Intuition behind the notion of reflection positivity

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Intuition behind the notion of reflection positivity

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I came across Yuji's question. I'm finding it difficult to parse the meaning behind what's said on Wikipedia. Could someone give an explanation of the concept involved? I would also appreciate references.

This post imported from StackExchange Physics at 2014-04-24 02:35 (UCT), posted by SE-user Siva

asked May 17, 2013 in Theoretical Physics by Siva (720 points) [ no revision ]

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