How can higher mathematics be divided into a, B, C, D, e, f? What do they stand for

How can higher mathematics be divided into a, B, C, D, e, f? What do they stand for

The difference is the depth of the content. A is the highest. It's usually in the school of mathematics and the school of software and electronics. It's difficult and much to learn. F is usually in the school that has nothing to do with mathematics, and little to learn

What exactly does the C in C [a, b] mean?

Consciousness of continuous function class, C [a, b] denotes continuous function on [a, b]

What does high number (a ∩ b) C mean
C is superscript

The complement (or coset) of the intersection of a subset and B subset is the sign (a ∩ b) ^ C in mathematics