Dr Simon B. Duffy

B.Pharm, B.A. (Hons) Syd, D.E.A Paris-X, PhD Syd

Senior Lecturer, Humanities (Philosophy), Yale-NUS College, Singapore.
Acting Head of Studies, Philosophy

Biographical Information

Simon received a PhD in philosophy at the University of Sydney (2003), after a Diplôme d’Etudes Approfondies (M.Phil equivalent) in philosophy at the Université de Paris X-Nanterre (1999).

He has taught at the University of Sydney, the University of New South Wales and the University of Queensland, where he was a Postdoctoral Fellow in Philosophy & the Centre for the History of European Discourses. Prior to joining Yale-NUS, he was an ARC Postdoctoral Research Fellow in the Department of Philosophy at the University of Sydney.

Abstracts and links to online copies of a number of his journal articles, books and reviews of them are available via Philpapers.

Research Interests

Simon’s main areas of research are in early modern philosophy, modern and contemporary European philosophy, and the history and philosophy of science.

Selected Publications


2013. Deleuze and the History of Mathematics: in defense of the new, London: Bloomsbury Academic, 2013.

ReviewsNotre Dame: Philosophical Reviews, 2014.02.03 [Aden Evens, Dartmouth] [link]

2012. (ed.) Badiou and Philosophy, eds Simon B. Duffy and Sean Bowden, Edinburgh: Edinburgh University Press, 2012.

ReviewsNotre Dame: Philosophical Reviews, 2013.03.27 [Frank Ruda, Freie Universität, Berlin] [link]

2011. (trans.) Lautman, Albert. Mathematics, Ideas and the Physical Real, trans. Simon B. Duffy, London: Continuum [Les mathématiques, les idées et le réel physique. Paris: Vrin, 2006.]

Reviews: 1) Philosophia Mathematica (2013) 21 (3): 411-416 [Pierre Cassou-Noguès, Université de Paris 8] [link]; 2) Notre Dame: Philosophical Reviews, 2012.01.19 [Anastasios Brenner, Université Paul Valéry-Montpellier III] [link]

2006. The Logic of Expression: quality, quantity and intensity in Spinoza, Hegel and Deleuze, Aldershot: Ashgate, 2006.

Reviews: European Journal of Philosophy 17, no .2, (2009): 341-45 [Phillip Turetzky, Colorado State]

2006. (ed.) Virtual Mathematics: the logic of difference, ed. Simon B. Duffy, Manchester: Clinamen Press, 2006.

Reviews: 1)  Australasian Journal of Philosophy 86, no. 2 (2008): 332-336 [Colin McLarty, Case Western]; 2) Cahiers Critiques de Philosophie 3 (2007): 224-229 [Alexis de Saint-Ours, Université de Paris 7].

 Journal Articles

2018. ‘Lautman on problems as the conditions of existence of solutions,’ Angelaki: journal of the theoretical humanities, Special Issue ‘Problematizing the “Problem” in 20th Century French Thought’. [Forthcoming]

2017. ‘Models, mathematics and Deleuze’s philosophy: a reply to Williams’ [Williams, James, ‘Models, mathematics and Deleuze’s philosophy: some remarks on Simon Duffy’s Deleuze and the History of Mathematics: in Defence of the New,’ (in same issue)]  Deleuze Studies Journal. [Forthcoming.]

2014. ‘Maimon’s theory of differentials as the elements of intuitions,’ International Journal of Philosophical Studies 22, no. 2 (2014): 228-247.

2010. ‘Deleuze, Leibniz and projective geometry in the Fold,’ Angelaki. Journal of the Theoretical Humanities 15, no. 2 (2010): 129-147.

2009. ‘The role of mathematics in Deleuze’s critical engagement with Hegel,’ International Journal of Philosophical Studies 17, no. 4 (2009): 463-482.

2009. ‘Spinoza today: the current state of Spinoza scholarship,’ Intellectual History Review 19, no. 1 (2009): 111-132.

2006. ‘The differential point of view of the infinitesimal calculus in Spinoza, Leibniz and Deleuze,’ Journal of the British Society for Phenomenology 37, no. 3 (2006): 286-307.

2006. ‘The difference between science and philosophy: the Spinoza-Boyle controversy revisited,’ Paragraph: A Journal of Modern Critical Theory 29, no. 2 (2006): 115-138.

