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arXiv · 2104.15128

A Norm Functor for Quadratic Algebras

Owen Biesel
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Abstract

Given commutative, unital rings $A$ and $B$ with a ring homomorphism $A\to B$ making $B$ free of finite rank as an $A$-module, we can ask for a "trace" or "norm" homomorphism taking algebraic data over $B$ to algebraic data over $A$. In this paper we we construct a norm functor for the data of a quadratic algebra: given a locally-free rank-$2$ $B$-algebra $D$, we produce a locally-free rank-$2$ $A$-algebra $\mathrm{Nm}_{B/A}(D)$ in a way that is compatible with other norm functors and which extends a known construction for \'etale quadratic algebras. We also conjecture a relationship between discriminant algebras and this new norm functor.

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Owen Biesel. 2021-04-30. A Norm Functor for Quadratic Algebras. https://arxiv.org/abs/2104.15128

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