Mathematics Teacher (1949) Vol. 42, No. 4

  • Mathematics Teacher (1949) Vol. 42, No. 4

    THE MATHEMATICS TEACHER Volume XLII Number 4 Edited by William David Reeve Operations in the Systems of Positive and Negative Numbers and Zero By HOWARD F. FEHR Teachers College, Columbia University New York 7, N. Y. DESPITE the ready accessibility of elementary proofs1 of the impossibility of the Euclidean trisection