Richard Routley/Sylvan (1935-1996), a New Zealand born philosopher, who was a research fellow at the Australian National University at the time of his death, rose to prominence for his work in the development of Relevance Logic, Deep Ecology and a revised and improved Meinongian ontology known as noneism.   An iconoclastic figure in Australian philosophy, Routley/Sylvan s legacy thrives in the views of students and colleagues worldwide. Dominic Hyde is an Honorary Senior Lecturer in Philosophy at The University of Queensland whose works include: Vagueness, Logic and Ontology (2008), and Eco-Logical Lives: the philosophical lives of Richard Routley/Sylvan and Val Routley/Plumwood (2014). He works in non-classical logic and environmental philosophy and in environmental conservation.

• Editors’ Preface.- Contributors.- Introduction – Mortensen.- Acknowledgements.- Chapter 8. The importance of not existing.- Chapter 9. The meaning of existence.- Chapter 10. The importance of nonexistent objects and of intensionality in mathematics and the theoretical sciences.- Chapter 11. Rudiments of noneist philosophies of mathematics and science.- Chapter 12. How the theory elaborated differs from other theories of objects in its theses and objectives.- Bibliography.- Supplementary Essays: Hallucination as perceiving nonexistent objects – Fujikawa.- Towards a feminist logic – Eckert and Donahue.- Index.

“This book contains the core of the application of noneism to ontology, in particular, to the ontology of mathematics and the sciences. It is a required reading for those interested in those fields … . Certainly, there is much to be learned by engaging with the discussion in the book, and Routley's short but useful discussions on the methodology of theory choice in logic and ontology deserve to be better known in the epistemology of logic and in current metaontology.” (Jonas Rafael Becker Arenhart, Mathematical Reviews, April, 2022)