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Old 06-14-2018, 12:39 PM
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Gandalf Gandalf is offline
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When you write a double integral, the limits of the outer integral cannot depend on the variable of integration of the inner integral.

So you could make the outer integral covering x from 0 to 1, with the inner integral covering y from x to 1. Or the outer y from 0 to 1 and the inner x from 0 to y. Those give the same result.
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