Mathematics Teacher (1970) Vol. 63, No. 8
NATIONAL COUNCIL OF TEACHERS OF MATHEMATICS DECEMBER 1970 VOLUME LXIII. NUMBER 8 Strategies of Proof in Secondary Mathematics Henry Van Engen Factor Lattices Margaret J. Kenney A Space to Live In Roy Daniells The Early Beginnings of Set Theory PhiUip E. J ohnson Introducing: Math that students can handle! Activities In
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