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4.7
いろいろ
\[
\def\objectstyle{\scriptstyle}
\def\labelstyle{\scriptstyle}
Z
\cong
\lim\left(
\vcenter{
\hbox{
$
\underbrace{
\xymatrix@C=6pt{
&
&
X
\ar[lld]
\ar[ld]
\ar@{}[d]|(.6){\dots}
\ar[rd]
\ar[rrd]
&
&
\\
Y
&
Y
&
\dots\dots
&
Y
&
Y
}
}_n
$
}
}\right)
\]
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