Abstract:
This article has a survey character. It contains: 1. The Sowalter approach, 2. The Sidorov approach, 3. Applications of the Showalter–Sidorov problem, 4. A generalization of the Showalter–Sidorov problem.
Keywords:the Cauchy problem, the Showalter–Sidorov problem, initial-finish value problem, the Sobolev-type equations.