Mathematics Teacher (1923) Vol. 16, No. 1
THE MATHEMATICS TEACHER YoLnrE XYI JANUARY, 1923 NUMBER 1 'l'IJE EXTENSION OF CONCEPTS IN MATTIEMATICS 1 By AUBREY J. KEMPN~R University or Illinois Tlle subject which I wish to outline in the briefest manner is the old problem of introducing into Algebra and Geometry such concepts as, for example, irrational numbers,
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