# the command \par does not work?

I have this code:

\documentclass[8pt,a4paper]{article}
\newcounter{conto}
\setcounter{conto}{\time}
\usepackage{lmodern}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{amssymb}
\usepackage{ dsfont }
\begin{document}
\section{Prove 1}
\begin{flushleft}
Def.: let be $$\mathfrak{m}: x \to \mathcal{P}( \mathcal{P}(x))$$, $$\mathfrak{m}$$ is topology on $$x$$ if \par
1) $$x \neq \emptyset$$ \par
2) $$\forall a \in x (x \in \mathfrak{m}(a) )$$ \par
3) $$\forall a \in x (\forall t \in \mathfrak{m}(a)( a \in t))$$ \par
4) $$\forall a \in x(\forall r,s \in \mathfrak{m}(a)((r \cap s) \in \mathfrak{m}(a) ))$$ \par
5) $$\forall a \in x( \forall t \in \mathfrak{m}(x)(\exists r \in \mathfrak{m}(x)(\forall y \in r(t \in \mathfrak{m}(y)))))$$ \par
6) $$\forall a \in x(\forall t \in \mathfrak{m}(x)(\forall r \subseteq x(t \subseteq r \to r \in \mathfrak{m}(x))))$$
\section{Prove 2}
\end{flushleft}
\end{document}


the pdf is following:

Because the command \par doesn't work?

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Why don't use enumerate? –  In PSTricks we trust Nov 2 '13 at 19:13
@Marienplatz, how to do ? –  mle Nov 2 '13 at 19:14
\begin{enumerate} \item \end{enumerate} –  Sigur Nov 2 '13 at 19:17
\par is working, it's just that flushleft sets the paragraph indentation to 0pt. (However in this case, as has already been mentioned, you want the enumerate environment.) –  Nicola Talbot Nov 2 '13 at 19:39

\documentclass[preview,border=12pt]{standalone}% change it back to your own documentclass

\usepackage{enumerate}

\usepackage{amssymb}

\begin{document}
\section{Prove 1}

Def.: let be $$\mathfrak{m}: x \to \mathcal{P}( \mathcal{P}(x))$$, $$\mathfrak{m}$$ is topology on $$x$$ if
\begin{enumerate}[1)]
\item $$x \neq \emptyset$$
\item $$\forall a \in x (x \in \mathfrak{m}(a) )$$
\item $$\forall a \in x (\forall t \in \mathfrak{m}(a)( a \in t))$$
\item $$\forall a \in x(\forall r,s \in \mathfrak{m}(a)((r \cap s) \in \mathfrak{m}(a) ))$$
\item $$\forall a \in x( \forall t \in \mathfrak{m}(x)(\exists r \in \mathfrak{m}(x)(\forall y \in r(t \in \mathfrak{m}(y)))))$$
\item $$\forall a \in x(\forall t \in \mathfrak{m}(x)(\forall r \subseteq x(t \subseteq r \to r \in \mathfrak{m}(x))))$$
\end{enumerate}
\end{document}


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I did not consider whether or not your math expressions should get more correction (such as replacing the nested braces with something like \left(...\right)) as I am not competent in your field. –  In PSTricks we trust Nov 2 '13 at 19:22
IMO no braces are needed at all. –  marczellm Nov 2 '13 at 20:53