We know that is a map from a real projective space to itself, which sends real projective lines to real projective lines, is a real projective transformation. I am interested to know if there is a local version of this result. That is, given a local diffeomorphism of a real projective space, which sends projective lines to real projective lines, is it a real projective transformation of the space restricted to an open set?
2026-03-25 21:53:28.1774475608
Local projective transformations
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