Andreev, B. A. Characteristic and hypocharacteristic directions of a mapping f. (Russian) Zbl 0523.53022 Differ. Geom. Mnogoobrazij Figur 14, 9-11 (1983). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page MSC: 53A20 Projective differential geometry Keywords:characteristic direction; projective space; pairs of points and hyperquadrics PDFBibTeX XMLCite \textit{B. A. Andreev}, Differ. Geom. Mnogoobr. Figur 14, 9--11 (1983; Zbl 0523.53022)