10,329 reputation
14673
bio website vmm.math.uci.edu
location Univ. of California at Irvine
age 83
visits member for 4 years, 4 months
seen Nov 14 at 16:05
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 .

Apr
26
awarded  Good Answer
Apr
20
awarded  Necromancer
Apr
20
comment Which hard mathematical problems do you have to solve to earn bitcoins ?
Is it known whether there is an algorithm using a quantum computer (i.e., qubits instead of bits) for simplifying the Bitcoin mining?
Apr
19
answered What are the invariant Pseudo-differential operators on a Lie group?
Apr
19
revised Great mathematics books by pre-modern authors
corrected misspelling
Apr
19
answered Great mathematics books by pre-modern authors
Apr
18
awarded  Nice Answer
Apr
17
answered Is rigour just a ritual that most mathematicians wish to get rid of if they could?
Apr
15
answered Old books still used
Apr
11
revised Fixed point theorems
A more general example
Apr
11
comment Fixed point theorems
...has a unique solution, provided ε is sufficiently small.
Apr
10
answered Fixed point theorems
Apr
9
awarded  Civic Duty
Mar
27
awarded  Nice Answer
Feb
6
awarded  Enlightened
Feb
6
awarded  Nice Answer
Jan
13
comment Lie group action with no slice
@Yves Cormulier I don't think that's so Yves. If it were then even a compact group action wouldn't have a slice at an isolated fixed point p, whereas in fact an invariant neighborhood of p is a slice at p in that case.
Jan
13
revised Lie group action with no slice
added 22 characters in body
Jan
13
comment Lie group action with no slice
After thinking about my answer a bit I realized that an even simpler example is the action of the group Z of integers on the circle generated by rotation through an irrational angle.
Jan
13
answered Lie group action with no slice