Abstract
We prove that a u0–concave operator can include other concave operators, and derive a sufficient and necessary condition for the existence and uniqueness of the fixed point of a kind of u0–concave operator under a weaker condition.
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Supported by NSFC (10371068), NSFC(60174007) and Science Foundation of Shanxi Province (20041003)
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Liang, Z.D., Wang, W.X. & Li, S.J. On Concave Operators. Acta Math Sinica 22, 577–582 (2006). https://doi.org/10.1007/s10114-005-0687-1
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DOI: https://doi.org/10.1007/s10114-005-0687-1