: Serves as the mathematical backbone, covering coordinate systems (Cartesian, cylindrical, spherical), vector calculus, and fundamental theorems like the Divergence Theorem and Stokes' Theorem .
Review and Analysis of Electromagnetic Field Theory by S. Dhananjayan
And next to the Ampere-Maxwell Law: “Even in empty space, a ghost current hides. A changing electric field is a liar who pretends to be a current.”