Download Cohomology of Vector Bundles & Syzygies by Jerzy Weyman PDF

By Jerzy Weyman

The important topic of this e-book is an in depth exposition of the geometric means of calculating syzygies. whereas this is often an immense device in algebraic geometry, Jerzy Weyman has elected to jot down from the viewpoint of commutative algebra which will steer clear of being tied to big instances from geometry. No past wisdom of illustration conception is thought. Chapters on a number of functions are incorporated, and diverse routines will supply the reader perception into how one can follow this significant procedure.

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Extra resources for Cohomology of Vector Bundles & Syzygies

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Vm+1 → Vm over a field K. For a vector space of dimension n we define its determinant to be the one dimensional vector space det(V ) := n V . Similarly we define the inverse of the determinant of V by setting det(V )−1 := n (V ∗ ). We define the determinant of a complex V• to be a one dimensional vector space n i det(V• ) = det(Vi )(−1) . 1) Proposition. Let 0→V →V →V →0 be an exact sequence of complexes. Then we have a canonical isomorphism det(V ) ⊗ det(V ) → det(V ). Proof. Let {u 1 , . . , u m } be a basis of V .

Sλt E, because they come with different signs and the product yb yc is symmetric. This means φλ U = 0. 7) Example. Let us take λ = (3, 3), u = v = 1. Consider U = x ⊗ y1 ∧ y2 ∧ y3 ∧ y4 ⊗ z. Then if T = x y1 ⊗ y3 y4 ⊗ y2 z then T = x y1 ⊗ y4 y3 ⊗ y2 z. Now T occurs as a summand in φλ (x ∧ y3 ∧ y2 ⊗ y1 ∧ y4 ∧ z), and T occurs as a summand in φλ (x ∧ y4 ∧ y2 ⊗ y1 ∧ y3 ∧ z). One checks easily that T and T cancel out. 6) means that φλ induces a surjective map from L λ E to Im φλ . Next we will show that the map φλ maps standard tableaux to linearly independent elements of Sλ1 E ⊗ Sλ2 E ⊗ .

5) Corollary. , all modules Hi (F• ) are supported in codimension 2. Then the determinant of F• is the greatest common divisor of the maximal minors of the map d1 . Proof. 3. Determinants of Complexes 31 H0 (F• ). This means after localizing at ( f ) the complex will be acyclic. This again reduces the statement to the case of complexes of length 1 resolving a torsion module, in which case we can check it directly. 6) Remark. The last statement is closely related to the so-called first structure theorem of Buchsbaum and Eisenbud [BE3].

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