It is very difficult to learn all math well. Because mathematics includes many aspects, such as mathematical foundation, number theory, algebra, geometry, topology, function theory, dynamic system, probability theory, operational research, fuzzy mathematics and so on. You can't know everything. Most scientists only study one branch!

Don't underestimate a branch, each branch contains several courses! For example, the topology includes:

1, point set topology

2. Algebraic topology

3. Homotopy theory

4, low-dimensional topology

5. Homology theory

6. Dimension theory

7. Topology on a Lattice

8. Fiber bundle theory

9. Geometric topology

10, singularity theory

1 1, differential topology

12, other disciplines of topology

I think I asked my teacher, who specializes in fuzzy mathematics, and I feel very powerful!

You can ask questions and forget to adopt them!