# Relativistic functions (plasmapy.formulary.relativity)

Functionality for calculating relativistic quantities.

## Classes

 RelativisticBody(particle, V, momentum, *, ...) A physical body that is moving at a velocity relative to the speed of light.

## Functions

 Return the Lorentz factor. relativistic_energy(particle, V, *[, ...]) Calculate the sum of the mass energy and kinetic energy of a relativistic body.