---
address: |
    University of Michigan\
    Department of Mathematics\
    Ann Arbor, MI 48109-1109
author:
- Michael Roitman
bibliography:
- '../vertex.bib'
- '../my.bib'
- '../general.bib'
- '../conformal.bib'
title: Invariant bilinear forms on a vertex algebra and the radical
---

Acknowledgments {#acknowledgments .unnumbered}
---------------

I thank Haisheng Li for inspiring discussions and for pointing out an inaccuracy in an earlier version of this paper.
