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A combinatorial curiosity. (Et kombinatorisk kuriosum.) (Norwegian. English summary)
Normat. 57, No. 4, 170-172 (2009).
Summary: Given $n$ strands of black and white pearls, each of length $k$. Assume that each pair of strands agree in at least $m$ more positions than they disagree, and that at each position the excess number of pearls of one color over the other across the strands is at most $d$. The authors find a necessary condition on $n,k,m$ and $d$, and prove it both combinatorially and by linear algebra.
Classification: K25
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