76.2.1.1

\begin{equation} \label{spaces-flat-equation-impurity} \vcenter { \xymatrix{ \xi \ar@{|->}[d] & \\ t' \ar@{~>}[r] & t \ar@{|->}[r] \ar[r] & y } } \quad \quad \vcenter { \xymatrix{ X_ T \ar[d]_{f_ T} \ar[r] & X \ar[d]^ f \\ T \ar[r]^ g & Y } } \end{equation}

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