Math Encounters

Now offering FREE, online sessions!

Math Encounters is MoMath’s popular free public presentation series celebrating the spectacular world of mathematics, produced with support from the Simons Foundation.  For further information, call the National Museum of Mathematics at 212-542-0566 or email

Next up

“Breaking Up Is Hard To Do: The Art of Decomposition”

with Jordan Ellenberg

Wednesday, December 2 at 4:00 pm and 7:00 pm ET (New York)

Among the most fundamental tasks of mathematics (or science) is to classify in order to understand what kinds of things there are in the world.  A particularly satisfying form of classification is when we can show that every complicated thing is built out of a much smaller set of simpler things.  In chemistry, we get this satisfaction from the periodic table; in mathematics, we find it just about everywhere, from numbers to polynomials to curved surfaces.  Take a tour of some of these “periodic tables” of mathematics with mathematician Jordan Ellenberg and join us as together we explore the surprising relationships among them.

Special introduction by Alex Kontorovich, MoMath’s 2020-2021 Distinguished Visiting Professor for the Public Dissemination of Mathematics and Rutgers math professor.

This is a live-streamed event.  Occasional video recordings are made available for a fee at

Register for the 4:00 pm session
Register for the 7:00 pm session

Photography notice

By registering for a Math Encounters presentation, you agree that you may be photographed or videotaped by Museum staff and associates.

Books by the speakers

We are happy to offer books edited or authored by Math Encounters speakers through our online shop.

Math Encounters available on YouTube and DVD

Math Encounters presentations are generally posted to our YouTube page within 1-2 months of filming.  Due to copyright issues, some presentations may not be reproduced on the internet.  Presentations posted online are also available for purchase via our online shop.  Click here to purchase yours today!

Previous Math Encounters presentations

Presented by the Simons Foundation and the National Museum of Mathematics

Please note that all children under the age of 16 must be accompanied by an adult.