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
Several platforms provide free online access to step-by-step solutions for the problems in this collection: (Collection of Problems on Differential Equations)
: Provides a similar catalog where solutions are grouped by topic, such as isoclines, separable variables, and homogeneous equations. such as isoclines