Mathematics – Combinatorics
Scientific paper
2012-02-02
Mathematics
Combinatorics
19 pages, 13 figures
Scientific paper
Some numerical characteristics of bipartite graphs in relation to the problem of finding all disjoint pairs of S-permutation matrices in the general $n^2 \times n^2$ case are discussed in this paper. This is done in conjunction with the popular Sudoku puzzle. Demonstrating the referred assertions, the cardinality of the sets of mutually disjoint S-permutation matrices in both the $4 \times 4$ and $9 \times 9$ cases are calculated. All bipartite graphs of the type $g=< R_g \cup C_g, E_g>$, where $|R_g |=|C_g |=2$ or $|R_g |=|C_g |=3$ are shown.
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