This is a reconstruction of Henri Poincare's anti-realist philosophy of mathematics. Although Poincare is recognized as the greatest mathematician of the late 19th century, his contribution to the philosophy of mathematics is not generally highly regarded. Poincare criticized logicism and axiomatic set theory, and he argued that we have mathematical intuitions. Many regard his remarks as idiosyncratic, and based upon a misunderstanding of logic and logicism. This book argues that Poincare's critiques are not based on misunderstanding. Rather, they are grounded in a coherent and attractive foundation of neo-Kantian constructivity.

This book is a sympathetic reconstruction of Henri Poincar's anti-realist philosophy of mathematics. Although Poincar is recognized as the greatest mathematician of the late 19th century, his contribution to the philosophy of mathematics is not highly regarded. Many regard his remarks as idiosyncratic, and based upon a misunderstanding of logic and logicism. This book argues that Poincar's critiques are not based on misunderstanding; rather, they are grounded in a coherent and attractive foundation of neo-Kantian constructivism.