This volume represents an important contribution to Peirce's work in mathematics and formal logic. An internationally recognized group of scholars explores and extends understandings of Peirce's most advanced work. The stimulating depth and originality of Peirce's thought and the continuing relevance of his ideas are brought out by this major book. NATHAN HOUSER is Director and General Editor of the Peirce Edition Project and Associate Professor of Philosophy at Indiana University, Indianapolis. He is co-editor of The Essential Peirce. DON D. ROBERTS is Professor of Philosophy at the University of Waterloo, Ontario, and Chairman of the Board of Advisors to the Peirce Edition Project. He is the author of Logical Fragments and The Existential Graphs of Charles S. Peirce. JAMES VAN EVRA is Associate Professor of Philosophy at the University of Waterloo, Ontario.