Journal of Combinatorial Theory Series B ( IF 1.4 ) Pub Date : 2023-09-04 , DOI: 10.1016/j.jctb.2023.08.004 Nick Brettell , James Oxley , Charles Semple , Geoff Whittle
Let M be an excluded minor for the class of -representable matroids for some partial field , let N be a 3-connected strong -stabilizer that is non-binary, and suppose M has a pair of elements such that is 3-connected with an N-minor. Suppose also that and is not N-fragile. In the prequel to this paper, we proved that is at most five elements away from an N-fragile minor. An element e in a matroid is N-essential if neither nor has an N-minor. In this paper, we prove that, under mild assumptions, is one element away from a minor having at least elements that are N-essential.
中文翻译:
被排除在外的未成年人几乎是脆弱的二:基本要素
设M为该类别的排除未成年人- 某些部分场的可表示拟阵,令N为 3 连通强-非二元稳定器,假设M有一对元素这样是 3 与N小调相连。还假设和不是N-脆弱的。在本文的前传中,我们证明了距N脆弱小数最多五个元素。拟阵中的元素e是N-必需的,如果两者都不是也不有N小调。在本文中,我们证明,在温和的假设下,距离未成年人至少有一个元素N必需的元素。