106.5.21.1

\begin{equation} \label{stacks-geometry-equation-dim-inequality} \dim _{u'} (U') = \dim _{u'} (U'_{f(u')}) + \dim _{f'(u')}(\mathcal{T}) \\ \geq \dim _ u (U_{f(u)}) + \dim _{f(u)}(\mathcal{X}) = \dim _ u (U). \end{equation}

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