(3.15.1)

(3.15.2)

(3.15.3)

(3.15.4)

Equations (3.15.1) – (3.15.4) can also be expressed as

(3.15.5)

(3.15.6)

(3.15.7)

(3.15.8)

There are three supplementary equations

(3.15.9)

(3.15.10)

(3.15.11)

And the density of electromagnetic energy

(3.15.12)