Teaching & Administration:

1. ✤ I am on sabbatical during Spring 2013.
   

2. ✤ Summer 2013:
   

3. ✴ Math 1252DE. Calculus for social & management science:  Distance Learning, CRN 70345, 70993.
   

4. ✤ Fall 2013 courses:
   

5. ✴ Math 4981. Seminar: An introduction to cryptography and codes,  CRN 56668.
   

6. ✴ Math 6214. Measure and Integration Theory (Graduate course),
   CRN 56669.

Research:

1. ✴ My research is on ergodic theory and dynamical systems, especially the application of these subjects to tilings, quasicrystals, and numeration. See my papers and old lectures lectures for more details.
   

2. ✴I am also interested in applications of mathematics to politics. Click on the image of my book (left) coauthored with Dan Ullman, for more information.

Current Ph.D. Students:

1. ✤Joe Herning
   

2. ✤Erblin Mehmetaj

This animation shows the tiling substitution producing the “chair” tiling. It is an example of a constant “size” substitution with a “coincidence”. As a result this tiling has discrete diffraction spectrum. See the paper

“On the table
and the chair”  
Indag. Math 10,

1999.