Mathematics Teacher (1970) Vol. 63, No. 8

  • 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