Orudzhev G. D.
Ukr. Mat. Zh. - 1994. - 46, № 7. - pp. 952–955
We study the Cauchy problem for higher-order operator-differential equations in a Banach space and construct polynomial approximations of its solutions.
Ukr. Mat. Zh. - 1993. - 45, № 3. - pp. 440–442
Polynomial approximations are constructed for the solutions of differential equations of the first and second order in a Banach space for which the Cauchy problem is stated correctly.