Abstract
Click to increase image sizeClick to decrease image size Additional informationNotes on contributorsHans WalserHans Walser (hwalser@bluewin.ch) received his Ph.D. from the ETH (Swiss Federal Institute of Technology) Zurich in 1975. He is a teacher at the State College of Thurgau and lecturer at the ETH Zurich and the University of Basel. His primary research interests are in geometry. He is also engaged in projects to improve mathematical teaching in Germany.
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