**Emily Grosholz** is Edwin Erle Sparks Professor of Philosophy at the Pennsylvania State University. She is the author of monographs on Descartes, Leibniz and the role of "productive ambiguity" in mathematics and the sciences. She edited a collection of essays on Leibniz, time and history, as a special issue of

*Studia Leibnitiana* (44 / 1 2012), as well as collection of essays on modern cosmology and time as a special issue of

*Studies in the History and Philosophy of Modern Physics* (52 / Part A 2015). Her new philosophy book

*Starry Reckoning: Reference and Analysis in Mathematics and Cosmology* is just out from Springer in the SAPERE series edited by Lorenzo Magnani. Next year, Springer will publish her book on poetry and mathematics,

*Great Circles: The Transits of Mathematics and Poetry* in a new series, Mathematics, Culture and the Arts, edited by Margerie Senechal, Jeremy Gray and Jed Buchwald.

*This talk is the third annual Calgary Mathematics & Philosophy Lecture, co-sponsored by PIMS, the Pacific Institute for the Mathematical Sciences, and Department of Philosophy and the **Department of Mathematics*. The Mathematics & Philosophy Lectures aim to introduce topics at the intersection of mathematics and philosophy to a general academic audience. The event is free & open to the public; a reception follows.