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arxiv: 1602.04644 · v2 · pith:SRWEHRXBnew · submitted 2016-02-15 · 🧮 math.AG

The pseudo-fundamental group-scheme

classification 🧮 math.AG
keywords alephschemedominatingexistencegrouppointedpro-algebraicpro-finite
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Let $X$ be any scheme defined over a Dedekind scheme $S$ with a given section $x\in X(S)$. We prove the existence of a pro-finite $S$-group scheme $\aleph(X,x)$ and a universal $\aleph(X,x)$-torsor dominating all the pro-finite pointed torsors over $X$. Though $\aleph(X,x)$ may not be unique in general it still can provide useful information in order to better understand $X$. In a similar way we prove the existence of a pro-algebraic $S$-group scheme $\aleph^{\rm alg}(X,x)$ and a $\aleph^{\rm alg}(X,x)$-torsor dominating all the pro-algebraic and affine pointed torsors over $X$. The case where $X\to S$ has no sections is also considered.

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