Proper noun
superposition principle
(mathematics, physics) The principle stating that for a linear system, the net response is the sum of the response associated with each individual input.
Synonym: superposition property
The analysis of linear systems is possible because they satisfy a superposition principle: if u(t) and w(t) satisfy the differential equation for the vector field (but not necessarily the initial condition), then so will u(t) + w(t). Source: Internet
The solution to this system can be found by using the superposition principle (linearity). Source: Internet