Improve latex equation output
- in the general latex tabulation, use a minipage instead of a \nopagebreak; the latter only prevents page breaks at once location, but does nothing about page-breaks in the title that appears right before it (so half the equation could end up at the bottom of a page/column, and the other half at the top of the next page/column). Putting the whole thing in a minipage fixes that. - Don't put a \n before the equation: under latex, it becomes a \\, but the \\ is in an invalid location and generates "no line to end here" errors.
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