Download e-book for iPad: Algèbres et Modules by Ibrahim Assem

By Ibrahim Assem

ISBN-10: 2225831483

ISBN-13: 9782225831485

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Ir is the determinant of the matrix formed by the columns of A := (aij ) with indices i1 , . . , ir . ir are Pl¨ ukker coordinates of some rdimensional subspace L ⊂ V if and only if they are not simultaneously zero and if for all i1 , . . , ir+1 , j1 , . . jr−1 = 0. jr−1 = asik Ns , s=1 where Ns does not depend on k. 5) k=1 for all s. Add the sth row to A to obtain an (r + 1) × n matrix As . 5) is, up to a sign, the expansion of the determinant of the matrix formed by the columns of As with indices i1 , .

The following projective version of the Nullsellensatz follows easily from the classical one. 3 (Projective Nullstellensatz) The maps I and Z induce an order-reversing bijection between algebraic sets in Pn and non-superfluous homogeneous radical ideals in k[S0 , . . , Sn ]. Under this correspondence, irreducible algebraic sets correspond to the prime ideals. Let Ui ⊂ Pn be the subset consisting of all points with non-zero ith homogeneous coordinate. This is the principal open set corresponding to the function Si .

An equivalent condition is as follows: for any prevariety Y and any two morphisms ϕ, ψ : Y → X the set {y ∈ Y | ϕ(y) = ψ(y)} is closed in Y . Indeed, applying this condition to π1 , π2 : X × X → X we conclude that ∆ is closed; conversely, the preimage of ∆ under ϕ×ψ : Y → X ×X is {y ∈ Y | ϕ(y) = ψ(y)}. It follows from the previous paragraph that a subprevariety of a variety is variety. We will refer to it a subvariety from now on. 1 is equivalent to the Hausdorff axiom. So we can think of varieties as prevarieties with some sort of an unusual Hausdorff axiom.

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Algèbres et Modules by Ibrahim Assem

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