- 自然常数 - 百度百科
自然常数，符号e，为数学中一个常数，是一个无限不循环小数，且为超越数，其值约为2 718281828459045。 它是自然对数函数的底数。 有时称它为欧拉数（Euler number），以瑞士数学家欧拉命名；也有个较鲜见的名字——纳皮尔常数，以纪念苏格兰数学家约翰·纳皮尔
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- E - Wikipedia
E, or e, is the fifth letter and the second vowel letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide Its name in English is e (pronounced ˈ iː ⓘ ); plural es , Es , or E's
- E (数学常数) - 维基百科，自由的百科全书
Google也是首先在矽谷心臟地帶，接著在麻薩諸塞州劍橋出現的神祕廣告版 的幕後黑手，它寫著{first 10-digit prime found in consecutive digits of e} com（在 的連續數字中第一個發現的十位質數 com）。
- e (Eulers Number) - Math is Fun
e is an irrational number (it cannot be written as a simple fraction) e is the base of the Natural Logarithms (invented by John Napier) e is found in many interesting areas, so is worth learning about
- e （欧拉数） - 数学乐
e 是自然对数的底（由约翰·纳皮尔发明）。 e 出现在很多数学领域里，所以了解它是很有用的。 计算 有很多计算 e 的值的方法，但没有方法可以算出绝对精确的值，因为 e 是个无理数（不是两个整数的比）。 但我们知道它精确到一万亿个小数位的值！
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