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distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract In the paper, we find the greatest values α 1 , α 2 , α 3 , α 4 and the least values β 1 , β 2 , β 3 , β 4 such that the double inequalities α 1 A(a, b) + (1 − α(More)
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