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摘要
In his article in Proc. Amer. Math. Soc. 138 (2010), no. 5, 1621-1632, S. Chang conjectures that a closed smooth manifold M with nonspin universal covering admits a metric of positive scalar curvature if and only if a certain homological condition is satisfied. We present a counterexample to this conjecture, based on the counterexample to the unstable Gromov-Lawson- Rosenberg conjecture given in the second author's article in Topology 37 (1998), no. 6, 1165-1168.
- 出版日期2015-7
