Tensor operator

A tensor operator is a mathematical object that transforms according to specific rules under transformations of the coordinate system, such as rotations, translations, or Lorentz transformations. In quantum mechanics and quantum field theory, tensor operators are crucial for understanding how physical quantities transform and interact, particularly in the context of angular momentum and spin. **Key Features of Tensor Operators:** 1. **Rank and Type**: Tensor operators are characterized by their rank (degree) and type.