• The Projection Formula I. The diagram

    commutes, i.e. we have

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

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


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