Type: Article
Publication Date: 2005-10-31
Citations: 20
DOI: https://doi.org/10.1090/s0002-9947-05-03810-9
This paper solves in the affirmative, up to dimension $n=5$, a question raised in an earlier paper by the authors. The equivalence of the problem with a conjecture of Shou-Wu Zhang is proved in the Appendix.