The textbook includes all sections of the course of the same name, read at the mathematical and physical-mathematical faculties of higher pedagogical educational institutions of the Russian Federation. The textbook is intended for students studying in undergraduate areas 440305 - Pedagogical education (profiles "Mathematics," "Informatics," "Mathematics and informatics," "Informatics and mathematics," "Mathematics and economics"), as well as 010100 - Mathematics (profile "Teaching mathematics and informatics").