Mathematics Teacher (1931) Vol. 24, No. 6

  • Mathematics Teacher (1931) Vol. 24, No. 6

    I THE MATHEMATICS TEACHER The Official Journal of The National Council of Teachers of Mathematics Incorporated 1928 OCTOBER 1 9 3 1 Contents )) Some Simple Logical Notions Encountered in Elementary MathematticsNecessary, Sufficient, and Necessary and Sufficient Condittion ... ....... .. ..................... . Carl A.