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Chow quotients of $\mathbb{C}^*$-actions

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Given an action of the one-dimensional torus on a projective variety, the associated Chow quotient arises as a natural parameter space of invariant $1$-cycles, which dominates the GIT quotients of the variety. In this paper we explore the relation between the Chow and the GIT quotients of a variety, showing how to construct explicitly the former upon the latter via successive blowups under suitable assumptions. We also discuss conditions for the smoothness of the Chow quotient, and present some examples in which it is singular.

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Mixed Eulerian numbers and beyond

math.AG · 2025-02-07 · accept · novelty 8.0

First explicit formula for mixed Eulerian numbers, and proof that matroidal mixed Eulerian numbers determine Derksen's G-invariant.

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  • Mixed Eulerian numbers and beyond math.AG · 2025-02-07 · accept · none · ref 42 · internal anchor

    First explicit formula for mixed Eulerian numbers, and proof that matroidal mixed Eulerian numbers determine Derksen's G-invariant.