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(1987)Let s be the lowest degree of a surface containing a maximal rank curve Y. We want to compare the dimension of the space of the surfaces of degree s containing Y with the dimension of the space of the surfaces of degree ...
(1987)We rind the upper bound for the third Chem class of a curvilinear sheaf with seminatural cohomology, and we determine all the triples of Chem classes for which there exist two different kinds of seminatural cohomology. ...