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Bases in oriented matroids |
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| Authors: | Michel Las Vergnas |
| Affiliation: | Centre National de la Recherche Scientifique, Université Pierre et Marie Curie, V.E.R. 48, 4 place Jussieu, 75230 Paris Cedex 05, France |
| Abstract: | Let M be an oriented matroid. One can define exactly two assignments of +1 and ?1 to permutations of bases of M canonically associated with the orientation of M. |
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