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\nopagenumbers
\iftrue
% set up Cambria Math as math roman, symbol and extension families
\font\1="Cambria Math:script=math" at 10pt
\font\2="Cambria Math:script=math;+ssty=0" at 7pt
\font\3="Cambria Math:script=math;+ssty=1" at 5pt
\textfont0=\1 \scriptfont0=\2 \scriptscriptfont0=\3
\textfont2=\1 \scriptfont2=\2 \scriptscriptfont2=\3
\textfont3=\1 \scriptfont3=\2 \scriptscriptfont3=\3
\let\tenrm=\1 \rm
% use Cambria Math with italic mapping for family 1
\font\1="Cambria Math:script=math;mapping=math-italic" at 10pt
\font\2="Cambria Math:script=math;mapping=math-italic;+ssty=0" at 7pt
\font\3="Cambria Math:script=math;mapping=math-italic;+ssty=1" at 5pt
\textfont1=\1 \scriptfont1=\2 \scriptscriptfont1=\3
%% need additional font/family declarations with other mappings
%% for blackboard, calligraphic, fraktur, typewriter, etc
\XeTeXmathcode`\-="2 "2 "2212 % minus sign
\XeTeXmathcode`\/="0 "1 "2215 % division slash
\XeTeXmathcode`\.="0 "1 `. % period
\XeTeXmathcode`\,="0 "1 `, % comma
\XeTeXmathchardef\ldotp="6 "2 `.
\XeTeXmathchardef\cdotp="6 "2 `∙
\XeTeXmathchardef\sum="1 "2 `∑
\XeTeXmathchardef\prod="1 "2 `∏
\XeTeXmathchardef\intop="1 "2 `∫
\XeTeXmathchardef\ointop="1 "2 `∮
\XeTeXmathchardef\pi="7 "1 `π
\XeTeXmathchardef\phi="7 "1 `ϕ
\XeTeXmathchardef\nu="7 "1 `ν
\XeTeXmathchardef\geq="3 "2 `≥ \let\ge=\geq
\XeTeXmathchardef\leq="3 "2 `≤ \let\le=\leq
\XeTeXmathchardef\to="3 "2 `→
\XeTeXmathchardef\alpha="0 "1 `α
\XeTeXmathchardef\beta="0 "1 `β
\XeTeXmathchardef\gamma="0 "1 `γ
\XeTeXdelcode"2F="2 "2044 % \fracslash
\XeTeXdelcode"28="2 "28 % (
\XeTeXdelcode"29="2 "29 % )
\XeTeXdelcode"5B="2 "5B % [
\XeTeXdelcode"5D="2 "5D % ]
\def\lceil{\XeTeXdelimiter"4 "3 "2308 }
\def\rceil{\XeTeXdelimiter"5 "3 "2309 }
\def\lfloor{\XeTeXdelimiter"4 "3 "230A }
\def\rfloor{\XeTeXdelimiter"5 "3 "230B }
\def\{{\XeTeXdelimiter"4 "3 "7B }
\def\}{\XeTeXdelimiter"4 "3 "7D }
\def\sqrt{\XeTeXradical"3 "221A }
\fi
$$A^{B^C}_{D_E}$$
\centerline{$\int^{a=n}_0\left({a+b\over c}\right)^2$}
$$\int^{a=n}_{a=0}\left({a+b\over c}\right)^2
\kern2em\int\limits^{a=n}_{a=0}\left({a+b\over c}\right)^2$$
$$a_0+{1\over\displaystyle a_1+
{\strut 1\over\displaystyle a_2+
{\strut 1\over\displaystyle a_3+
{\strut 1\over a_4}}}}$$
$$
\hbox{$\left( \sum_{k=1}^n A_k \right)$}
\kern2em
\biggl( \sum_{k=1}^n A_k \biggr)
\kern2em
\left( \sum_{k=1}^n A_k \right)
$$
$$\pi(n)=\sum_{m=2}^n\left\lfloor\biggl(\sum_{k=1}^{m-1}\bigl
\lfloor(m/k)\big/\lceil m/k\rceil\bigr\rfloor\biggr)^{-1}\right\rfloor$$
$$A=\pmatrix{a_{11}&a_{12}&\ldots&a_{1n}\cr
a_{21}&a_{22}&\ldots&a_{2n}\cr
\vdots&\vdots&\ddots&\vdots\cr
a_{m1}&a_{m2}&\ldots&a_{mn}\cr}$$
$$\left\{
\eqalign{\alpha&=f(z)\cr \beta&=f(z^2)\cr \gamma&=f(z^3)\cr}
\right\}\qquad\left\{
\eqalign{x&=\alpha^2-\beta\cr y&=2\gamma\cr}\right\}$$
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