On the Weak Order of Orthogonal Groups |
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Authors: | Annette Pilkington |
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Institution: | 1. Department of Mathematics , University of Notre Dame , Notre Dame , Indiana , USA pilkington.4@nd.edu |
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Abstract: | A complete lattice structure is defined on the underlying set of the orthogonal group of a real Euclidean space, by a construction analogous to that of the weak order of Coxeter systems in terms of root systems. This produces a complete rootoid in the sense of Dyer, with the orthogonal group as underlying group. It is shown that this complete lattice has a saturation property which is used along with other properties of the lattice to characterize the maximal totally ordered subsets of the lattice as collections of initial sections with respect to a total ordering on the positive roots. |
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Keywords: | Convex cone Groupoid Lattice Orthogonal group Root system Weak order |
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