The GDZ (Готовые домашние задания - Prepared Homework Solutions) for Aleksei Fedorovich Filippov's book, (Collection of Problems on Differential Equations), is a widely used resource for students in technical universities and mathematics departments. Online Solutions and Resources
: Provides a similar catalog where solutions are grouped by topic, such as isoclines, separable variables, and homogeneous equations. (Collection of Problems on Differential Equations)
The collection is known for its rigor and covers essential topics in differential equations, including: such as isoclines
: Hosts downloadable files (often in DJVU or PDF format) that contain scanned versions of manually solved problems from the collection. Content of the Problem Book (Collection of Problems on Differential Equations)