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An algebraic geometric model of an action of the face monoid associated to a Kac-Moody group on its building
Representation Theory · Submitted 27 Jun 2009
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Now we give an algebraic geometric model of one of these actions of the face monoid.
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The abstract, sentence by sentence
The face monoid described in [M1] acts on the integrable highest weight modules of a symmetrizable Kac-Moody algebra. It has similar structural properties as a reductive algebraic monoid whose unit group is a Kac-Moody group. We found in [M5] two natural extensions of the action of the Kac-Moody group on its building to actions of the face monoid on the building. Now we give an algebraic geometric model of one of these actions of the face monoid. The building is obtained as a part of the spectrum of homogeneous prime ideals of the Cartan algebra of the Kac-Moody group. We describe the full spectrum of homogeneous prime ideals of the Cartan algebra.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The face monoid described in [M1] acts on the integrable highest weight modules of a symmetrizable Kac-Moody algebra. | background 1.00 | 0.09 | 0.06 | asserted 1.00 |
| s1 | It has similar structural properties as a reductive algebraic monoid whose unit group is a Kac-Moody group. | background 0.94 | 0.12 | 0.06 | asserted 0.99 |
| s2 | We found in [M5] two natural extensions of the action of the Kac-Moody group on its building to actions of the face monoid on the building. | background 0.73 | 0.80 | 0.10 | asserted 1.00 |
| s3 | Now we give an algebraic geometric model of one of these actions of the face monoid. | contribution 0.99 | 0.94 | 0.39 | asserted 1.00 |
| s4 | The building is obtained as a part of the spectrum of homogeneous prime ideals of the Cartan algebra of the Kac-Moody group. | method 0.67 | 0.43 | 0.14 | asserted 1.00 |
| s5 | We describe the full spectrum of homogeneous prime ideals of the Cartan algebra. | contribution 0.86 | 0.93 | 0.19 | asserted 0.99 |
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Original abstract
The face monoid described in [M1] acts on the integrable highest weight modules of a symmetrizable Kac-Moody algebra. It has similar structural properties as a reductive algebraic monoid whose unit group is a Kac-Moody group. We found in [M5] two natural extensions of the action of the Kac-Moody group on its building to actions of the face monoid on the building. Now we give an algebraic geometric model of one of these actions of the face monoid. The building is obtained as a part of the spectrum of homogeneous prime ideals of the Cartan algebra of the Kac-Moody group. We describe the full spectrum of homogeneous prime ideals of the Cartan algebra.
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Those results play a significant role in the study of the face monoid associated to a Kac-Moody group (see [ref] ).
Imaginary cone and reflection subgroups of Coxeter groups · Section · 0.84
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