How to digest new math more quickly?
I suggest the following points:
- Try to find the general (universal) pattern common in several concepts. For example, a homomorphism between two groups preserves the group multiplication and group multiplications are the only composition rule in groups. Then it is easy to learn a homomorphism should be in between two algebras, rings, vector spaces, etc. Maybe the names change but the underlying concepts are similar.
- Take notes during reading new concepts, theorems, etc.
- Try to generalize the statements.
- Find the relationship between different concepts, definitions, statements, etc.
- Try to solve some exercises, especially those which make you to review the content of the course (book, lecture, paper, etc).
- Give a presentation or teach a course.