# The number '0' missing everywhere in my latex slide

Title suggests the problem. I am preparing a slide of my project to present but after compiling I found that all the 0's are missing ghostly. Any solution will be highly appreciated.

my code is :

\documentclass[teal]{beamer}
\usepackage{color}
\usepackage{amssymb}
\usepackage{amsmath,amssymb,amsthm}
\usepackage{amsfonts}
\usepackage{mathptmx}
\usepackage{amssymb}
\usepackage[mathscr]{euscript}
\usepackage{mathrsfs}
\usepackage{amsthm}\input{amssym.def}
%\usetheme{Montpellier}%
\usetheme{PaloAlto}
\setbeamercolor{frametitle}{fg=black,bg=cyan!60}
%\setbeamercolor{title}{fg=blue,bg=yellow}
\definecolor{exam}{rgb}{0.0,0.30,0.0}
\definecolor{rem}{rgb}{0.50,0.00,0.50}
\definecolor{thm}{rgb}{0.40,0.00,0.00}
\definecolor{primary}{rgb}{0.60,0.70,0.89}
\newcommand{\lcb}{\overline{\mathcal{L}}}
\newcommand{\rb}{\overline{\mathcal{R}}}
\newcommand{\hb}{\overline{\mathcal{H}}}
\newcommand{\jcb}{\overline{\mathcal{J}}}
\newcommand{\db}{\overline{\mathcal{D}}}
\newcommand{\lc}{\mathcal{L}}
\newcommand{\rc}{\mathcal{R}}
\newcommand{\hc}{\mathcal{H}}
\newcommand{\jc}{\mathcal{J}}
\newcommand{\dc}{\mathcal{D}}
\newcommand{\ec}{\mathcal{\eta}}
\newcommand{\lp}{\mathcal{L}^+}
\newcommand{\rp}{\mathcal{R}^+}
\newcommand{\hp}{\mathcal{H}^+}
\newcommand{\dpp}{\mathcal{D}^+}
\newcommand{\jp}{\mathcal{J}^+}
\newcommand{\ld}{\mathcal{L}^{\bullet}}
\newcommand{\rd}{\mathcal{R}^{\bullet}}
\newcommand{\hd}{\mathcal{H}^{\bullet}}
\newcommand{\dd}{\mathcal{D}^{\bullet}}
\newcommand{\jd}{\mathcal{J}^{\bullet}}
\newcommand{\red}{\mathbf{R}e^{\bullet}}
\newcommand{\lzd}{\mathbf{LZ}^{\bullet}}
\newcommand{\rzd}{\mathbf{RZ}^{\bullet}}
\newcommand{\lzp}{\mathbf{LZ}^{+}}
\newcommand{\rzp}{\mathbf{RZ}^{+}}
\newcommand{\slp}{\mathbf{SL}^{+}}
\newcommand{\vb}{\mathbf{B}}
\newcommand{\vd}{\mathbf{D}}
\newcommand{\vi}{\mathbf{I}}
\newcommand{\vn}{\mathbf{N}}
\newcommand{\vln}{\mathbf{LN}}
\newcommand{\vrn}{\mathbf{RN}}
\newcommand{\vlp}{\mathbf{L}^{+}}
\newcommand{\vrp}{\mathbf{R}^{+}}
\newcommand{\bi}{\mathbf{BI}}
\newcommand{\lbi}{\mathbf{LBI}}
\newcommand{\rbi}{\mathbf{RBI}}
\beamersetuncovermixins{\opaqueness<1>{25}}{\opaqueness<2->{15}}
\begin{document}
\title{A study}
\author{Hiren Garai}
\date{}
\begin{frame}
\begin{block}{\begin{center} \huge \textbf{A study}
\end{center}}
\end{block}
\begin{center}
\textcolor{blue}{Hiren Garai} \\
\textcolor{black}{\small{Department of Mathematics
}}
\end{center}
\end{frame}
\section{Introduction}
\begin{frame} \frametitle{Introduction}
Functional Analysis is mainly concerned with the structure of infinite dimensional vector spaces and transformations, which are frequently called operators between such spaces.
In the sixities, 2-metric spaces were introduced by G\"ahler \cite{Ga 1}, \cite{Ga 2}.
\begin{Definition} Let $X$ be a nonempty set, and let $R$ be the set of all reals and ${R^+}$ be the set of positive reals. A function $d : X \times X \times X \implies {R^+} \cup \{{0}\}$ satisfying:
\begin{itemize}
\item[(D1)] \; For distinct points $x, y,\in X$, there is $z \in X$, such that $d(x,y,z) \neq 0.$
\item[(D2)] \; $d(x,y,z) = 0$ if two of the triple $x,y,z \in X$ are equal.
\item[(D3)] \; $d(x,y,z) = d(x,z,y) = \cdots$ (symmetry in all three variables).
\item[(D4)] \; $d(x,y,z) \leq d(x,y,a) + d(x,a,z) + d(a,y,z), \, \forall x,y,z,a \in X.$
\end{itemize}
is called a $2$-metric, on $X.$ The set $X$ equipped with such a 2-metric is called a \textit{$2$-metric space.}
\end{Definition}
\end{Document}


Thank you.

• amssym.def is a file for plain TeX or AMS-TeX, nothing a LaTeX user should consider. – egreg May 16 '18 at 16:20

Remove \input{amssym.def} to get your 0 back.

• you don't need \usepackage{color} with beamer

• \end{frame} is missing

• it should be \end{document} not \end{Document}

• use \author etc before \begin{document} to include it in the pdf meta data

\documentclass{beamer}

%\input{amssym.def}

\begin{document}
\begin{frame}

$\{ 0 \}$

\end{frame}
\end{document}

• Thank you for your answer and other suggestions. But for my curiosity, I want to know why this happened ? Actually the same code gave 0 in my friend's project (although his topic is different, but the beginning of the code is totally same ) but it doesn't produce 0 in mine ... – hiren_garai May 16 '18 at 16:15
• @HirenGarai The problematic part from amssym.def is \def\hexnumber@#1{\ifcase#1 0\or 1\or 2\or 3\or 4\or 5\or 6\or 7\or 8\or 9\or A\or B\or C\or D\or E\or F\fi}. It is hard to say why it worked for your friend, maybe some differences in the code? Another engine? Another version? – user36296 May 16 '18 at 16:23