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I'm writing a paper in which I have long eqnarrays, many of them 10 lines or longer. Since TeX seems to not want to page-break these equations, this results in weird formatting, eg pages that have large amounts of whitespace and not much actual text. Is there any way to force TeX to page-break eqnarray equations in a natural way?

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Welcome to TeX.SE. Here is a related question that might be helpful: custom alignment of columns in align environment – Peter Grill Jan 27 '12 at 18:10
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Don't use the eqnarray environment; instead, load the amsmath package and use its align environment. To allow page breaks, issue the statement \allowdisplaybreaks. – Mico Jan 27 '12 at 18:19

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Avoid eqnarray! Use the amsmath package and its align environment to replace eqnarray. The \allowdisplaybreaks command in the preamble of your document will enable page breaks within equation arrays.

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As \allowdisplaybreaks will allow page break after any line in a display environment, its use should be limited to document preparation; for the final version, suitably chosen \displaybreak commands should be used at the spots where page breaks are more convenient. – egreg Jan 27 '12 at 18:25
Just to add, with align, you specify only one & for each line, and it has to be on the left from the equals sign, like `\begin{align} f(x) &= x^2 \\ g(x) &= \sqrt x \end{align} – tohecz Jan 27 '12 at 18:31
Wow, thanks! That was fast. Okay, sounds good: I'll try the align environment. – Chuck Hague Jan 27 '12 at 18:46

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