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{\bf How does \TeX\ differ from other document compilers}
\medskip
\TeX\ provides for automatic ligature replacements, kerning, hyphenation,
line justification, centering, flushing right or left, tabular aligning,
the formatting of complicated mathematical expressions, automatic section and page
numbering, page breaking, the introduction of running heads, the numbering
and placing of footnotes, and the automatic preparation of a table of contents and an
index, to name but a few of its special features.
As many as 256 different fonts with up to 256 characters per font may be
used for a single document.
\TeX's real forte is mathematics:
$$
\sum_{i=1}↑{\infty}{1\over2↑i}=1,\quad
\{\underbrace{\overbrace{\mathstrut a,\ldots,a}
      ↑{k\;a\mathchar`'\rm s},
    \overbrace{\mathstrut b,\ldots,b}
      ↑{l\;b\mathchar`'\rm s}}_{k+l\rm\;elements}\},\quad
\sqrt{1+\sqrt{1+\sqrt{1+x}}},\quad
A=\pmatrix{
a_{11}&\ldots&a_{1n}\cr
\vdots&\ddots&\vdots\cr
a_{m1}&\ldots&a_{mn}\cr},
$$
$$
\biggl(\int_{-\infty}↑\infty e↑{-x↑2}\,dx\biggr)↑2=\pi,\quad
 2\uparrow\uparrow k\mathrel{\mathop=↑{\rm def}}
  2↑{2↑{2↑{\cdot↑{\cdot↑{\cdot↑2}}}}}
    \vbox{\hbox{$\Big\}\scriptstyle k$}\kern0pt},\quad
{f(x+\Delta x)-f(x)\over\Delta x}\to f'(x)\;\;\hbox{as $\;\Delta x\to0$}.
$$

\bye