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List of representations of e : ウィキペディア英語版 | List of representations of e
The mathematical constant can be represented in a variety of ways as a real number. Since is an irrational number (see proof that e is irrational), it cannot be represented as a fraction, but it can be represented as a continued fraction. Using calculus, may also be represented as an infinite series, infinite product, or other sort of limit of a sequence. ==As a continued fraction==
Euler proved that the number is represented as the infinite simple continued fraction : : Its convergence can be tripled by allowing just one fractional number: : Here are some infinite generalized continued fraction expansions of . The second is generated from the first by a simple equivalence transformation. : : This last, equivalent to (0.5, 12, 5, 28, 9, ... ), is a special case of a general formula for the exponential function: :
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