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Sep 17, 2011 at 10:08 vote accept fds
Sep 16, 2011 at 16:07 comment added M P Note that the assumption $C^2 < 0$ is superfluous: the integral curves $C$ satisfying $K \cdot C > 0$ must have negative square by the argument above.
Sep 16, 2011 at 15:49 history answered M P CC BY-SA 3.0