». Поскольку математика является обязательным предметом всех систем образования во всех странах мира, каждый человек на Земле, ходивший в школу, так или иначе познакомился с «Началами» через тексты учебников математики.
ЕВКЛИД АЛЕКСАНДРИЙСКИЙ (325–265 гг. до н. э.)
Несмотря на видное место Евклида в истории математики, о его жизни известно мало. Более того, его часто путают с другим Евклидом (из Мегары). Евклид Александрийский родился около 325 г. до н. э. и, по имеющимся данным, уже в возрасте 25 лет стал директором математического отдела музея Александрии. Это заведение было «прибежищем муз» и было больше похоже на библиотеку и колледж, чем на достопримечательность. Действительно, это был крупный научный центр в средиземноморском мире, где хранились копии всех основных научных трудов того времени. Считается, что Евклид получил образование в Афинах, и его работы признавались исключительными даже до его смерти в 265 г. до н. э. Его влияние не ослабевало на протяжении столетий, и даже коллектив математиков 1930-х гг., известный как Бурбаки, пропагандируя радикальные изменения в математике, выбрал наиболее привлекающий внимание лозунг «Долой Евклида!»
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Фрагмент фрески «Афинская школа» работы Рафаэля. Художник изобразил Евклида с лицом архитектора Браманте и с циркулем в руке.
«Начала» состоят из 13 книг. Первые шесть посвящены элементарной геометрии, книги с седьмой по десятую — вопросам чисел, а с одиннадцатой по тринадцатую — стереометрии. Шестая книга содержит текст, с которого началась история золотого сечения:
«Разделить прямую линию в крайнем и среднем отношении значит разделить ее на два таких отрезка, чтобы отношение всей линии к большему отрезку равнялось отношению большего отрезка к меньшему».
Или, выражаясь более кратко: «Целое относится к большей части, как большая часть к меньшей». (Первый английский перевод работ Евклида был сделан в 1570 г. Генри Биллингсли, ставшим вскоре лорд-мэром Лондона.)
Крайнее и среднее отношение, которое прозвучало так ненавязчиво, что его нетрудно упустить из вида, является тем самым числом, которое впоследствии стало известно как золотое сечение и которому в 1509 г. Лука Пачоли посвятил целый трактат под названием «О божественной пропорции». Современное обозначение золотого сечения фи, Ф, появилось значительно позже, в начале XX века, когда американец Марк Барр предложил использовать первую букву имени Фидий, архитектора Парфенона в Афинах.
Теперь, когда мы рассказали историю золотого сечения и определили его как иррациональное число, мы можем наконец начать изучение его математических свойств. Прежде всего, посчитаем значение числа Ф.