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4.4
包
含
射
の
一
例
\[
\xymatrix@=18pt{
S\times_XY
\ar[rr]
\ar@{}[d]|{\bigcap}
&
&
S
\ar@{}[d]|{\bigcap}
\\
Y
\ar[r]
&
R
\ar@{}[r]|*{\subset}
&
X.
}
\]
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