Two of the authors proved a well-known conjecture of K. Wagner, that in any infinite set of finite graphs there are two graphs so that one is a minor of the other. A key lemma was a theorem about the structure of finite graphs that have no $K_n$ minor for
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格式 PDF ● 网页 103 ● ISBN 9781470401450 ● 出版者 American Mathematical Society ● 下载 3 时 ● 货币 EUR ● ID 6612765 ● 复制保护 Adobe DRM
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