) change when you rotate your view, the underlying physical object (the arrow itself) does not change. 4. Essential Tools for Vector Calculus

Using Cartesian Tensor notation simplifies complex vector identities:

A tensor is more than just a grid of numbers; it is defined by how its components transform when you rotate your coordinate system. Often represented as

otherwise. It acts as the identity matrix in tensor notation. 3. Understanding Cartesian Tensors

A single value that stays the same no matter how you rotate your axes (e.g., temperature, mass).