User:Rolf Haag

Hauptstrasse 11, CH 4463 Buus, Switzerland Math Teacher retired, studied mathematics, history and philosophy in Basel(Switzerland) at university, teached in Liestal (Switzerland) in high-school mathematics and informatics, teached in the upper classes of several Rudolf Steiner-schools, totally teached mathematics over 35 years. Researching in symmetries of polygons since many years. Researching in symmetries of simple arrangements in projctive plane.