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Exotic affine space

Real affine space of even dimension that is not isomorphic to a complex affine space From Wikipedia, the free encyclopedia

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In algebraic geometry, an exotic affine space is a complex algebraic variety that is diffeomorphic to for some n, but is not isomorphic as an algebraic variety to .[1][2][3] An example of an exotic is the Koras–Russell cubic threefold,[4] which is the subset of defined by the polynomial equation

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