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Veblen made important contributions to projective and differential geometry, and topology.
Veblen taught mathematics at Princeton University from 1905 to 1932. In 1932 he helped organise the Institute for Advanced Study in Princeton and became a professor there in 1932.
His interest in the foundations of geometry led to his work on the axiom systems of projective geometry. Together with John Wesley Young he published Projective geometry (1910-18). Veblen's Analysis Situs (1922) provided the first systematic coverage of the basic ideas of topology and contributed to the development of modern topology.
Soon after Einstein's theory of general relativity appeared Veblen turned his attention to differential geometry. This work led to important applications in relativity theory, and much of his work also found application in atomic physics. His work The invariants of quadratic differential forms (1927) is a systematic treatment of Riemann geometry while his work, written jointly with his student Henry Whitehead, The foundations of differential geometry (1933) gives the first definition of a differentiable manifold.
In Projective relativity theory (1933) he gave a new treatment of spinors, used to represent electron spin.
Veblen played a key role in the setting up of the mathematics department at the Institute for Advance Study at Princeton.
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Tell me about Veblen's work on the four colour theorem and on mathematical games and recreations
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