In algebraic geometry, the normal degree of a rational curve C on a surface is defined to be –K.C–2 where K is the canonical divisor of the surface.
References
Sommese, Andrew J.; Beltrametti, Mauro C. (1995), The adjunction theory of complex projective varieties, de Gruyter Expositions in Mathematics, 16, Berlin: Walter de Gruyter & Co., ISBN 978-3-11-014355-3, MR 1318687
Undergraduate Texts in Mathematics
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Hellenica World - Scientific Library
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