Wick made fundamental contributions to quantum field theory, such as the Wick theorem in 1950, which showed how to express calculations in quantum field theory in terms of normally-ordered products and thus derive Feynman rules.[1] He also introduced the Wick rotation, in which computations are analytically continued from Minkowski space to four-dimensional Euclidean space using a coordinate change to imaginary time.
https://en.wikipedia.org/wiki/Gian_Carlo_Wick
Btw I remained seated and silent during the pledge part if class in Ithaca, NY. My perfect right as an Austrian in their country.
And I'm informed MC Hawking liked imaginary time.
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