Посилання:A sharp angle inequalities for pairs of elliptic operators in the case of domain with a conical point / R.M. Dzhafarov // Нелинейные граничные задачи: сб. науч. тр. — 1999. — Т. 9. — С. 40-45. — Бібліогр.: 2 назв. — англ.
A sharp angle inequality is used in a proof of solvability of a general nonlinear elliptic problem with applying of topological methods. Our proof is founded at reducing to the inequality in the case of a domain with a smooth boundary.