
doi: 10.1007/bf00970495
The author proves, by using a constructive method, that for any non- separable Banach space \(X\) with uncountable biorthogonal system there can be determined sublinear operators defined on \(X\), which do not have subdifferentials.
Derivatives of functions in infinite-dimensional spaces, uncountable biorthogonal system, Nonsmooth analysis, sublinear operators, constructive method, subdifferentials
Derivatives of functions in infinite-dimensional spaces, uncountable biorthogonal system, Nonsmooth analysis, sublinear operators, constructive method, subdifferentials
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