Table of Contents

Mathematics

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  A UNIFIED THEORY OF GENERAL RELATIVITY OF GRAVITATION AND ELECTROMAGNETISM

  Luther P. Eisenhart

  PNAS May 1, 1956 42 (5) 249-251; https://doi.org/10.1073/pnas.42.5.249
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  INVARIANT DIFFERENTIAL OPERATORS ON A SEMISIMPLE LIE ALGEBRA

  Harish-Chandra

  PNAS May 1, 1956 42 (5) 252-253; https://doi.org/10.1073/pnas.42.5.252
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  HARMONIC ANALYSIS FOR CERTAIN SEMIGROUPS

  Edwin Hewitt and Herbert S. Zuckerman

  PNAS May 1, 1956 42 (5) 253-255; https://doi.org/10.1073/pnas.42.5.253
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  ABSTRACT HOMOTOPY. II

  Daniel M. Kan

  PNAS May 1, 1956 42 (5) 255-258; https://doi.org/10.1073/pnas.42.5.255
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  ON DIFFERENTIAL GEOMETRY AND HOMOGENEOUS SPACES. I

  Bertram Kostant

  PNAS May 1, 1956 42 (5) 258-261; https://doi.org/10.1073/pnas.42.5.258
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  IMPLICIT FUNCTION THEOREM FOR QUASI-ANALYTIC AND RELATED CLASSES OF FUNCTIONS

  T. P. G. Liverman

  PNAS May 1, 1956 42 (5) 261-264; https://doi.org/10.1073/pnas.42.5.261
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  ON DIOPHANTINE EQUATIONS WHICH HAVE NO SOLUTIONS

  J. L. Selfridge, C. A. Nicol, and H. S. Vandiver

  PNAS May 1, 1956 42 (5) 264-266; https://doi.org/10.1073/pnas.42.5.264
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  A GENERALIZATION OF THE PONTRJAGIN SQUARE COHOMOLOGY OPERATION

  Emery Thomas

  PNAS May 1, 1956 42 (5) 266-269; https://doi.org/10.1073/pnas.42.5.266