Mathematics – Combinatorics
Scientific paper
2012-01-06
Mathematics and Educations in Mathematics, v.37 (2008), 245-250
Mathematics
Combinatorics
7 pages
Scientific paper
The paper studies the set of all square binary matrices containing an exact number of 1's in each rows and in each column. A connection is established between the cardinal number of this set and the cardinal number of its subset of matrices containing 1 in the lower right corner. With the help of this result a new proof is advanced of the I. Good and J. Grook theorem. In connection with the firs result a classification has also been made of square binary matrices containing three 1's in each row and column and 1 in the lower right corner.
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