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In philosophy of mathematics, he and his Harvard colleague Hilary Putnam developed the Quine–Putnam indispensability thesis, an argument for the reality of mathematical entities. [11]Quine, W. V. (1961). From a Logical Point of View: Nine Logico-Philosophical Essays, Second Revised Edition. Harper torchbooks. Harvard University Press. pp.22–23, 28. ISBN 978-0-674-32351-3. Kapelner, Zsolt-kristof (2015). "3. Quinean Metaontology". Reconciling Quinean and neo-Aristotelian Metaontology (PDF). Concepts in an unconceptualized reality are not more than language. Their purpose is pragmatic. The ultimate duty of language, science and philosophy is efficacy in communication and prediction.