Minimal non-orientable matroids of rank three |
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Institution: | 1. Graduate School of Information Science and Technology, The University of Tokyo, Japan;2. College of Humanities and Sciences, Nihon University, Japan |
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Abstract: | Minimal non-orientable matroids have been investigated as a threshold between orientability and non-orientability. The Fano matroid and the MacLane matroid are well-known minimal non-orientable matroids of rank 3. A natural question is whether there exists a minimal non-orientable matroid of every rank with elements. In this paper, we give an answer to the question in rank 3 that for every , there exists a minimal non-orientable matroid of rank 3 with elements. To prove this statement, we construct two new infinite families of minimal non-orientable matroids of rank 3. Furthermore we also investigate representability of the two infinite families. |
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