Spherical triangle belongs to non-Euclidean geometry, and the geometry in middle school is Euclidean geometry, and non-mathematics majors generally don't touch it.

The first floor is a mathematics major, so the branches of mathematics he introduced are relatively theoretical, such as:

1, mathematical analysis

2. Advanced Algebra

3. Real variable function

4. number theory

5. Mathematical experiment

6. General calculus

7. Partial differential calculus

8, random process

9, microcomputer principle and so on.

I study engineering. From the practical point of view of engineering, mathematics has the following branches:

1, calculus (advanced mathematics, similar to mathematical analysis, including function, derivative and differential, differential mean value theorem, integral, ordinary differential equation, vector algebra and spatial analytic geometry, partial derivative and multiple integral, surface integral, curve integral, series, etc. );

2. Linear algebra (mainly matrix learning, including matrix theory in postgraduate stage).

3. Discrete mathematics (study logic, set, graph theory, algebraic structure, etc.). , is the basis of computer science)

4. Theory of complex variable function (studying the properties of complex numbers)

5. Integral transformation (based on complex variable function, solving differential equations with complex number method is the mathematical basis of electrical discipline and its automation)

6, probability theory and mathematical statistics (study the probability and statistics of random events)