Zero-sets of near-symplectic forms

Details Zero-sets of near-symplectic forms Zero-sets of near-symplectic forms

2006-01-13

arxiv.org/abs/math/0601320v2

Mathematics

Symplectic Geometry

19 pages, 2 figures; to appear in J. Symplectic Geometry. Expository changes in Sections 1 and 4; corrected mistake in the pro

Scientific paper

We give elementary proofs of two `folklore' assertions about near-symplectic forms on four-manifolds: that any such form can be modified, by an evolutionary process taking place within a finite set of balls, so as to have a prescribed positive number of zero-circles; and that, on a closed manifold, the number of zero-circles for which the splitting of the normal bundle is trivial has the same parity as 1+b_1+b_2^+.

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