0
\newpage

\section*{Basics}
\begin{definition} [\textsc{Pochhammer}-Symbol]
        The \textsc{Pochhammer-Symbol} with $(a;q)_n$
         is an expression in combinatorics, which is defined as 
    \begin{cases}
            (a;q)_n:=\prod_{k=0}^{n-1}(1-aq^k)  & \text{$k>0$} \\\\[2ex]
                        (a;q)_0=1  & \text{$k=0$}
        \end{cases}
        The symbol also.....
\end{definition}

Hello, I want to write my Bachelor thesis and need help at the beginning :´D There are three things , which drive me crazy:

I get the error : Missing $ inserted \begin{cases} Missing $ inserted \end{cases}

how can I solve it ?

My defintion appears as "Definition 0.1" but I would like 1.1, can I solve it, without nummering the chapter ?

I want my chapter in the center and tried "centering" which didn't work. Which command do I have to use here ?

1
  • 1
    Welcome to tex.sx. That's not a section sign in the error; it's a dollar sign, and means that the cases environment has to be embedded in a math environment. This should probably be displayed, as it is too long to be presented in-line. So wrap it in \[ ... \] which will set it as a centered block. To answer the other questions, more information is needed, particularly what document class you are using. For best results, show us a complete small code example, starting with \documentclass and ending with \end{document} that demonstrates the parts you want to adjust. Commented May 18, 2022 at 20:52

1 Answer 1

1

It should be, e.g.,

\newpage

\section*{Basics}
\begin{definition} [\textsc{Pochhammer}-Symbol]
        The \textsc{Pochhammer-Symbol} with $(a;q)_n$
         is an expression in combinatorics, which is defined as 
\[
    \begin{cases}
            (a;q)_n:=\prod_{k=0}^{n-1}(1-aq^k)  & \text{$k>0$} \\\\[2ex]
                        (a;q)_0=1  & \text{$k=0$}
        \end{cases}
\]
        The symbol also.....
\end{definition}

as cases is an environment used in math style. Additionally, I am assuming that you are using a package that defines cases.

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  • 1
    +1. I would change \text{$k>0$} and \text{$k=0$} tok>0 and k=0, though. One should also consider changing \\\\[2ex] to \\[1ex].
    – Mico
    Commented May 19, 2022 at 10:24
  • 1
    @Mico Certainly. \text is meaningless in this version, but I have assumed that in a better one it will be \text{ for $k=0$} or something similar. Commented May 19, 2022 at 16:21

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