Stability and exact Turán numbers for matroids
Stability and exact Turán numbers for matroids
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拟阵的稳定性和精确图兰数
DOI:
10.1016/j.jctb.2019.11.004
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Liu H
中科院分区:
文献类型:
--
作者:
Liu H
We consider the Turán-type problem of bounding the size of a set M⊆ F 2 n that does not contain a linear copy of a given fixed set N⊆ F 2 k, where n is large compared to k. An Erdős-Stone type theorem [5] in this setting gives a bound that is tight up to a o (2 n) error term; our first main result gives a stability version of this theorem, showing that such an M that is close in size to the upper bound in [5] is close to the obvious extremal example in the sense of symmetric difference. Our second result shows that the error term in [5] is exactly controlled by the solution to one of a class of ‘sparse’extremal problems, and gives some examples where the error term can be eliminated completely to give a sharp upper bound on| M|.
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