cubic diagram

Cubic diagram

\begin{displaymath}\begin{array}{c} \xymatrix @R=2pc@C=2pc@L=0pt{ A \ar[rr]^*+{f...
...(0.35)*+{\phi} & \\ & Y \ar[rr]_*+{\bar{g}} & & R } \end{array}\end{displaymath} (7.5.6)



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