An elementary proof of the preservation of Lipschitz constants by the Meyer-König and Zeller operators.
Convex solutions of a nonlinear integral equation of Urysohn type.
Note on certain inequalities for means in two variables.
Some new inequalities for means of two arguments.
Singularities and equicontinuity of certain families of set-valued mappings
In the present paper we establish an abstract principle of condensation of singularities for families consisting of set-valued mappings. By using it as a basic tool, the condensation of the singularities and the equicontinuity of certain families of generalized convex set-valued mappings are studied. In particular, a principle of condensation of the singularities of families of closed convex processes is derived. This principle immediately yields the uniform boundedness theorem stated in [1, Theorem...
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