Robuta

https://math.ucsd.edu/seminar/fixed-point-property-and-piecewise-projective-transformations-line The fixed-point property and piecewise-projective transformations of the line | Department of... the fixed point projective transformations property piecewise line https://www.impan.pl/en/publishing-house/journals-and-series/colloquium-mathematicum/all/15/1/96237/some-remarks-on-infinitesimal-projective-transformations-in-recurrent-and-ricci-recurrent-spaces Some remarks on infinitesimal projective transformations in recurrent and Ricci-recurrent spacesAll some remarks projective transformations infinitesimal recurrent ricci