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,
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