## Tag `08X4`

Chapter 34: Descent > Section 34.4: Descent for universally injective morphisms > Lemma 34.4.18

\begin{equation} \tag{34.4.18.1} \xymatrix@C=8pc{ S_1 \ar[r]^{\delta^1_1} & S_2 \ar@<1ex>[r]^{\delta^2_2} \ar@<-1ex>[r]_{\delta^2_1} & S_3 } \end{equation}

The code snippet corresponding to this tag is a part of the file `descent.tex` and is located in lines 1164–1171 (see updates for more information).

```
\begin{equation}
\label{equation-equalizer-S}
\xymatrix@C=8pc{
S_1 \ar[r]^{\delta^1_1} &
S_2 \ar@<1ex>[r]^{\delta^2_2} \ar@<-1ex>[r]_{\delta^2_1} &
S_3
}
\end{equation}
```

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