The most difficult part of this section for me is figuring out how the indices change when the order of summation is switched.
It seems weird switching summation so easily after all the carefulness of switching integrals and infinite sums. Clearly it is fine, since everything is finite. But apparently I have a built in warning sign about switching sums.
It seems weird switching summation so easily after all the carefulness of switching integrals and infinite sums. Clearly it is fine, since everything is finite. But apparently I have a built in warning sign about switching sums.
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