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Volume 10, Issue 1, Article 11 |
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Necessary and Sufficient Conditions for Joint Lower and Upper Estimates
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Authors: |
Laszlo Leindler, |
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Keywords:
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Sequences and series, inequalities, power-monotonicity. |
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Date Received:
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28/02/08 |
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Date Accepted:
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17/01/09 |
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Subject Codes: |
40A30, 40A99.
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Editors: |
Sever S. Dragomir, |
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Abstract: |
Necessary and sufficient conditions are given for joint lower and upper estimates of the following sums  and  . An application of the results yields necessary and sufficient conditions for a pleasant and useful lemma of Sagher.
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