Supported by the National Natural Science Foundation of China(11201107,11271283,11501435);Supported by the Natural Science Foundation of Anhui Province(1208085QA01)
It is proved that if λ1,λ2,…,λ7 are nonzero real numbers, not all of the same sign and not all in rational ratios, then for any given real numbers η and σ, 0 〈 σ 〈 1/16, the inequality |λ1x1^2+λ2x2^2+∑i...