A Pseudoconfiguration of Points without Adjoint
نویسندگان
چکیده
We give an example of a simple oriented matroid D that admits an oriented adjoint. Already any adjoint of the underlying matroid D, however, does itself not admit an adjoint. D arises from the wellknown Non-Desargues-Matroid by a coextension by a coparallel element and, hence, has rank 4. The orientability of D and some of its adjoints follows from an apparantly new oriented matroid construction given in the paper that is a very special case of an amalgam of two copies of one oriented matroid.
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عنوان ژورنال:
- J. Comb. Theory, Ser. B
دوره 68 شماره
صفحات -
تاریخ انتشار 1996