Clairaut, Alexis Claude

Clairaut, Alexis Claude älĕksĕs´ klōd klĕrō´ [key], 1713–65, French mathematician. He assisted P. L. M. de Maupertuis in measuring (1736) a degree of an arc of a meridian in Lapland. He is noted for his work on differential equations and on curves and for formulating Clairaut's theorem dealing with geodesic lines on the surface of an ellipsoid.

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