Fathoming Formal Logic
Vol II: Semantics and Proof Theory for Predicate Logic
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This text, volume II of a two-volume work, examines in depth the so-called "standard" predicate logic. Including a foundational lexicon of terms and a detour through the classical propositional logic, this volume can be used independently of the first. As a means toward teasing out theoretical subtleties and negotiating formal and philosophic challenges, this work uses detailed examples and exercises; because of this feature, the text can also be used to study formal logic in a rigorous fashion. Given its expressive power, predicate logic is deemed as minimally adequate for formalization of su...
This text, volume II of a two-volume work, examines in depth the so-called "standard" predicate logic. Including a foundational lexicon of terms and a detour through the classical propositional logic, this volume can be used independently of the first. As a means toward teasing out theoretical subtleties and negotiating formal and philosophic challenges, this work uses detailed examples and exercises; because of this feature, the text can also be used to study formal logic in a rigorous fashion. Given its expressive power, predicate logic is deemed as minimally adequate for formalization of such fundamental languages as that of Mathematics and for translations of the meanings of English (or other natural-language) sentences. Laying foundations in this area is key to a technical understanding of deductive reasoning and to honing rigorous critical thinking and problem-solving skills. Notable (some of them unusual) features that are covered in the present volume include the following: The overview of propositional logic includes positive semantic trees, in addition to the negative semantic tree method. Prenex forms and conversion to equivalent prenex forms. Relational (ultimately polyadic) predicate symbols, function symbols and identity are made available. The decision problem and the L¿wenheim Result are discussed. Proof-theoretic methods are presented analytically and extensive justifications are offered for the required restrictions on the deduction rules. The semantics of predicate logic modeling are presented in analytical detail along with inquiries into the logical-philosophical significance of predicate logic. Translation from English into the predicate logic idiom (formalization, symbolization) is examined thoroughly, accompanied by motivating linguistic observations and thorough scrutiny of available options; aspects of this inquiry include translations under restricted and unrestricted domains, translations of compacted predicates, rendering of non-classically quantified phrases, translations of numerical statements, definite descriptions and regimentation, and guidance on how to render existential presuppositions. Disambiguation is imposed on translations and an extensive list of examples is presented. Translations of idiomatic linguistic expressions are studied. Semantic tree decision procedures (for finitarian domains) - including negative and positive semantic tree systems - are constructed and applied. Appendices on Set Theory, Mathematical Induction and Dialogical Logic are presented.
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