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arXiv:2403.15496v1 Announce Type: new
Abstract: We call a class $\mathcal{M}$ of matroids hereditary if it is closed under flats. We denote by $\mathcal{M}^{ext}$ the class of matroids $M$ that is in $\mathcal{M}$, or has an element $e$ such that $M \backslash e$ is in $\mathcal{M}$. We prove that if $\mathcal{M}$ has finitely many forbidden flats, then so does $\mathcal{M}^{ext} $.
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