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?

| improve this answer | |
  • woooow... and I was searching for hours...thank you! – cag Dec 10 '14 at 13:39
  • @cag the full tex error message (which you did not show) tells you the line in the file and the point on the line where the undefined command is. – David Carlisle Dec 10 '14 at 14:08

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