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Sep 22, 2016 at 18:06 comment added dxiv The question was deliberately underspecified as to not exclude more general answers. Any answer to "are there known sufficient conditions" could of course include restrictions such as number of fixed points, continuity etc. Thanks for the proposed example.
Sep 22, 2016 at 6:25 review First posts
Sep 22, 2016 at 6:30
Sep 22, 2016 at 6:24 history answered J. M. CC BY-SA 3.0