Algebraic curves can be investigated by following several different ap- proaches (analytic, algebro-geometric, topological, mathematical physics):
Testo completo
K h0
More generally, a family f : C → S is said to be a family of curves in P r
The local properties of Hilb r p(X) (which for brevity sake will be denoted by Hilb whenever r and p(X) are inessential) at a closed point z correspond to properties of the scheme X(z) ⊆ P r parametrized by z. The Zariski tangent space to Hilb at z is canonically isomorphic to H 0 (X(z), N ), where N is the normal sheaf to X(z) in P r , defined as N = Hom(I/I 2 , O X(z) ), where I ⊆ O Pr
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