The Maxwell equations are the set of four fundamental equations governing electromagnetism (i.e., the behavior of electric and magnetic fields). They were first written down in complete form by physicist James Clerk Maxwell, Eric Weisstein's World of Biography who added the so-called displacement current term to the final equation, although steady-state forms were known earlier.
For time-varying fields, the differential form of these equations in cgs is
Conductor, Dielectric, Maxwell Equations--Dielectric, Maxwell Equations--Steady State
References
Jackson, J. D. Classical Electrodynamics, 3rd ed. New York: Wiley, p. 177, 1998.
Zwillinger, D. Handbook of Differential Equations, 3rd ed. Boston, MA: Academic Press, p. 138, 1997.