Electromagnetism, Optics and Continuum Mechanics

Earnshaw's theorem states that a collection of point charges cannot be maintained in a stable stationary equilibrium configuration solely by the electrostatic interaction of the charges.

In electrodynamics, Poynting's theorem is a statement of conservation

In physics, in the context of electromagnetism, Birkhoff's theorem concerns spherically symmetric

The electromagnetism uniqueness theorem states the uniqueness (but

The Malus-Dupin theorem is a theorem in geometrical optics discovered by Étienne-Louis Malus in 1808 and

\sigma _{\mathrm {tot} }} includes both elastic and inelastic scattering. The generalized optical theorem

In optics, the Ewald-Oseen extinction theorem, sometimes

The Shockley-Ramo theorem is a method for calculating the electric current induced by a charge moving in the vicinity

is one of several results that restrict the type of magnetic fields that may be produced by dynamo action.

In fluid mechanics, Kelvin's circulation theorem states:In a barotropic

In fluid mechanics, the Taylor-Proudman theorem (after Geoffrey

net displacement in a low-Reynolds number Newtonian fluid environment, i.e. a fluid that is highly viscous.

The Kutta-Joukowski theorem is a fundamental theorem in aerodynamics that relates the lift per unit span of an airfoil

Betti's theorem, also known as Maxwell-Betti reciprocal work theorem, discovered by

In the linear theory of elasticity Clapeyron's theorem states that the potential

In civil engineering and structural analysis Clapeyron's theorem of three moments (by Émile