On a question of Nori: Obstructions, improvements, and applications

Article Type

Research Article

Publication Title

Journal of Algebra

Abstract

This article concerns a question asked by M. V. Nori on homotopy of sections of projective modules defined on the polynomial algebra over a smooth affine domain R. While this question has an affirmative answer, it is known that the assertion does not hold if: (1) dim(R)=2; or (2) d≥3 but R is not smooth. We first prove that an affirmative answer can be given for dim(R)=2 when R is an F‾p-algebra. Next, for d≥3 we find the precise obstruction for the failure in the singular case. Further, we improve a result of Mandal (related to Nori's question) in the case when the ring A is an affine F‾p-algebra of dimension d. We apply this improvement to define the n-th Euler class group En(A), where 2n≥d+2. Moreover, if A is smooth, we associate to a unimodular row v of length n+1 its Euler class e(v)∈En(A) and show that the corresponding stably free module, say, P(v) has a unimodular element if and only if e(v) vanishes in En(A).

First Page

271

Last Page

299

DOI

https://10.1016/j.jalgebra.2023.08.003

Publication Date

12-1-2023

Comments

Open Access, Green

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