Get Arithmetic and geometry: papers dedicated to I.R. PDF

By Michael Artin, John Tate

ISBN-10: 3764331321

ISBN-13: 9783764331320

V. 1. mathematics -- v. 2. Geometry

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Additional resources for Arithmetic and geometry: papers dedicated to I.R. Shafarevich on the occasion of his sixtieth birthday

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16) μ1 (B1 , B2 , i, j) = 2 ¨ 3. 1, we introduce a map μC given by μC (B1 , B2 , i, j) = [B1 , B2 ] + ij. 17) This is a holomorphic map from M to gl(V ). ) Then μC −1 (0) is a GL(V )-invariant set. 12, we have −1 −1 ∼ −1 μ−1 C (0)// GL(V ) = {closed GL(V )-orbits in μC (0)} = μ1 (0) ∩ μC (0)/ U(V ). 10, we have seen that the left hand side is identified with the symmetric product S n (C2 ). In fact, we have a stronger result, that is there is n 2 an isomorphism between the coordinate rings of μ−1 C (0)// GL(V ) and S (C ) as −1 −1 follows.

Chapter 5). 8) def. px (g) = gx 2 for g ∈ GC . This function plays a fundamental role in the relationship between the moment map and geometric invariant theory as seen in the following proposition. 9. The map px has following properties. C (1) px descends to a function on G\GC /GC x , where Gx denotes the stabilizer of x. (2) (3) (4) (5) (6) px is convex as a function on the non-compact type symmetric space G\GC . g is a critical point if and only if μ(gx) = 0. All critical points are minima of px .

Hence there exists φ = 0 ∈ ker t τz . If we take S = ker φ V , then we have Bα (S) ⊂ S and im i ⊂ S. 2. Rank 1 case As remarked before, we can identify the framed moduli space M(1, n) of rank [n] 1 torsion free sheaves with (C2 ) . 9. 1. 8. Assume r = 1. 1 is given. Then (1) j = 0. 9. We need the following elementary lemma. 9. 1, but not necessarily (ii). Let S ⊂ Cn be a subspace defined by S= = Bα1 Bα2 · · · Bαk i(C) (products of B1 ’s and B2 ’s)i(C). Then the restriction j|S of j to S vanishes.

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Arithmetic and geometry: papers dedicated to I.R. Shafarevich on the occasion of his sixtieth birthday by Michael Artin, John Tate


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