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This question already has an answer here:

When I type \alpha my list get crazy...What I am doing wrong?

\documentclass[a4paper,12pt]{article}
\pagestyle{empty}
\usepackage{color}
\usepackage{ifxetex}
\ifxetex\usepackage{fontspec}\setmainfont[Ligatures=TeX]{CMU Serif}
  \def\Hello{Welcome! \fontspec{WenQuanYi Micro Hei} 你好!}
\else\usepackage[utf8]{inputenc}\usepackage[T2A]{fontenc}
  \def\Hello{Welcome!}
\fi

\begin{document}

\begin{enumerate}
\item{bla bla bla (\alpha , Q) bla bla blabla bla bla};
\item bla bla bla (\alfa, Q);
\item bla bla blabla bla blabla bla blabla bla bla
\end{enumerate}
\end{document}

Thanks.

marked as duplicate by Werner, egreg lists Oct 11 '15 at 22:21

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1

This is because you need to place \alpha in math mode:

enter image description here

\documentclass{article}

\begin{document}

\begin{enumerate}
  \item bla bla bla $(\alpha, Q)$ bla bla blabla bla bla};
  \item bla bla bla $(\alpha, Q)$;
  \item bla bla blabla bla blabla bla blabla bla bla
\end{enumerate}

\end{document}

Note that there is no \alfa, unless you define it (say) using

\let\alfa\alpha

in your preamble.

1

do you have tried using $\alpha $?

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