Abstract
It is shown that the set of points at which a real valued function of a real variable is qualitatively continuous and finitely qualitatively symmetrically differentiable but not qualitatively differentiable is a -symmetrically porous set.
Citation
Michael J. Evans. Robert W. Vallin. "QUALITATIVE SYMMETRIC DIFFERENTIATION." Real Anal. Exchange 18 (2) 575 - 585, 1992/1993. https://doi.org/10.2307/44152307
Information