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the world > relative properties > number > mathematics > [noun] > mathematical enquiry > result of > in specific case (2)
saddle point1907

(a) a point at which a curved surface is locally level but at which its curvature in two directions differs in sign, i.e. for a surface defined by…

Poincaré cycle1943

a single circuit of a simple closed curve in the phase space of a system, representing one possible solution of the governing differential equations.

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