Alexander

James Waddell Alexander

Born: 19 Sept 1888 in Sea Bright, New Jersey, USA
Died: 23 Sept 1971 in Princeton, New Jersey, USA

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James Alexander was a student of Veblen and studied mathematics and physics at Princeton, obtaining a B.S. degree in 1910 and an M.S. degree in 1911. In 1912 he joined the faculty of the mathematics department at Princeton.

Before 1920 he had shown that the homology of a simplicial complex is a topological invariant. Soon after arriving in Princeton Alexander generalised the Jordan curve theorem and, in 1928, he discovered the Alexander polynomial which is much used in knot theory.

From 1933 until he retired in 1951 he was a member of the Institute for Advanced Studies in Princeton.

References:

  1. Biography in Encyclopaedia Britannica
  2. L W Cohen, James Waddell Alexander, Bull. Amer. Math. Soc. 79 (1973), 900-903.
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