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The trace of the local $\mathbf{A}^1$-degree

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arxiv 1912.04788 v2 pith:3F76YWU7 submitted 2019-12-10 math.AT math.AG

classification math.ATmath.AG
keywords degreelocalmathbbfieldformkassresiduescheja-storch
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abstract

We prove that the local $\mathbb{A}^1$-degree of a polynomial function at an isolated zero with finite separable residue field is given by the trace of the local $\mathbb{A}^1$-degree over the residue field. This fact was originally suggested by Morel's work on motivic transfers and by Kass and Wickelgren's work on the Scheja-Storch bilinear form. As a corollary, we generalize a result of Kass and Wickelgren's relating the Scheja-Storch form and the local $\mathbb{A}^1$-degree.

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