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This article (except the introduction and the afterwords) is my answer to one of the homework problems that I did when I took a quantum field theory course. The original problem asked to verify the formula for linear change of variables in integration. It was originally written on 2024-02-06. Introduction Although Grassmann numbers are purely mathematical concept, but like most people, I was introduced to them in physics class. I then had the natural question: how to formally define Grassmann n...