This Element provides clear and concise explanations of Wittgenstein's early criticisms of Russell's theory of judgment, which led to central features of Wittgenstein's Tractatus. It provides unfamiliar students with these issues an accurate and straightforward introduction. For specialists, it outlines some significant recent research.
Arthur Pap significantly influenced the analytic tradition, critiquing logical empiricism and exploring the limits of empiricism. His insights on intuitive knowledge of logic prefigure contemporary debates in philosophy, particularly in neo-Fregean mathematics and the metaphysics of modality, shedding new light on Kripke's arguments on necessity and apriority.