Normalization of singular contact forms and primitive 1-forms

Kai Jiang, Truong Hong Minh, Nguyen Tien Zung

A differential 1-form $\alpha$ on a manifold of odd dimension $2n+1$, which satisfies the contact condition $\alpha \wedge (d\alpha {)}^n\ne 0$ almost everywhere, but which vanishes at a point $O$,…