This book presents a philosophical conception of logic - "logical expressivism"- according to which the role of logic is to make explicit reason relations, which are often neither monotonic nor transitive. It reveals new perspectives on inferential roles, sequent calculi, representation, truthmakers, and many extant logical theories.

Ulf Hlobil is Associate Professor of Philosophy at Concordia University. His publications include "Limits of Abductivism About Logic" (2020) and G.E.M. Anscombe: Aufsätze (2014, with Katharina Nieswandt).

Robert B. Brandom is Distinguished Professor of Philosophy at the University of Pittsburgh. His books include Making It Explicit (1994), Between Saying and Doing (2008), and A Spirit of Trust (2019). He is a Fellow of the American Academy of Arts and Sciences and of the British Academy.

Introduction: Metavocabularies of Reason 1. A Pragmatic Metavocabulary 2. Logical Expressivism and the Open Structure of Reasons 3. Introducing Logical Vocabulary: Making Reason Relations Logical 4. Truth-Taking and Truth-Making: How They Share a Rational Form 5. Implication-Space Semantics: Content as Implicational Role 6. Conclusion Epilogue: A Speculative Synthesis