A note on the number of -Diophantine quadruples
Florian Luca, Volker Ziegler (2014)
Communications in Mathematics
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Let be an -tuple of positive, pairwise distinct integers. If for all the prime divisors of come from the same fixed set , then we call the -tuple -Diophantine. In this note we estimate the number of -Diophantine quadruples in terms of .