
\parindent=0pt
\parskip=10pt


% -- define a macro of our own:
\def\ttbackslash{{\tt \char'134}}


{\bf A Simple Example}

Hello from \TeX!  This is a short example of a (plain-)\TeX\ source file.
It containts a few {\it macros}, the words which start with a backslash, 
`\ttbackslash'.  The first two macros, for example, 
\ttbackslash{\tt parindent} and \ttbackslash{\tt parskip}, set the size
of the indent at the start of a paragraph and the vertical spacing between
paragraphs, respectively.  I am sure you can guess what some of the other
macros do!  

This is a the start of a new paragraph;  a new paragraph is begun by leaving
a blank line in the source file.  
Since \TeX\ is good at type-setting mathematics, here is an 
equation, $y = mx + c$, and another:
$$ {{{\rm d}y} \over {{\rm d}x}} = \int^{\infty}_{0} \! f(x)\,{\rm d}x.
   \eqno{(1)} $$
Notice that the `d's are not italicised --- many publications get this wrong,
particularly american publications --- and the fine control over the spacing:
a small horizontal skip has been added before the `${\rm d}x$' on the right, 
as is traditional;  in addition I have decided to reduce the default 
horizontal spacing inserted by \TeX\ after the integral sign, by using the
`\ttbackslash{\tt !}' macro.

\bye
