» This article describes the use of the term nonlinearity in mathematics. For other meanings, see nonlinearity (disambiguation). In mathematics, a nonlinear system is a system which isn't linear, for example a system which doesn't satisfy the superposition principle. Less technically, a nonlinear system is any problem where the variable(s) to be solved for can't be written as a linear sum of independent components. A nonhomogenous system, which is linear apart from the presence of a function of… (More on Nonlinear)