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On a conjecture of ErdŐs, Pólya and Turán on consecutive gaps between primes

Let p_n denote the sequence of all primes and let d_n=p_n-p_{n-1} denote the sequence of all gaps between consecutive primes. In 1948 Erdős and Turán showed that d_{n+1}-d_n changes sign infinitely often and together with Pólya asked for a necessary and sufficient condition that a fixed linear combination of r>1 consecutive prime gaps d_{n+i} i=(1,2,...r) should change sign infinitely often as n runs through the sequence of all natural numbers. They conjectured that the condition is that the non zero values among the coefficients of the linear combination cannot all have the same sign but they could prove only much weaker relations. In the present work this conjecture is proved by the aid of the Maynard-Tao method and other important ideas of the recent work of W.D. Banks, T. Freiberg and J.Maynard (see arXiv:1404.59094v2).