Addition, subtraction, multiplication and division can be said to be the basis of mathematics, which is often used in our daily life. After that, mathematics is actually to lay the foundation for other disciplines. Such as accounting, chemistry, electronic engineering and so on. Mathematics is becoming more and more difficult because it is no longer a universal foundation. Calculus, vectors, etc. , is used in all aspects. More profound mathematics is actually learned because it is used in other aspects, so if you want to understand more profound mathematics, you must have other knowledge.