Gretskii O. S.
Ukr. Mat. Zh. - 1995. - 47, № 3. - pp. 424–428
The process of differentiation is studied for a class of mappings of regions of a Hilbert space. We introduce the concept of ℂCl-differentiability of a mapping at a point and establish sufficient conditions of ℂCl-differentiability.
Ukr. Mat. Zh. - 1994. - 46, № 10. - pp. 1336–1342
We study the monogeneity conditions for ?-differentiable mappings of domains of a Banach space and establish criteria of ?-differentiability of a mapping at a point.