oriented differentiable structure

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• Simon Donaldson — Infobox Scientist name = Simon Kirwan Donaldson box width = image width = caption = birth date = birth date and age|1957|08|20 birth place = Cambridge, England death date = death place = residence = citizenship = nationality = flagicon|UK British …   Wikipedia

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• Diffeomorphism — In mathematics, a diffeomorphism is an isomorphism in the category of smooth manifolds. It is an invertible function that maps one differentiable manifold to another, such that both the function and its inverse are smooth. The image of a… …   Wikipedia