将CMSO归约为不可破坏图无法是可计算的
Reducing CMSO to Unbreakable Graphs Cannot be Computable
首次发表
浏览论文内容
中文总结 AI 辅助
该研究针对Lokshtanov等人2018年提出的CMSO公式测试的非构造性归约证明问题,证明无法将其构造性化,即参数q不能是φ的可计算函数。
中文摘要 AI 辅助
Lokshtanov、Ramanujan、Saurabh和Zehavi[ICALP 2018]证明,对任意CMSO公式φ,在任意图上测试φ可归约为在合适参数的(q,k)-不可破坏图上测试,其证明非构造性,他们询问能否使其构造性。我们证明这不可能:具体而言,参数q不能是φ的可计算函数。
英文摘要
Lokshtanov, Ramanujan, Saurabh, and Zehavi [ICALP 2018] proved that for any CMSO formula $ϕ$, testing $ϕ$ on arbitrary graphs can be reduced to testing it on $(q,k)$-unbreakable graphs for appropriate parameters. Their proof is non-constructive, and they ask whether it can be made constructive. We prove that this is impossible: specifically, the parameter $q$ cannot be a computable function of $ϕ$.