I'm a Professor at UC Irvine, but spent most of my career at Brandeis. My research areas: Differential Topology, Transformation Groups, and Global Analysis. Recently I developed a math visualization program, 3D-XplorMath, freely available at http://3D-XplorMath.org) and a companion website, the Virtual Math Museum at http://VirtualMathMuseum.org. Last year I co-authored a differential equations text with my son Bob, most of which is downloadable from http://ode-math.com .
103 About a letter by Richard Palais of 1965. aug 15 '12
53 Theorems that are 'obvious' but hard to prove jan 9 '11
47 What is the situation with Hilbert's Fifth Problem ? jul 11 '10
38 Extremely messy proofs oct 27 '10
33 Is “Cartan's magic formula” due to Élie or Henri? sep 21 '10