Variational method is a branch of mathematics used to find the minimum and maximum values of functions.

The Riemann sum is a method for approximately calculating the integral of a function.

Based on the Air Pollution Control Law, factories must strengthen the management of exhaust gases.

The steepest descent method is one way to solve optimization problems.

He continued to hide his talents as if to hide his light and conceal his tracks.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.