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arXiv · 1910.03029

The Tambara Structure of the Trace Ideal for Cyclic Extensions

Maxine Calle·Sam Ginnett·Harry Chen·Xinling Chen
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Abstract

This paper explores the Tambara functor structure of the trace ideal of a Galois extension. In the case of a (pro-)cyclic extension, we are able to explicitly determine the generators of the ideal. Furthermore, we show that the absolute trace ideal of a cyclic group is strongly principal when viewed as an ideal of the Burnside Tambara Functor. Applying our results, we calculate the trace ideal for extensions of finite fields. The appendix determines a formula for the norm of a quadratic form over an arbitrary finite extension of a finite field.

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Maxine Calle, Sam Ginnett, Harry Chen, Xinling Chen. 2020-05-28. The Tambara Structure of the Trace Ideal for Cyclic Extensions. https://doi.org/10.1016/j.jalgebra.2020.04.036

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