blackpussyimage:


EXPLANATION: in special relativity, the electric and magnetic fields are combined into a single object: a second rank tensor field that turns out to be asymmetric (a mathematical property). The usefulness of it is, the four famous Maxwell equations (and hence the theory of classical electromagnetism, and hence “light”) can be expressed concisely by the divergence of this tensor field, which is zero (since it is a covariant quantity).

Isinweke:
Hmm