Английская Википедия:Almost symplectic manifold

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In differential geometry, an almost symplectic structure on a differentiable manifold <math>M</math> is a two-form <math>\omega</math> on <math>M</math> that is everywhere non-singular.[1] If in addition <math>\omega</math> is closed then it is a symplectic form.

An almost symplectic manifold is an Sp-structure; requiring <math>\omega</math> to be closed is an integrability condition.

References

Шаблон:Reflist Шаблон:Reflist

Further reading

Шаблон:Eom Шаблон:Manifolds Шаблон:Differential-geometry-stub