added pointer to

- Misha Verbitsky,
*Holomorphic symplectic geometry and orbifold singularities*, Asian J. Math. 4 (2000), no. 3, 553-563 (arXiv:math/9903175)

I have added to *symplectic manifold* a brief paragraph *Symplectic and almost symplectic structure*.

There are some prefactors of $\frac{1}{2}$ that I should straighten out. But not tonight.

]]>I have expanded symplectic manifold a little

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