On common divisors of multinomial coefficients

Details On common divisors of multinomial coefficients On common divisors of multinomial coefficients

2008-06-03

arxiv.org/abs/0806.0607v2

Mathematics

Number Theory

13 pages. Copy at http://math.berkeley.edu/~gbergman/papers may be updated more frequently than arXiv copy. I've "trimmed the

Scientific paper

Erd\H{o}s and Szekeres showed in 1978 that for any four positive integers satisfying m_1+m_2 = n_1+n_2, the two binomial coefficients (m_1+m_2)!/m_1! m_2! and (n_1+n_2)!/n_1! n_2! have a common divisor >1. The analogous statement for families of k k-nomial coefficients (k>1) was conjectured in 1997 by David Wasserman. Erd\H{o}s and Szekeres remark that if m_1, m_2, n_1, n_2 as above are all >1, there is probably a lower bound on the common divisor in question which goes to infinity as a function of m_1+m_2. Such a bound is here obtained. Results are proved that narrow the class of possible counterexamples to Wasserman's conjecture. On the other hand, several plausible generalizations of that conjecture are shown to be false.

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