Let $f:\mathbb R^2 \to \mathbb C$ be function.
Can we say that
$$\int_{[a,b]\times[c,d]} f(x) dx=\int_{[c,d]} \left(\int_{[a,b]} f(x_1, x_2) dx_1\right) dx_2$$?
2026-04-05 09:40:06.1775382006
How to justify product integral?
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