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We can flip between Minkowkian and Euclidean signature by Wick rotation, and it is a well defined operation, provided there are no non - trivial singularities.

Now, Unitarity in Minkowskian space corresponds to reflection positivity in the Euclidean signature. Does Causality in the Mikowskian space has a well defined and "useful" continuation to the Euclidean signature?

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