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The code from above works when I put it in its own separate document. In the document I am working on, it doesn't work. I did a little copying and pasting into a new doc, and now everything seems happy. So, moral of the story, it now works, but I have no idea why.

Thanks for the help!

I have already loaded amsmath and amssymb in the document.

For some reason, I cannot get the /begin{cases} command to compile my sequence with cases correctly. I have looked on many different resources and have tried many different "minor tweakings", but my brace will not extend to both lines. It just remains center on the first line. Here is one of the ...