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arXiv · 1908.05538

The fundamental group of binoid varieties

Holger Brenner·Ilia Pirashvili
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Abstract

Binoid schemes generalise monoid schemes, which in turn enable us to generalise toric varieties. Let $X$ be a binoid scheme. The aim of this paper is to calculate the topological fundamental group of $KX$, where $K=\mathbb{C}$ or $\mathbb{R}$. For the latter, we will give an explicit way of calculating the fundamental group using methods from 2-category theory. Indeed, we will calculate the more general fundamental groupoid. As a specialisation, we will also look at the Stanley Reisner Rings. Our method simplifies in this case, allowing us to describe the fundamental groupoid in terms of the simplicial complex directly.

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Holger Brenner, Ilia Pirashvili. 2019-08-15. The fundamental group of binoid varieties. https://arxiv.org/abs/1908.05538

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