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math.DG2009
Elementary Surprises in Projective Geometry
Richard Evan Schwartz, Serge Tabachnikov
We discuss eight new(?) configuration theorems of classical projective geometry in the spirit of the Pappus and Pascal theorems.
math.DS2009
Quasiperiodic Motion for the Pentagram Map
Valentin Ovsienko, Richard Schwartz, Serge Tabachnikov
The pentagram map is a projectively natural iteration defined on polygons, and also on a generalized notion of a polygon which we call {\it twisted polygons}. In this note we descr…