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- W2029401102 abstract "In [Journal of Statistical Planning and Inference (141) (2011) 3697-3704], Roberto Fontana offers an algorithm for obtaining Sudoku matrices. Introduced by Geir Dahl concept disjoint pairs of S-permutation matrices [Linear Algebra and its Applications (430) (2009) 2457-2463] is used in this algorithm. Analyzing the works of G. Dahl and R. Fontana, the question of finding a general formula for counting disjoint pairs of $n^2 times n^2$ S-permutation matrices as a function of the integer $n$ naturally arises. This is an interesting combinatorial problem that deserves its consideration. The present work solves this problem. To do that, the graph theory techniques have been used. It has been shown that to count the number of disjoint pairs of $n^2 times n^2$ S-permutation matrices, it is sufficient to obtain some numerical characteristics of the set of all bipartite graphs of the type $g=<R_g cup C_g, E_g>$, where $V=R_g cup C_g$ is the set of vertices, and $E_g$ is the set of edges of the graph $g$, $R_g cap C_g =emptyset$, $|R_g|=|C_g|=n$." @default.
- W2029401102 created "2016-06-24" @default.
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- W2029401102 date "2013-12-01" @default.
- W2029401102 modified "2023-09-29" @default.
- W2029401102 title "On the number of disjoint pairs of S-permutation matrices" @default.
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- W2029401102 doi "https://doi.org/10.1016/j.dam.2013.06.007" @default.
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