Arthur Sard

Arthur Sard (28 July 1909, New York City – 31 August 1980, Basel) was an American mathematician, famous for his work in differential topology and in spline interpolation. His fame stems primarily from Sard's theorem, which says that the set of critical values of a differential function which has sufficiently many derivatives has measure zero. He was a member of the first faculty members at the then newly founded Queens College, where he worked from 1937 to 1970.

Sard retired as professor emeritus in 1970 at Queens College and then worked at La Jolla, where he spent five years as a research associate in the mathematics department of the University of California, San Diego. In 1975 he went to Binningen near Basel and taught at various European universities and research institutes. In 1978 he accepted an invitation from the Soviet Academy of Sciences to be a guest lecturer. In 1978 and 1979 he was a guest professor at the University of Siegen. Arthur Sard died on 31 August 1980 in Basel.

Works Sard published thirty-eight research articles and the two following monographs: Arthur Sard: Linear approximation. 2nd edn. American Mathematical Society, Providence, Rhode Island 1963, (Mathematical Surveys and Monographs. Vol. 9). Arthur Sard, Sol Weintraub: A Book of Splines. John Wiley & Sons Inc, New York 1971,

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