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囧 能不能自己加个package?

Posted by cuiaoxiang at 2009-01-22 18:03:56
In Reply To:我也试试 Posted by:cuiaoxiang at 2009-01-22 18:01:43 
> \xymatrix{
> 0\ar[r]&X\ar[d]_x\ar[r]_f&Y\ar@{-->}[ld]^y\\
> &I}
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