Models of information system layers

Models of information system layers as a scheme, algebraic expressions and computer model were created. Algebraic model of information system layers is synthesized by means of algebraic algorithms and modified systems of algorithmic algebras. A computer model of layers is created in environment Microsoft Visual Studio .NET. A four-layer model of abstract information system in the form of diagrams, mathematical formulas and models of computer system was created. Comparison of object models is performed.