This book provides a detailed and comprehensive account of the problem of a priori knowledge from a historical as well as a systematic perspective. The author explores Kant's views in connection with the possibility of revision, something hardly, if at all, done in philosophical literature. Furthermore, the views of well-renowned philosophers such as Quine, Putnam, Kitcher, and Hale are discussed in detail and are put into a historical and systematic perspective. Finally, this book contains a glossary of important notions offering illuminating accounts of a priori knowledge and related notions and explains the relationship between a priori knowledge, fallibility and revision. The detailing of concepts such as 'defeasibility', 'infallibility', 'falsifiability' helps anyone reading philosophical literature to pin down the meaning of the terms and its implications in this context. The enriched and dual approach the author takes makes the book a very useful and lucid guide to the problem of a priori knowledge.

What is the relationship between ontology and modality - between what there is, and what there could be, must be, or might have been? Bob Hale interwove these two strands of metaphysics throughout his long and distinguished career, putting forward his theses in his book, Necessary Beings: An Essay on Ontology, Modality, and the Relations Between Them (OUP 2013). Hale addressed questions of ontology and modality on a number of fronts: through the development of a Fregean approach to ontology, an essentialist theory of modality, and in his work on neo-logicism in the philosophy of mathematics. The essays in this volume engage with these themes in Hale's work in order to progress our understanding of ontology, modality, and the relations between them. Some directly address questions in modal metaphysics, drawing on ontological concerns, while others raise questions in modal epistemology and of its links to matters of ontology, such as the challenge to give an epistemology of essence. Several essays also engage with questions of what might be called 'modal ontology': the study of whether and what things exist necessarily or contingently. Such issues have an important bearing on the kinds of semantic commitments engendered in logic and mathematics (to the existence of sets, or numbers, or properties, and so on) and the extent to which one's ontology of necessary beings interacts with other plausible assumptions and commitments.

This book provides a detailed and comprehensive account of the problem of a priori knowledge from a historical as well as a systematic perspective. The author explores Kant’s views in connection with the possibility of revision, something hardly, if at all, done in philosophical literature. Furthermore, the views of well-renowned philosophers such as Quine, Putnam, Kitcher, and Hale are discussed in detail and are put into a historical and systematic perspective. Finally, this book contains a glossary of important notions offering illuminating accounts of a priori knowledge and related notions and explains the relationship between a priori knowledge, fallibility and revision. The detailing of concepts such as ‘defeasibility’, ‘infallibility’, ‘falsifiability’ helps anyone reading philosophical literature to pin down the meaning of the terms and its implications in this context. The enriched and dual approach the author takes makes the book a very useful and lucid guide to the problem of a priori knowledge.