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EqnPart of the troff suite of Unix document layout tools, eqn is a preprocessor that formats equations for printing. A similar program, neqn, accepted the same input as eqn, but produced output tuned to look better in nroff. The input language used by eqn allowed you to write math in much the same way you would speak it, and is very similar to the language used by TeX. For example, here's how some of the examples from http://meta.wikimedia.org/wiki/Help:Formula would be written in eqn: | TeX | eqn | formula |
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| a^2 | $a sup 2$ | | | \sum_{k=1}^N k^2 | $sum from k = 1 to n { k sup 2 } $ | | See Also The entry under troff is the main article.
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