GREGORY LANDINI Professor at the University of Iowa, USA. He is the author of Russell (2010), Wittgenstein's Apprentice with Russell (2007) and Russell's Hidden Substitutional Theory (1998). He has published articles in the philosophy of logic and metaphysics. His teaching and research interests include modal logic, the foundations of mathematics, philosophy of mind, philosophy of language, and the history of analytic philosophy.

• Series Editor's Foreword Preface Author's Note on the Use of Modern Logical Notations Abbreviations of Works by Gottlob Frege Introduction Frege's Basic Logics (without Wertverlaüfe ) The Ancestral Wertverlaüfe Analysis and Recomposition Engaging Problems References Further Reading Index