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I think the best explanation why is given in my #18. Your objection in #30 does not make much sense when ##dx## is not viewed as a right bracket.martinbn said:This was already pointed out, but it doesn't explain the choice. You say they are the same, but in some cases you prefer ##dxf(x)##. I am simply curious why.
Could you be more specific about that? What kind of integral do you have in mind? If you talk about Grassmann/Berezin integral, there ##d\eta## cannot be interpreted as an infinitesimal at all.martinbn said:How about integrals not in the sense of Riemann? There the infinitesimals that commute is not very meaningful.