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Weakly proper toric quotients

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A'Campo-Neuen A.

Colloquium Mathematicum

2005

tom 102

nr 2

155-180

We consider subtorus actions on complex toric varieties. A natural candidate for a categorical quotient of such an action is the so-called toric quotient, a universal object constructed in the toric category. We prove that if the toric quotient is weakly proper and if in addition the quotient variety is of expected dimension then the toric quotient is a categorical quotient in the category of algebraic varieties. For example, weak properness always holds for the toric quotient of a subtorus action on a toric variety whose fan has a convex support.

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1 Colloquium Mathematicum

1 A'Campo-Neuen A.

1 2005

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Weakly proper toric quotients