A.R. meets Doron Zeilberger

Gainesville 1999

A. Tefera, D. Zeilberger, C. Dunkl, and A.R.
From left to right: Akalu Tefera, Doron Zeilberger (with a bottle of water), Charles Dunkl, A.R.

Minneapolis 2002

C. Schneider, D. Zeilberger, F. Chyzak, O. Scherzer, P. Paule, and A.R.
From left to right: Carsten Schneider, Doron Zeilberger, Frédéric Chyzak, Othmar Scherzer, Peter Paule, A.R.