Logic, Logics, and Logicism

Abstract
The paper starts with an examination and critique of Tarski’s wellknown proposed explication of the notion of logical operation in the type structure over a given domain of individuals as one which is invariant with respect to arbitrary permutations of the domain. The class of such operations has been characterized by McGee as exactly those definable in the language L∞,∞. Also characterized similarly is a natural generalization of Tarski’s thesis, due to Sher, in terms of bijections between domains. My main objections are that on the one hand, the Tarski-Sher thesis thus assimilates logic to mathematics, and on the other hand fails to explain the notion of same logical operation across domains of different sizes. A new notion of homomorphism invariant operation over functional type structures (with domains M0 of individuals and {T, F} at their base) is introduced to accomplish the latter. The main result is that an operation is definable from..
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DOI 10.1305/ndjfl/1039096304
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Isomorphism Invariance and Overgeneration.Owen Griffiths & A. C. Paseau - 2016 - Bulletin of Symbolic Logic 22 (4):482-503.
Logical Operations and Invariance.Enrique Casanovas - 2006 - Journal of Philosophical Logic 36 (1):33 - 60.
Modal Logic and Invariance.Johan Van Benthem & Denis Bonnay - 2008 - Journal of Applied Non-Classical Logics 18 (2-3):153-173.

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