The textbook contains the basics of higher mathematics and computer science. The materials were prepared by the authors on the basis of the texts of lectures delivered by them over a number of years to students of various universities and forms of study in the disciplines: Higher Mathematics, Mathematics and Informatics, Information Systems, Databases and Expert Systems, Intelligent Information Systems, Informatics. The main attention is paid to those sections of mathematics and computer science, the knowledge of which is mandatory for modern specialists in economics.