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- Newsgroups: sci.math.num-analysis
- Path: sparky!uunet!elroy.jpl.nasa.gov!ucla-cs!ucla-ma!oak!cassorla
- From: cassorla@oak.math.ucla.edu (Mark Cassorla)
- Subject: Nonpositive curvature exercise
- Message-ID: <1992Dec30.232900.28439@math.ucla.edu>
- Sender: news@math.ucla.edu
- Organization: UCLA Mathematics Department
- Date: Wed, 30 Dec 92 23:29:00 GMT
- Lines: 10
-
- The following exercise appears in "Manifolds of Nonpositive Curvature".
- Any hints or solutions would be appreciated. (Note: This is the
- first exercise in the book so I think it is easily solved, but my
- head must be screwed in incorrectly.)
-
- Let S be a surface of genus>=2 and let V=SxS. If D is the diagonal
- in V and W is a 4-manifold that admits a local diffeo over V-D that
- is ramified at D, show that W admits no smooth metric of nonpositive
- curvature.
-
-