# Homework Help: Interval of Integration Symbol

1. Sep 13, 2009

### omegacore

Latex Question:

I am having a hell of a time finding how to put the large vertical bar used to denote the interval over which a definite integral should be evaluated. Can you please help me?

2. Sep 13, 2009

### D H

Staff Emeritus
Usually you put those with the integral sign:

\int_A^B f(x)\, dx

$$\int_A^B f(x)\, dx$$

Once you have evaluated the corresponding indefinite integral you need to evaluate it at the integration limits to determine the value of the definite integral.

\left.F(x)\right|_A^B

$$\left.F(x)\right|_A^B$$

The trick is to use an invisible \left part (\left.) paired with a visible vertical bar \right part (\right|).

An alternate approach is to use big honkin' elements. Getting bigr and Bigr and biggr and Biggr,

F(x)\bigr|_A^B, F(x)\Bigr|_A^B, F(x)\biggr|_A^B, F(x)\Biggr|_A^B

$$F(x)\bigr|_A^B$$

$$F(x)\Bigr|_A^B$$

$$F(x)\biggr|_A^B$$

$$F(x)\Biggr|_A^B$$

3. Sep 13, 2009

### omegacore

Thank you very much! It looks great!

I was very surprised this wasn't actually detailed somewhere already. In my searching I also learned about the cancel package, which you can use to show expressions canceling to zero or one or whatever!