错排问题是组合数学中禁位排列的重要内容.基于3行拉丁矩计数问题的考虑,提出了条件更强的错排问题,即所谓的二重错排问题,并给出二重错排的相关计数公式及其在3行拉丁矩计数问题中的应用.同时给出ménage问题的2种推广形式.
Derangement is one of the important aspects of the forbidden ranking in combinatorics.Considering the enumeration of three-line Latin rectangles,in this paper,we raise the problem of derangements with stronger restrictions,the so called double derangements,and give related formulas of the enumeration of double derangements and its application in the enumeration of three-line Latin rectangles.In addition,we also bring forth two problems regarding generalization of the ménage.