Invariants of tensors

A tensor is a type of math object that has several properties that stay the same even when it is moved around or changed in a certain way. These properties are called 'invariants'. Invariants are like markers that are attached to the tensor that stay the same no matter what. Invariants help to identify the tensor and tell how it will behave when it's changed. For example, a tensor may have two invariants that are written as numbers: one for how much it can stretch and one for how much it can be bent. These numbers will never change, even if the tensor is moved or twisted in different ways. Even though the tensor may look different, the invariants are still the same.