Abstract
Projective geometry enters the study of partial differential equations of mixed elliptic–hyperbolic type by a very indirect route, beginning with the following geometric variational problem.
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Otway, T.H. (2012). Projective Geometry. In: The Dirichlet Problem for Elliptic-Hyperbolic Equations of Keldysh Type. Lecture Notes in Mathematics(), vol 2043. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-24415-5_6
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