力学中的叠加原理用英文怎么表述,要原理

Superposition principle
http://en.wikipedia.org/wiki/Superposition_principle

the superposition principle refers to two related ideas in linear systems.

The first version[1] of the superposition principle states that, for a linear system of the form F(x)=0 (sometimes called homogeneous), any sum (or more generally, linear combination) of solutions to the system is also a solution to the same system:

IF , THEN
An important application of this is to waves, which are often described by wave equations of this form. For example, in electromagnetic theory, ordinary light is described as a superposition of waves of different frequency and polarization, moving in different directions.

The second version of the superposition principle states that, for a linear system of the form F(x)=r, where x is some sort of stimulus and r is so