2004. ‘Schizo-Math. The logic of different/ciation and the philosophy of difference,’ Angelaki. Journal of the Theoretical Humanities 9, no. 3 (2004): 199-215.

2004. ‘The Logic of Expression in Deleuze’s Expressionism in Philosophy: Spinoza. A strategy of engagement,’ International Journal of Philosophical Studies 12, no. 1 (2004): 47-60.

 Book Chapters

2017. ‘Deleuze and the conceptualizable character of mathematical theories,’ What is a mathematical concept? edited by Elizabeth de Freitas,
Nathalie Sinclair, and
 Alf Coles, Cambridge: Cambridge University Press. [Forthcoming]

2017. ‘Proportion as a barometer of the affective life in Spinoza,’ Spinoza’s Philosophy of Ratio, Edited by Beth Lord, Edinburgh: Edinburgh University Press. [Forthcoming]

2016. ‘Deleuze, Spinoza and the Question of Reincarnation in the Mahāyāna Tradition,’ Deleuze and Buddhism, eds Tony See and Joff Bradley, London: Palgrave Macmillan. 2016.

2015. ‘Deleuze and the pragmatist priority of subject naturalism,’ Deleuze and Pragmatism, eds Sean Bowden and Simone Bignall, London: Routledge, 2015.

2014. ‘Bordas-Demoulin, Maimon, Wronski and the philosophy of difference,’ Deleuze in China: Proceedings of the 2012 Kaifeng International Deleuze Conference, ed. Jihai Gao, Paul Patton and Jing Yin, Kaifeng: Henan University Press, 2014.

2012. ‘The question of Deleuze’s Neo-Leibnizianism,’ Down by Law: Revisiting Normativity with Deleuze, edited by Rosi Braidotti and Patricia Pisters, London: Continuum, 2012.

2012. ‘Badiou’s Platonism: the Mathematical Ideas of Post-Cantorian Set-Theory,’ Badiou and Philosophy, eds Simon B. Duffy and Sean Bowden, Edinburgh: Edinburgh University Press, 2012.

2011. ‘The role of “joyful passions” in Spinoza’s theory of relations,’ Spinoza Now, ed. Dimitris Vardoulakis, Minneapolis: Minnesota University Press, 2011.

2010. ‘French and Italian Spinozism,’ After Poststructuralism – Transitions and Transformations. The History of Continental Philosopy, Vol. 7, ed. Rosi Braidotti, Gen. ed. Alan D, Schrift, Chicago: University of Chicago Press, 2010. Reprinted 2013.

2010. ‘Leibniz, Mathematics and the Monad,’ Deleuze and The Fold. A Critical Reader, eds Niamh McDonnell and Sjoerd van Tuinen, Hampshire: Palgrave Macmillan, 2010.

2009. ‘Deleuze and the Mathematical Philosophy of Albert Lautman,’ Deleuze’s Philosophical Lineage, eds Graham Jones, Jon Roffe, Edinburgh: Edinburgh University Press, 2009.

2007. ‘The Ethical View of Spinoza’s theory of relations,’ Sensorium: Aesthetics, Art, Life, eds B. Bolt, F. Colman, G. Jones, A. Woodward, Newcastle upon-Tyne: Cambridge Scholars Press, 2007.

2006. ‘Deleuze and Mathematics,’ Virtual Mathematics: the logic of difference, ed. Simon B. Duffy, Manchester: Clinamen Press, 2006.

2006. ‘The Mathematics of Deleuze’s differential logic and metaphysics,’ Virtual Mathematics: the logic of difference, ed. Simon B. Duffy, Manchester: Clinamen Press, 2006.


2011. Zalamea, Fernando. ‘Albert Lautman and the Creative Dialectic of Modern Mathematics,’ in Albert Lautman. Mathematics, Ideas and the physical real, trans. Simon B. Duffy, London: Continuum, 2011. [‘Albert Lautman et la dialectique créatrice des mathématiques moderns,’ in Lautman, Albert, Les mathématiques, les idées et le réel physique. Paris: Vrin, 2006].

2009. [with Paul Patton] Matheron, Alexandre. ‘Spinoza and Sexuality,’ Feminist Interpretations of Benedict de Spinoza, ed. Moira Gatens, University Park: Pennsylvania State University Press, 2009. [‘Spinoza et la sexualité,’ Giornale Critico della Filosofia Italiana 8, no. 4 (1977): 436-57].

