P.D. Magnus

Forallx: An Introduction to Formal Logic offers a rigorous, streamlined route from propositional logic to first-order quantification with identity, integrating proof theory and semantics at each step. Magnus treats symbolization, syntax, and consequence together, moving from truth tables and validity to natural-deduction proofs and simple model-theoretic ideas, with many worked examples and graded exercises.
The prose is lucid, the notation consistent, and the scope calibrated for an introductory course yet suitable for self-study. In today's open textbook landscape, it exemplifies a modular primer focused on core techniques rather than ornament. P. D. Magnus, a philosopher at the University at Albany (SUNY) whose research spans the philosophy of science and classification, brings long teaching experience and a commitment to open educational resources.
His aim to lower barriers to logic shaped a text released under an open license and iteratively improved through classroom use and community feedback. Ideal for introductory courses and disciplined self-study, this book equips readers to formalize arguments, construct and assess proofs, and read advanced work in logic and allied fields. A reliable, accessible, and remarkably teachable companion. Quickie Classics summarizes timeless works with precision, preserving the author's voice and keeping the prose clear, fast, and readable-distilled, never diluted.
Enriched Edition extras: Introduction · Synopsis · Historical Context · Brief Analysis · 4 Reflection Q&As · Editorial Footnotes.