Mathematics – Algebraic Geometry
Scientific paper
2012-04-20
Mathematics
Algebraic Geometry
25 pages; Comments welcome!
Scientific paper
We complete the determination of the first non-stable A^1-homotopy sheaf of SL_n by treating the case where n is even. Using techniques of obstruction theory involving the A^1-Postnikov tower, supported by some ideas from the theory of unimodular rows, we classify vector bundles of rank \geq [d/2] on split smooth affine quadrics of dimension d. These computations allow us to answer a question posed by Nori, which gives a criterion for completability of certain unimodular rows. Furthermore, we study compatibility of our computations of A^1-homotopy sheaves with real and complex realization.
Asok Aravind
Fasel Jean
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