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In geometric mechanics a presymplectic form is a closed differential 2-form of constant rank on a manifold. However, some authors use different definitions...

{\displaystyle d\omega =0} , i.e. the 2-form is closed under the de Rham differential, i.e. is a presymplectic structure. A second class of examples arises...

ISBN 978-0-19-879489-9. Gotay, Mark J. (1982). "On coisotropic imbeddings of presymplectic manifolds". Proceedings of the American Mathematical Society. 84 (1):...