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
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