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RETRACTIONS TO PSEUDOFORESTS

机译:伪造林的撤回

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摘要

For a fixed graph H, let Ret(H) denote the problem of deciding whether a given input graph is retractable to H. We classify the complexity of Ret(H) when H is a graph (with loops allowed) where each connected component has at most one cycle, i.e., a pseudoforest. In particular, this result extends the known complexity classifications of Ret(H) for reflexive and irreflexive cycles to general cycles. Our approach is based mainly on algebraic techniques from universal algebra that previously have been used for analyzing the complexity of constraint satisfaction problems.
机译:对于固定图H,让Ret(H)表示确定给定输入图是否可伸缩到H的问题。当H是一个图(允许循环)时,每个连接的组件都有最多一个周期,即一个伪林。特别地,该结果将自反循环和非自反循环的Ret(H)的已知复杂度分类扩展到普通循环。我们的方法主要基于通用代数的代数技术,该技术以前已用于分析约束满足问题的复杂性。

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