Fuzzy Principles and Characterization of Trustworthiness

We show that (a) the basic principles of subdifferential calculus (various local and global fuzzy principles, multidirectional mean value theorem, extremal principle) which are shown to be equivalent for β-subdifferentials are in fact equivalent for any subdifferential and (b) for ε-versions of β-subdifferentials these principles turn out to be also equivalent to the properties of the space to be a trustworthy or a subdifferentiability space (with respect to a given subdifferential).

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