Closed 1-forms with at most one zero
(2006)
Journal Article
Farber, M., & Schutz, D. (2006). Closed 1-forms with at most one zero. Topology (Oxford), 45(3), 465-473. https://doi.org/10.1016/j.top.2005.06.006
We prove that in any nonzero cohomology class ξH1(M;R) there always exists a closed 1-form having at most one zero.