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579

answers:

1
+6  A: 

\DeclareMathOperator (or, if you're using some weird distribution of LaTeX that doesn't have the AMS packages, \mathop{\mathrm{Erfi}})

See the always-useful UK TeX FAQ, specifically Defining a new log-like function in LaTeX.

ShreevatsaR
That works for me! Thanks.
bowenthebeard