Hassler Whitney

Hassler Whitney (March 23, 1907 – May 10, 1989) was an American mathematician. He was one of the founders of singularity theory, and did foundational work in manifolds, embeddings, immersions, and characteristic classes.

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Hassler Whitney - Work - Research
... Whitney's earliest work, from 1930 to 1933, was on graph theory ... Whitney's lifelong interest in geometric properties of functions also began around this time ... In a 1936 paper, Whitney gave a definition of a smooth manifold of class C r, and proved that, for high enough values of r, a smooth manifold of dimension n may be embedded in ℝ2n+1, and immersed in ℝ2n ...