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Line 17: * If ''f'' is proper, then ''f''<sub>!</sub> equals ''f''<sub>∗</sub>. * If ''f'' is an open [[embedding]], then ''f''<sub>!</sub> identifies with the extension by zero functor.<ref>{{Cite web \|title=general topology - Proper direct image and extension by zero \|url=https://math.stackexchange.com/~~questions~~q/2768645~~/proper-direct-image-and-extension-by-zero~~ \|access-date=2022-09-25 \|website=Mathematics Stack Exchange \|language=en}}</ref> ==References==

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