According to the website of College of Mathematics of Jilin University, the number of college mathematics textbooks depends on the major and curriculum requirements. According to the information provided, we can see different types of teaching material series, and each series contains different numbers of teaching materials. For example:

1, University Mathematics Series * * * has nine textbooks, including calculus, linear algebra, stochastic mathematics and other courses.

2. There are eight textbooks in the basic series of economic mathematics, including calculus, linear algebra, probability theory and mathematical statistics.

3. There are three series of engineering mathematics textbooks: mathematical physical equations, complex variable functions and integral transformations, and calculation methods.

4. Medical mathematics textbooks include medical advanced mathematics, medical advanced mathematics, etc. The number varies, but there are at least four. Therefore, there is no uniform answer to the question "How many college mathematics textbooks are there?". .