The first is SS, an innovative class, which has a large difficulty coefficient and is suitable for students with strong interest in mathematics. The second is the diligent thinking class S, which is suitable for children with a solid foundation in and out of class (most of them have had the foundation of Olympic Mathematics). The third kind is A+ in sensitive classes, which is the children who get excellent grades in knowledge classes and are exposed to this kind of Olympic Mathematics courses for the first time.

Gaosi Education is an extracurricular tutoring institution for primary and secondary schools. It's really an old brand. It provides offline one-on-one tutoring, just like asking a tutor, but it is more formal, and the charge should be several hundred yuan for a class. However, even in the same educational institution, teachers at different levels have different services and different fees, so there is no standard answer to this question.

Mathematics is a universal means for human beings to strictly describe the abstract structure and mode of things, and can be applied to any problem in the real world. All mathematical objects are artificially defined in essence. In this sense, mathematics belongs to formal science, not natural science. Different mathematicians and philosophers have a series of views on the exact scope and definition of mathematics.