Mathematics – Differential Geometry
Scientific paper
1998-08-11
Mathematics
Differential Geometry
10 pages, Latex
Scientific paper
For a compact connected manifold M of dimension n greater than 3 and with no
metric of positive scalar curvature, we prove that the Yamabe invariant is
unchanged under surgery on spheres of dimension different from 1, n-2 and n-1.
We use this result to give new computations of the invariant in dimension four
and display new examples of 4-manifolds which do not admit Einstein metrics.
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