Directional moduli of rotundity and smoothness
Michael O. Bartlett, John R. Giles, Jon D. Vanderwerff (1999)
Commentationes Mathematicae Universitatis Carolinae
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We study various notions of directional moduli of rotundity and when such moduli of rotundity of power type imply the underlying space is superreflexive. Duality with directional moduli of smoothness and some applications are also discussed.