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for Antiderivative we write something like this:F\mid_{b}^{a} but it doesn't look like it should. I want to have the indices a and b at the same position as they were at an Integral \int_a^b

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You also have \left. F \right|^a_b for suppressing the left delimiter but keeping the right |. – percusse May 19 '12 at 10:05
That looks exactly like F\mid_a^b. – waXve May 19 '12 at 10:08
You may be looking for something like F\bigm|_a^b or F\Bigm|_a^b. – Mico May 19 '12 at 10:13
That's what I'm looking for. If you post this as answer, I'll flag it as the solution ;-) – waXve May 19 '12 at 10:18
up vote 5 down vote accepted

The \mid macro does not let you adjust the height of the resulting "pipe" or vertical bar. To obtain taller vertical bars, while preserving the nice spacing before and after the symbol, use either F\bigm|_a^b or F\Bigm|_a^b.

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