Mathematics Teacher (1936) Vol. 29, No. 8

  • Mathematics Teacher (1936) Vol. 29, No. 8

    THE MATHEMATICS TEACHER Volume XXIX Number 8 Edited by William David Reeve The Abstract and the Concrete in the Development of School Geometry* By DR. GEORG wOLFF Dusseldorf, Germany l. THE MENTAL D EVELOPMENTS OF EucLIDEAN GEOMETRY A. In Euclid's Elements AnouT 300 B.C. the Greek mathematiccia and philosopher, Euclid,