Английская Википедия:Contact type

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Шаблон:Short description In mathematics, more precisely in symplectic geometry, a hypersurface <math>\Sigma </math> of a symplectic manifold <math>(M,\omega)</math> is said to be of contact type if there is 1-form <math>\alpha</math> such that <math>j^{*}(\omega)=d\alpha</math> and <math>(\Sigma,\alpha)</math> is a contact manifold, where <math> j: \Sigma \to M </math> is the natural inclusion.Шаблон:Sfnm The terminology was first coined by Alan Weinstein.

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Шаблон:Differential-geometry-stub