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 :

\setbeamertemplate{navigation symbols}{}
\title{A study}
\author{Hiren Garai}
\begin{block}{\begin{center} \huge \textbf{A study}
\textcolor{blue}{Hiren Garai} \\
\textcolor{black}{\small{Department of Mathematics
\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: 
\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. $ 
is called a $2$-metric, on $X.$ The set $X$ equipped with such a 2-metric is called a \textit{$2$-metric space.}

Thank you.

  • 2
    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.

Some other comments:

  • 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




$\{ 0 \}$ 

  • 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
  • 1
    @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

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