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Characterization of Stanley-Reisner varieties by their automorphism group

Díaz, Roberto et al.
arXiv (OAI Expanded) · Papers
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14m25algebraic-geometrycommutative-algebra
We study the automorphism ind-group of a Stanley-Reisner variety $X_Δ$ through a combinatorial toolkit on the underlying complex: a facet closure operator, its Demazure roots, and the resulting dichotomy between exposed and hidden facets. Our main theorem is that a fully exposed complex, that is, on
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