The applied mathematics — the area of mathematics considering application of mathematical knowledge in other fields of activity. Examples of such application will be: numerical methods, the mathematical physics, linear programming, optimisation and research of operations, modelling of continuous environments (Mechanics of continuous environments), biomathematics and biocomputer science, the information theory, the theory of games, probability theory and statistics, the financial mathematics and the insurance theory, cryptography, and consequently combination theory and somewhat final geometry, the theory of counts in the appendix to network planning, and in many respects that is called as computer science. In a question that is applied mathematics, it is impossible to make accurate logic classification. Mathematical methods are usually applied to a specific class of applied problems by drawing up of mathematical model of system.