The basic structure of a Beamer input file is pretty simple. Consider the file small.tex, the content of which is shown below:

% small.tex \documentclass{beamer} \usetheme{default} \begin{document} \begin{frame}{A sample slide} A displayed formula: \[ \int_{-\infty}^\infty e^{-x^2} \, dx = \sqrt{\pi} \] An itemized list: \begin{itemize} \item itemized item 1 \item itemized item 2 \item itemized item 3 \end{itemize} \begin{theorem} In a right triangle, the square of hypotenuse equals the sum of squares of two other sides. \end{theorem} \end{frame} \end{document}

The input file above produces the following slide:

**Remark:**
In Beamer, a *frame* is what you would normally call a
“slide”. The image shown above is the realization of a single “frame”.
In what follows, I use the terms “frame” and “slide” interchangeably.^{1}

The `\begin{frame}...\end{frame}`

block
may be repeated any number of times to produce a sequence of slides.

**Remark:**
In the example above we have:

\begin{frame}{A sample slide} ... \end{frame}

The *“A sample slide”* is the slide’s title. Its use is optional
but it is only in very rare cases where omitting it would make sense.

Beamer provides an alternative method for specifying a slide’s title. The following is exactly equivalent to the fragment shown above:

\begin{frame} \frametitle{A sample slide} ... \end{frame}

In earlier versions of Beamer, the latter was the only way to specify a slide’s title. I don’t recommend its use unless your Beamer is so old that the newer syntax is not available.

^{1} In Beamer, a “slide” and a “frame” are technical
terms with
distinct meanings. However it is of no profit to
the casual user to fret over the distinction.