
 Mathematical model  Wikipedia, the free encyclopedia 
  models are used particularly in the natural sciences and engineering disciplines (such as physics, biology, and electrical engineering) but also in the social sciences (such as economics, sociology and political science); physicists, engineers, computer scientists, and economists use mathematical models most extensively. 
  Linear vs. nonlinear: Mathematical models are usually composed by variables, which are abstractions of quantities of interest in the described systems, and operators that act on these variables, which can be algebraic operators, functions, differential operators, etc. If all the operators in a mathematical model present linearity, the resulting mathematical model is defined as linear. 
  Mathematical modelling problems are often classified into fl box or white box models, according to how much a priori information is available of the system. 
 en.wikipedia.org /wiki/Mathematical_model (1928 words) 
