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The reference book is distinguished by maximum clarity: almost every statement of elementary mathematics is illustrated with a corresponding figure. The book will help students of schools, lyceums and gymnasiums, regardless of which textbooks and curriculum they use, to visualise the material and quickly find the necessary information. Such a reference book on students' desks will allow the teacher to free up lesson time for solving problems, and graduates and applicants will be able to see the subject of mathematics as a whole and systematise their knowledge.