In mathematical physics, a Grassmann integral, or, more correctly, Berezin integral, is a way to define integration for functions of Grassmann variables. It is not an integral in the Lebesgue sense; it is called integration because it has analogous properties and since it is used in physics as a sum over histories for fermions, an extension of the path integral. The technique was invented by the Russian mathematician Felix Berezin and developed in his textbook. Some earlier insights were made by the physicist David John Candlin in 1956.
Read more about Grassmann Integral: Definition, Multiple Variables, Substitution Formula, Gaussian Integrals Over Grassmann Variables
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