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Published online by Cambridge University Press: 09 April 2009
If m and n are natural numbers satisfying 1 ≦ m < n let denote the least integer k such that the statement: ‘Every (0,1) matrix with n columns, with constant row-sum m, and with at least k distinct rows, has rank n’ is true. Then
=
+1 for m ≧ 2, n ≧ m2 + 2. Further,
for 1 ≦ m < n.