Wittgenstein played a vital role in establishing mathematics as one of this centurys principal areas of philosophic inquiry. In this book, Pasquale Frascolla examines the three phases of Wittgensteins reflections on mathematics, considering them as a progressive whole rather than as separate entities. Frascolla discusses the development of Wittgensteins views on mathematics from the Tractatus up to 1944. He looks at the presentation of arithmetic in the theory of logical operations, the presence of a strong verificationist orientation and the rule-following considerations in Wittgensteins writings. Frascolla identifies a unifying key-a quasi-formalism-to the development of Wittgensteins reflections on mathematics.