A generalization of Mumford's geometric invariant theory.
Hausen, Jürgen (2001)
Documenta Mathematica
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Hausen, Jürgen (2001)
Documenta Mathematica
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Reichstein, Zinovy, Vonessen, Nikolaus (2004)
Journal of Lie Theory
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Hanspeter Kraft (1994-1995)
Séminaire Bourbaki
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Dmitri I. Panyushev (1995)
Annales de l'institut Fourier
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We study -actions of the form , where is the dual (to ) -variety. These actions are called the doubled ones. A geometric interpretation of the complexity of the action is given. It is shown that the doubled actions have a number of nice properties, if is spherical or of complexity one.
A. Fauntleroy (1988)
Compositio Mathematica
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Jürgen Hausen (2003)
Annales de l’institut Fourier
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Let a reductive group act on an algebraic variety . We give a Hilbert-Mumford type criterion for the construction of open -invariant subsets admitting a good quotient by .
Amassa Fauntleroy (1985)
Compositio Mathematica
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