Abstract
The article deals with operator equations of type in a Banach space . If is only Lipschitz-continuous or locally bounded, then fixed-point theorems can be applied to bounded subsets of such as balls centered at u 0 or at the zero element Θ of . The article investigates the problem for which radius of the ball, the restrictions for admissible operators (Problem A) or admissible elements u 0 (Problem B) are as small as possible.
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