Deviant Logic, Fuzzy Logic by Susan Haack

Beyond the Formalism

This short book critically examines non-classical logics — including intuitionistic, relevance, paraconsistent, and fuzzy systems — analyzing the motivations, technical structures, and philosophical claims that prompt departures from classical logic. Through careful conceptual and historical analysis it asks whether these alternatives genuinely resolve the problems they are meant to address, explores consequences for notions of truth, meaning, vagueness, and inference, and cautions against conflating formal innovation with philosophical revolution. The overall stance favors a measured, context-sensitive assessment of alternative logics rather than their wholesale rejection or uncritical adoption.

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