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Originally Posted by Profpat have complementary opposites |
In quantum mechanics it is the principle of complementarity that is playing a key role but not in general relativity. See
http://en.wikipedia.org/wiki/Complementarity_(physics)
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Originally Posted by Profpat concave vs convex, opposing sides or lines |
Concavity and convexity and lines lose their meaning in higher dimensional descriptions which is described as compactness or connectivity of topological manifolds.