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A Degree Map On Unimodular Rows
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Let k be a field and let (𝔸n−0) be the punctured affine space. We associate to any morphism g : (𝔸n −0)→ (𝔸n −0) an element in the Witt group W(k) that we call the degree of g.We then use this degree map to give a negative answer to a question of M. V. Nori about unimodular rows.
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