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umbilical point
Sign in to savelocally spherical point on a mathematical surface
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vector field
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Jean Gaston Darboux
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International Standard Book Number
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navel
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sphere
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digital object identifier
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torus
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Euclidean space
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bibcode
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Q118398
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Euler characteristic
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Q22908627
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Konstantinos Carathéodory
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Jacobian matrix
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Ian Stewart
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genus
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Mathematical Reviews
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Gaussian curvature
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catastrophe theory
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cusp
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