Skipping multiple slides in beamer,back and forth

Question

I'm preparing a beamer presentation which includes lengthy formulas and would like to be able to skip back or forth when I want to refer to a formula already stated...how can I achieve this

Answer 1

First Approach

The first step is to set up a hyperlink that brings you to the stated formula. And then...

If you want just that two buttons, do the following

\documentclass{beamer}
    \hypersetup{colorlinks}
    \usepackage{tikz}

\defbeamertemplate*{navigation symbols}{just back and forward}
{%
  \hbox{%
    \begin{tikzpicture}%
        \path(0pt,0pt)(40pt,20pt);
        \fill[black!20](10pt,3pt)rectangle(35pt,17pt);
        \fill[black!10](10pt,10pt)circle(10pt);
        \draw[<-,line width=3](3pt,10pt)--(17pt,10pt);
        \draw[->,line width=2.5](22pt,10pt)--(33pt,10pt);
    \end{tikzpicture}\kern-40pt%
    \Acrobatmenu{GoBack}{\vbox to20pt{}\kern20pt}%
    \Acrobatmenu{GoForward}{\vbox to20pt{}\kern20pt}%
  }%
}

\begin{document}

\Huge

\makeatletter
\foreach\i in{1,...,8}{
    \frame{
        \foreach\j in{1,...,8}{
            \ifnum\i=\j
                This is page \i \par
            \else
                \hyperlink{page.\j}{Go to page \j} \par
            \fi
        }
    }
}

\end{document}

Second Approach (not yet working)

Potentially you can set up a hyperlink button that brings you to the current page but with different zoom.

This means that you can typeset a very tiny formula somewhere at the current page; and then use a button to zoom in. Usually your PDF viewer will provide a shortcut to let you zoom to fit; and that is how you go back.

Someone had done this before. But it a little too complex to be explained here. So I will leave the link here: Automatic "Zoom in" hypertext boxes in PDF