2006. Badiou, Alain. ‘Mathematics and Philosophy,’ Virtual Mathematics: the logic of difference, ed. Simon B. Duffy, Manchester: Clinamen Press, 2006. [‘Philosophie et mathématiques,’ 2003].

2006. Châtelet, Gilles. ‘Interlacing the singularity, the diagram and the metaphor,’ Virtual Mathematics: the logic of difference, ed. Simon B. Duffy, Manchester: Clinamen Press, 2006. [L’entrelacement de la singularité, du diagramme et de la métaphore, 1999. Unpublished Manuscript. Forthcoming in Les Enjeux du mobile, Vol. 2, ed. Charles Alunni, Paris: Éditions-Rue d’Ulm].

2006. [with Stephen W. Sawyer] Alunni, Charles. ‘Continental Genealogies. Mathematical confrontations in Albert Lautman and Gaston Bachelard,’ Virtual Mathematics: the logic of difference, ed. Simon B. Duffy, Manchester: Clinamen Press, 2006. [‘Albert Lautman et le souci brisé du mouvement,’ Revue de synthèse 5, no. 2 (2005): 283-301].

2003. Deleuze, Gilles. sur Spinoza (Seminars given between 1971 and 1987 at the Université Paris VIII Vincennes and Vincennes St-Denis), ed. Timothy S. Murphy, URL <http://www.webdeleuze.com>: 09 December 1980, 12 December 1980; 21 December 1980, 20 January 1981, 10 March 1981.

Selected Conference Papers

2017, ‘Deleuze, mathematics and the nature of problems,’ Seminar School of Mathematics & School of Humanities, Universiti Sains Malaysia, Penang, 23 February 2017.

2016, ‘La transformation des relations dans la métaphysique de Spinoza,’ Colloque International Spinoza France États-Unis, Université Paris 8, Vincennes Saint-Denis & Université Paris 1, Panthéon-Sorbonne, Paris, 3-4 June 2016.

2015, ‘Lautman on problems as the conditions of existence of solutions,’ Problems in 20th century French thought, Deakin University, Australia, 10 December 2015.

2015, ‘Deleuze and the conceptualizable character of mathematical theories,’ Daughters of Chaos: Practice, Discipline, A Life, 8th International Deleuze Studies Conference, Stockholm, Sweden, 29 Jun – 1 July 2015.

2015, ‘Mathematics as fiction in Spinoza and Deleuze ,’ Workshop on Spinoza and Fiction, University of Sydney, Australia, 5 June, 2015.

2015, ‘Proportion as a barometer of the affective life in Spinoza,’ Spinoza and Proportion Conference, University of Aberdeen, Scotland, May 5-6, 2015.

2014. ‘Tolerance, pragmatism and mathematics,’ Logic, Mathematics and Philosophy, Purdue University, USA, 19-20 September 2014. Plenary speaker.

2014. ‘Deleuze, Carnap and Subject Naturalism,’ Second Singapore Workshop on Integrated History and Philosophy of Science in Practice, Nanyang Technological University, Singapore, 19-20 Aug 2014.

2014, ‘Deleuze, Spinoza and the question of reincarnation in the Mahayana tradition,’ Deleuze’s Cultural Encounters with the New Humanities, Hong Kong Shue Yan University, 9‐12 June, 2014.

2014, ‘Deleuze and the metaphysics of the calculus,’ The 2nd International Deleuze Studies in Asia Conference, Osaka University, Japan, 6-8 June 2014.

2013, ‘A deflationary account of Deleuze’s metaphysics,’ Australasian Association of Philosophy Annual Conference, University of Queensland & Bond University, Australia, 7-12 July 2013.

2013, ‘The difference between formal and informal mathematical models in the work of Deleuze and Badiou,’ Center for Diagrammatic and Computational Philosophy, Endicott College, MA, USA, 26 April 2013.

2012, ‘Deleuze, Price and the pragmatist priority of subject naturalism,’ Deleuze, Pragmatism and Post-Kantian Thought Conference, Deakin University, Australia, 17-18 December 2012.

2012, ‘Bergson on the distinction between mechanical explanation as a method or as a doctrine,’ Australasian Association of Philosophy Annual Conference, University of Wollongong, Australia, 1-6 July 2012.

