• The Projection Formula II. We have a natural transformation

    with components

    \[ f_{!}\webleft (U\webright )\cap V\subset f_{!}\webleft (U\cap f^{-1}\webleft (V\webright )\webright ) \]

    indexed by $U\in \mathcal{P}\webleft (X\webright )$ and $V\in \mathcal{P}\webleft (Y\webright )$.


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