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Getting Stuff On Top of Other Stuff

If you want to make a fraction, use the \frac command; \frac works on everything contained in a pair of curly brackets, or the entire equation if there is no enclosing pair of curly brackets.

Here's an example:

$$\lim_{\delta\rightarrow 0}\frac{f(x+\delta) 
        - f(x)}{\delta}$$


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