Cách sử dụng
The word 'invariant' is used to describe something that never changes, no matter what. For example, if you are taking a math class and your teacher tells you that the sum of two plus two is always four, that is an invariant rule. In other words, the answer will never change no matter how many times you add those numbers together. Another example might be a physical law like the law of gravity, which always works the same way no matter where you are or what you are doing. So, when you see or hear the word 'invariant', you can think of something that is constant and unchanging.