Geodesic
Rational Surfaces with Exceptional Unodes
Canadian journal of mathematics, Tome 19 (1967) no. 1, pp. 938-951

Voir la notice de l'article provenant de la source Cambridge University Press

Many years ago, I defined (8) three types of exceptional unode on an algebraic surface, which I called U*8, U*9, U*10, corresponding, on a non-singular model of the surface, to sets of six, seven, and eight rational curves, each of grade — 2, with the intersection patterns represented by the Coxeter-Dynkin graphs now usually known as E6, E7, E8: where each dot represents a curve, and linked dots intersecting curves. In each case we shall denote the curves in the horizontal sequence by S1, s2, ... from left to right, and the extra curve meeting s3 by s*. 
Val, Patrick du. Rational Surfaces with Exceptional Unodes. Canadian journal of mathematics, Tome 19 (1967) no. 1, pp. 938-951. doi: 10.4153/CJM-1967-086-8
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