Math Encounters

Now offering FREE, online sessions!

Click here for FREE Math Encounters videos

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

“Fun with Fractals: Finding patterns in the chaos”

with Sarah Koch

Wednesday, May 5 at 4:00 pm and 7:00 pm ET (New York)

A dynamical system pairs a set with a rule that transforms the set.  Applying the rule over and over, or iterating the rule, often leads to remarkably beautiful objects that are called fractals.  Join mathematician Sarah Koch in an exploration of different kinds of dynamical systems and the fractals that emerge from each.  Along the way, meet many famous fractals including the Cantor set, the Sierpinski triangle, the Koch Snowflake, and several entertaining Julia sets.

Special introduction by Dr. John H. Hubbard, Professor of Mathematics, Cornell University.

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.