Counting finite lattices

被引:21
|
作者
Heitzig, J [1 ]
Reinhold, J [1 ]
机构
[1] Univ Hannover, Inst Math, D-30167 Hannover, Germany
关键词
orderly algorithm; (un-)labeled lattice; tree; canonical; levelized;
D O I
10.1007/PL00013837
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
The correct values for the number of all unlabeled lattices on n elements are known for n less than or equal to 11. We present a fast orderly algorithm generating all unlabeled lattices up to a given size n. Using this algorithm, we have computed the number of all unlabeled lattices as well as that of all labeled lattices on an n-element set for each n less than or equal to 18.
引用
收藏
页码:43 / 53
页数:11
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