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I want to show that $$\int \limits_{R^{n_1+n_2}}f = \int \limits_{R^{n_1}}\int \limits_{R^{n_2}} f(x, y) dy dx.$$ In essence, I am trying to get the result in Tonelli's theorem. I know this is probably simple but I am stumped and can't seem to get started. Any tips?

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