
Journal for Geometry and Graphics 22 (2018), No. 2, 195205 Copyright Heldermann Verlag 2018 A Proof of Pohlke's Theorem with an Analytic Determination of the Reference Trihedron Renato Manfrin Dipartimento di Culture del Progetto, Università IUAV, Dorsoduro 2196, 30123 Venezia, Italy manfrin@iuav.it By elementary arguments of linear algebra and vector algebra we give here a proof of Pohlke's fundamental theorem on oblique axonometry. We also present explicit formulae for the reference trihedrons (Pohlke matrices) and the corresponding directions of projection. Keywords: Pohlke's theorem, oblique axonometry. MSC: 51N10; 51N05 [ Fulltextpdf (285 KB)] 