



















We prove that the transfer digraph ${\cal D}^*_{C,m}$ needed for the enumeration of 2-factors in the thin cylinder $TnC_{m}(n)$, torus $TG_{m}(n)$ and Klein bottle $KB_m(n)$ (all grid graphs of the fixed width $m$ and with $m \cdot n$ vertices), when $m$ is odd, has only two components of order $2^{m-1}$ which are isomorphic. When $m$ is even, ${\cal D}^*_{C,m}$ has $ \left\lfloor \frac{m}{2} \right\rfloor + 1$ components which orders can be expressed via binomial coefficients and all but one of the components are bipartite digraphs. The proof is based on the application of recently obtained results concerning the related transfer digraph for linear grid graphs (rectangular, thick cylinder and Moebius strip).
此内容由惯性聚合(RSS阅读器)自动聚合整理,仅供阅读参考。 原文来自 — 版权归原作者所有。