\magnification=\magstep0	% to get small
%\magnification=\magstephalf	% to get buffer
%\magnification=\magstep1	% standard
%\magnification=\magstep2	% in between
%\magnification=\magstep3	% for view-graphs
%\magnification=\magstep4	% for posters
%\magnification=\magstep5	% for ?
%\hsize = 9.5 true in
%\vsize = 6.5 true in
\nopagenumbers

\centerline{%
ϵִĵ}
\centerline{%
Ƽл  (һ)}


ŵԵĴռӦã һʹǽޱȵԵñ
㡣ԭȻģ̫̫
  ΪֻжʮĸӢƵĵӲʮֲݡ


ӵִͿƼŰĽǶ˵  Ҳ첻ԶԶڍ
Ӣĺƴ֡ Usernet  comp.text ָ˵Ҫձˍ
ѧִȻֻ֪иĵ TeX Ŀǰܻӭִ
 ƴ֡


ڣ  Ƴĵ  Scribe,
TeX  PostScript ӡ
һʹⷽ治֣ʹĿƍ
༭ͼͨѶ


(δ)


ƥȱѧ


    (е̲ʿ)


\centerline{{\bf Ch\TeX, a system for technical typesetting}}

Here are a few examples:
% p. 145
$$\sqrt{1+\sqrt{1+\sqrt{1+
                \sqrt{1+\sqrt{1+\sqrt{1+\sqrt{1+x}}}}}}}$$
% p. 177
$$A=\pmatrix{a_{11}&a_{12}&\ldots&a_{1n}\cr
             a_{21}&a_{22}&\ldots&a_{2n}\cr
             \vdots&\vdots&\ddots&\vdots\cr
             a_{m1}&a_{m2}&\ldots&a_{mn}\cr}$$
% Ex. 17.10
$$\biggl({\partial^2\over\partial x^2}+
{\partial^2\over\partial y^2}\biggr)\bigl|\varphi(x+iy)\bigr|^2=0$$
% Ex. 18.37
$$\prod_{j\ge0}\biggl(\sum_{k\ge0}a_{jk}z^k\biggr)
   =\sum_{n\ge0}z^n\,\Biggl(\sum_
     {\scriptstyle k_0,k_1,\ldots\ge0\atop
      \scriptstyle k_0+k_1+\cdots=n}
   a_{0k_0}a_{1k_1}\ldots\,\Biggr)$$
% Ex. 18.45
$$2\uparrow\uparrow k\mathrel{\mathop=^{\rm def}}
  2^{2^{2^{\cdot^{\cdot^{\cdot^2}}}}}
   \vbox{\hbox{$\Big\}\scriptstyle k$}\kern0pt}$$
% Ex. 19.13
$$\eqalignno{\biggl(\int_{-\infty}^\infty e^{-x^2}\,dx\biggr)^2
 &=\int_{-\infty}^\infty\int_{-\infty}^\infty
   e^{-(x^2+y^2)}\,dx\,dy\cr
 &=\int_0^{2\pi}\int_0^\infty e^{-r^2}r\,dr\,d\theta\cr
 &=\int_0^{2\pi}\biggl(-{e^{-r^2}\over2}
   \bigg|_{r=0}^{r=\infty}\,\biggr)\,d\theta\cr
 &=\pi\cr}$$
% Ex. 18.30
$$\textstyle\sin18^\circ={1\over4}(\sqrt5-1)$$
% Ex. 18.31
$$k=1.38\times10^{-23}\rm\,J/^\circ K.$$

\bye
