“…The inequality (3.7) clearly cannot hold for N large enough if we choose η < δ(1−δ)/2, since n < (1 + η)N and, by a result of Balog and Ono [5] or of Alkan [1], the gapñ − n is O(n c ), for some c < 1. In conclusion, for N sufficiently large, the set S E,r,δ,η,N is empty.…”