Zero-sets of near-symplectic forms
辛几何
2007-05-23 v2
摘要
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^+.
引用
@article{arxiv.math/0601320,
title = {Zero-sets of near-symplectic forms},
author = {Tim Perutz},
journal= {arXiv preprint arXiv:math/0601320},
year = {2007}
}
备注
19 pages, 2 figures; to appear in J. Symplectic Geometry. Expository changes in Sections 1 and 4; corrected mistake in the proof of what is now Prop. 1.5