2

it might be a stupid question but I cannot see where the mistake is in this code:

\documentclass[12pt]{article}

\usepackage{amssymb}

\renewcommand{\baselinestretch}{1.5}
\setlength{\topmargin}{0cm}
\setlength{\oddsidemargin}{0cm}
\setlength{\leftmargin}{0cm}
\setlength{\textwidth}{16cm}
\setlength{\textheight}{21cm}
\renewcommand{\hoffset}{1cm}
\renewcommand{\voffset}{1cm}

\begin{document}

\begin{equation}
H_{0}:\rho_{1}<0\text{ and }\rho_{2}>0
\end{equation}
$vs$
\begin{equation}
H_{A}:\rho _{1}\geqslant 0\text{and/or}\rho _{2}\leqslant 0.  \label{12}
\end{equation}

\end{document}

I got an error message saying "Undefined control sequence". Can someone help me? Thanks in advance.

  • 1
    What's the rest of the message? It should indicate which command it doesn't recognise. (See the image at the top this answer which shows an undefined control sequence error followed by the debugging information.) – Nicola Talbot Jun 18 '16 at 12:32
3

The undefined control sequence is \text, which is defined by package amstext, which is automatically loaded by amsmath. Thus, the minimal

\usepackage{amstext}

or the more powerful

\usepackage{amsmath}

fixes the issue.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.