Mathematics Teacher (1919-1920) Vol. 12, No. 2

  • Mathematics Teacher (1919-1920) Vol. 12, No. 2

    THE M ATHEMATICS T EACHER EDITED BY W. H. METZLER ASSOCIATED WITH EUGENE R. SMITH HARRY D. GAYLORD GEO. GAILEY CHAMBERS WILLIAM E. BRECKENRIDGE V OLUME XII D ECEMBER, 1919 NUMBER 2 CERTAIN UNDEFINED ELEMENTS AND TACIT ASSUMPTIONS IN THE FIRST BOOK OF EUCLID'S ELEMENTS.* Bv H ARRISON E. WEBB. For twenty-one centuries th