Введение в книгу : This compact book is a strong choice for readers who want to understand mathematics, formal reasoning, and problem solving with more structure and confidence. For buyers comparing many titles, this is a sensible choice when they want one organized source instead of scattered online notes. At 114 pages, it is compact enough for focused reading while still giving buyers a useful reference. Published in 2021, it remains a strong choice for readers who want a relevant and dependable learning resource. Ideal for students, researchers, engineers, and readers who need a serious mathematical reference, it helps turn interest into a more serious learning plan and makes a useful addition to a professional bookshelf.