Geodesic
Picard and Lefschetz numbers of real algebraic surfaces
Matematičeskie zametki, Tome 63 (1998) no. 6, pp. 847-852 
V. A. Krasnov. Picard and Lefschetz numbers of real algebraic surfaces. Matematičeskie zametki, Tome 63 (1998) no. 6, pp. 847-852. http://geodesic.mathdoc.fr/item/MZM_1998_63_6_a4/
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     author = {V. A. Krasnov},
     title = {Picard and {Lefschetz} numbers of real algebraic surfaces},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1998_63_6_a4/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Two Picard numbers and two Lefschetz numbers are defined for a real algebraic surface. They are similar to the Picard number and the Lefschetz number of a complex algebraic surface. For these numbers, some estimates and relations in the form of inequalities are proved.

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