Math 229 (sections 4 and 8) students: please see Blackboard for course information.

*Some papers and preprints:*

Remarks on a theorem of Amitsur

The
Golod-Shafarevich counterexample without Hilbert series
(with Amitai Regev)

A proof of Catalan's convolution formula

Counting symmetry classes of
dissections of a convex regular polygon (with Douglas Bowman)

Enumerating triangulations
by parallel diagonals

The central component of a triangulation

Triangulations with few ears: symmetry classes and disjointness (with
Andrei Asinowski)

A bijection between
triangulations and 312-avoiding permutations

*Contact:*

*Links:*

NIU Math