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Maor, Eli. Pentagons and pentagrams: an illustrated history / text by Eli Maor ; illustrated by Eugen Jost. — 1 online resource (201 pages) — <URL:http://elib.fa.ru/ebsco/3220412.pdf>.Дата создания записи: 16.07.2022 Тематика: Pentagon.; Pentacles.; Mathematics — History.; Pentagones.; Pentacles.; Mathématiques — Histoire.; pentagons.; MATHEMATICS — Geometry — General.; MATHEMATICS — History & Philosophy.; Mathematics.; Pentacles.; Pentagon. Коллекции: EBSCO Разрешенные действия: –
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Аннотация
A fascinating exploration of the pentagon and its role in various culturesThe pentagon and its close cousin, the pentagram, have inspired individuals for the last two and half millennia, from mathematicians and philosophers to artists and naturalists. Despite the pentagon's wide-ranging history, no single book has explored the important role of this shape in various cultures, until now. Richly illustrated, Pentagons and Pentagrams offers a sweeping view of the five-sided polygon, revealing its intriguing geometric properties and its essential influence on a variety of fields. Traversing time, Eli Maor narrates vivid stories, both celebrated and unknown, about the pentagon and pentagram. He discusses the early Pythagoreans, who ascribed to the pentagon mythical attributes, adopted it as their emblem, and figured out its construction with a straightedge and compass. Maor looks at how a San Diego housewife uncovered four previously unknown types of pentagonal tilings, and how in 1982 a scientist's discovery of fivefold symmetries in certain alloys caused an uproar in crystallography and led to a Nobel Prize. Maor also discusses the pentagon's impact on many buildings, from medieval fortresses to the Pentagon in Washington, D.C. Eugen Jost's superb illustrations provide sumptuous visual context, and the book's puzzles and mazes offer fun challenges for readers, with solutions given in an appendix.
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Оглавление
- Cover
- Contents
- Preface. Why the Pentagon?
- 1. Five
- 2. ϕ
- Sidebar 1. Four Famous Irrational Numbers: 2, ϕ, e, and π
- 3. But Is It Divine?
- 4. Constructing the Regular Pentagon
- Sidebar 2. Pentagonal Numbers
- 5. The Pentagram
- Centerpiece. Color Plates
- 6. Pentastars
- Sidebar 3. Pentagonal Puzzles and Curiosa
- 7. Tessellations: Defying the Impossible
- 8. The Discovery of Fivefold Symmetry in Crystals
- Sidebar 4. An Unsolved Mystery
- 9. Oh, That Pentagon
- Appendixes
- A. The Elementary Euclidean Constructions
- B. Three Properties of the Fibonacci Numbers
- C. A Proof That There Exist Only Five Platonic Solids
- D. Summary of Formulas
- E. Solutions to Puzzles
- Bibliography
- Credits
- Index
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