On integral images of Curtis homomorphisms for $\mathrm{GL}_n$ and $\mathrm{U}_n$

Tzu-Jan Li

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arXiv · 2401.04989

On integral images of Curtis homomorphisms for $\mathrm{GL}_n$ and $\mathrm{U}_n$

Tzu-Jan Li

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Abstract

For $G = \mathrm{GL}_n$ or $\mathrm{U}_n$ defined over a finite field of characteristic $p$, we refine a result of Bonnaf\'e and Kessar on the saturatedness of the Curtis homomorphism $\mathrm{Cur}^G$ by describing the image of $\mathrm{Cur}^G$ over $\overline{\mathbb{Z}}[1/p]$ via a system of linear conditions.

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BibTeX RIS

Tzu-Jan Li. 2024-01-10. On integral images of Curtis homomorphisms for $\mathrm{GL}_n$ and $\mathrm{U}_n$. https://arxiv.org/abs/2401.04989

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