The n-Rays
نویسندگان
چکیده
منابع مشابه
CONTRACTIBLE EXTREMAL RAYS ON M0,n
One of the richest objects of study in higher dimensional algebraic geometry is the Mori-Kleiman (closed) cone of curves, N E 1 (M), defined as the closed convex cone in H 2 (M, R) generated by classes of irreducible curves on M. A lot of geometric information about M is encoded in the cone of curves. For example the possibilities for maps with connected fibres are determined by the cone's face...
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ژورنال
عنوان ژورنال: Nature
سال: 1904
ISSN: 0028-0836,1476-4687
DOI: 10.1038/069437c0