(3,11)和(4,7)笼的计算确定
Computational determination of (3,11) and (4,7) cages
摘要:
(k,g)-图是围长为g的k-正则图,(k,g)-笼是最小阶的(k,g)-图.我们证明了Balaban在1973年发现的一个112阶(3,11)-图是极小的,并且是唯一的.我们还证明了(4,7)-笼的阶数是67,并找到了一个例子。最后,我们将(3,13)-笼和(3,14)-笼阶的下界分别提高到202和260.所使用的方法是启发式爬山和创新的回溯搜索相结合。
英文摘要:
A (k,g)-graph is a k-regular graph of girth g, and a (k,g)-cage is a (k,g)-graph of minimum order. We show that a (3,11)-graph of order 112 found by Balaban in 1973 is minimal and unique. We also show that the order of a (4,7)-cage is 67 and find one example. Finally, we improve the lower bounds on the orders of (3,13)-cages and (3,14)-cages to 202 and 260, respectively. The methods used were a combination of heuristic hill-climbing and an innovative backtrack search.
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