# textit - undefined control sequence

I got a problem using \textit{}. The error which occurs is

"Undefined control sequence".

It occurs in a formula.

\texitit{P}_{int} = \int_{V^r} \textbf{\textit{P}}^{i+1} : \dot{\textbf{\textit{F}}}^{i+1} dV^r .


How can I solve this problem?

• Welcome to TeX.SX! If you do not want to get rid of that typo (for whatever reason), you can put \newcommand*{\texitit}[1]{\textit{#1}} in your preamble. But I guess, it was not meant to be an own command but is just a single typo as shown in Justin's answer. – LaRiFaRi Dec 10 '14 at 13:42

Your first P has a \texitit rather than \textit. Notice the extra i`?