Currently studying the complexity of natural numbers in various simple computational models, and occasionally unusual operations on ordinals. See website for more.
27 Are all $p$-adic number systems the same? Jul 24 '12
18 Basic counterexample re: preimages of ideals Oct 28 '10
13 Entire function with $f(z)=\sin(f(z))$ must be constant? Dec 15 '11
6 Number of real roots of a separable real polynomial doesn't change under small perturbations Sep 12 '11