Abstract
For a subsetM of a normed vector spaceX, it is shown that, in the characterization given by Elster and Thierfelder of Clarke's tangent cone toM at a pointx 0∈X, there is a requirement which becomes superfluous whenx 0 belongs to the closure ofM.
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Communicated by F. Giannessi
This research was supported by the Italian Ministry of University Scientific and Technological Research.
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Giorgi, G., Guerraggio, A. On a characterization of Clarke's tangent cone. J Optim Theory Appl 74, 369–372 (1992). https://doi.org/10.1007/BF00940900
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DOI: https://doi.org/10.1007/BF00940900