2012, ‘Bordas-Demoulin, Maïmon, Wronski and the philosophy of difference,’ Kaifeng International Deleuze Conference, Henan University, Kaifeng, China, May 20-21, 2012.

2012, ‘Are Deleuze’s metaphysical commitments simply forgettable in the name of pragmatism?’ Encountering the Author: Paul Patton, Deleuzian Concepts: Philosophy, Colonization, Politics (Stanford University Press, 2010), with Paul Muldoon (Monash), Anthony Uhlmann (University of Western Sydney), Sabrina Achilles (University of Western Sydney), Paul Patton (University of New South Wales), University of Western Sydney, 1 May 2012.

2011, ‘Deleuze and Badiou on Lautman’s concept of the Mathematical Real,’ Combined Seminar for the Faculty of Arts & Humanities and the School of Economics, Politics and Tourism, University of Newcastle, Australia, 23 Sep 2011.

2011. ‘The practical and ethical limitations of Libertarian approaches to pharmaceutical distribution and availability,’ Centre for Values, Ethics and the Law in Medicine (VELiM), University of Sydney, 28 July 2011.

2011. ‘The “vindication” of Leibniz’s account of the differential. A response to Somers-Hall,’ Australasian Association of Philosophy Annual Conference, Otago University, New Zealand, 3-8 July 2011.

2011. ‘What, if anything, do we learn from Maimon’s critique of Kant’s approach to mathematics? Kant and Maimon on the concept of the straight line,’ SHAPE Seminar, University of Sydney, 10 Jun 2011.

2011. ‘Deleuze, Maimon and the scienticity polemic,’ Encountering the Author: Beth Lord’s Kant and Spinozism: Transcendental Idealism and Immanence from Jacobi to Deleuze (Palgrave, 2010), with Andrew Benjamin (Monash University) and Beth Lord (University of Dundee), University of Western Sydney, 19 May 2011.

2010. ‘The question of Deleuze’s Neo-Leibnizianism,’ The Third International Deleuze Studies Conference, Utrecht University, Netherlands, 12-14 July, 2010. Keynote Address.

2010. ‘The metaphysical importance of mathematical speculation in Leibniz and Deleuze,’ Australasian Association of Philosophy Annual Conference, University of New South Wales, July 2010.

2010. ‘Leibniz’s mathematical approach to natural philosophy and its metaphysical foundations,’ Leibniz WorkshopMelbourne School of Continental Philosophy, University of Melbourne, 16 April 2010.

2009. ‘Overcoming the limits of Leibniz’s metaphysics: Deleuze on in/compossibility,’ The Second International Deleuze Studies Conference, University of Cologne, Germany, 8-10 August, 2009.

2009. ‘Deleuze and Lautman’s Philosophy of Mathematical Genesis,’ New French Thought Conference, Villanova University, USA, 3-4 April 2009.

2009. ‘Deleuze’s differential account of Leibniz’s theory of compossibility,’ Department of Philosophy Seminars, University of Memphis, USA, 23 January 2009.

2008. ‘The metaphysics of openness in Deleuze’s approach to science and mathematics,’ Deleuze2008: Deleuze in the Open, Stavanger: European Capital of Culture, Norway, 7-8 November, 2008. Keynote Address.

2008. ‘Deleuze and Lautman on mathematics as a model,’ The First International Deleuze Studies Conference, Cardiff University, UK, 11-13 August, 2008.

2008. ‘Mathematics as model in Deleuze’s philosophy of difference,’ Analytic versus Continental, Rapprochement? A mini-conference, La Trobe University, Australia, 11-13 July, 2008.

2007. ‘Deleuze and the mathematical philosophy of Albert Lautman,’ Centre for Research in Modern European Philosophy Research Seminars, Middlesex University, UK, 7 June 2007.

2006. ‘The Ethical View of Spinoza’s theory of relations,’ Koncepte der Macht: Spinoza und die Moderne, Berlin-Brandenburgische Akademie der Wissenschaften, Germany, 29 September – 1 October 2006.

2006. ‘The role of “joyful passions” in Spinoza’s theory of relations,’ Wandering with Spinoza, Victorian College of the Arts, Australia, 13-15 September 2006.

Public Forums

2010. ‘The Universal Genius – Gottfried Leibniz,’ The Philosopher’s Zone (ABC Radio, with Prof. Paul Redding), 24 April 2010. [link]