitive interpretation of the resulting calculi? Classical and intuitionistic sequents, after all, reflect two analyses of deducibility which are by now well-understood; are we in a position to replace them by concepts which are just as sound? In the following, we shall analyze the classical and the intuitionistic readings of sequents and suggest two alternative readings, neither of which supports the plausibility of all the structural rules. 1. The truth·based reading Both in his Investigations into Logical Deduction and in his The Consistency of Elementary Number Theory, Gentzen devotes a few lines to the explanation of the intuitive meaning of his sequents.

There are several grounds, indeed, for refraining from such a move. For example, the setting up of an algebraic semantics would become a rather desperate enterprise. g. Dosen 1988; see also Restall 2000). Even Lambek calculus has been given a nonassociative version (Lambek 1961). 3. WAYS OF READING A SEQUENT Summing up the preceding discussion, we have seen that there exist good reasons to drop one or more of the structural rules devised by Gentzen for his calculi LK and LJ. But what would be the intuitive interpretation of the resulting calculi?

In Chapter 3 we shall see two concrete examples, concerning cut elimination and the search for decision algorithms, which justify the previous assertion. One of the reasons of this lies in the fact that, even if contraction rules do not delete fornmlae from a proof like the cut rule, they may nonetheless delete from it some formula occurrences, and this complicates enormously the process of proof search. 5. Reasons for dropping the exchange rules Proceeding in our review of the weak spots of structural rules, there comes now the turn of exchange rules.

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