\xymatrix{
& I\ar[dl]_{\operatorname{id}_a}\ar[dr]^{\operatorname{id}_b} &\\
C(a,a)\ar[rr]^{T_{aa}} & & D(T(a),T(a))
}

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• 2006-04-30 00:03 (UTC) | Lethe | 3552 (bytes) | 280×85 | <pre> \xymatrix{ & I\ar[dl]_{\operatorname{id}_a}\ar[dr]^{\operatorname{id}_b} &\\ C(a,a)\ar[rr]^{T_{aa}} & & D(T(a),T(a)) } </pre>