Correction

In my article (A. E. Martynyuk, DAN, vol. 117, no. 3, 1957) the following corrections should be made:

Page 374, line 7, and page 375, line 1 from the bottom: printed \(H\), should read \(H_0\).

Page 375, inequality (10): printed \(\|u\|\), should read \(\|u\|_1\).

Page 376, line 2: printed \((u, f)\), should read \((A_1u, f)\).

Page 376, formula (12) should be written in the form

\[ (A_1u, f) = [u, u_0]_1,\qquad u \in H_1. \]

Page 376, line 4 from the bottom: printed

\[ \frac{d^{k+1}}{dx^{k+1}}, \]

should read

\[ \frac{d^{k+1}u}{dx^{k+1}}. \]

A. E. Martynyuk