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List of representations of e
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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 :
:e = (1, \textbf, 1, 1, \textbf, 1, 1, \textbf, 1, 1, \textbf, 1, 1, \ldots, \textbf, 1, 1, \ldots ). \,
Its convergence can be tripled by allowing just one fractional number:
: e = (1 ; \textbf , 12 , 5 , 28 , 9 , 44 , 13 , 60 , 17 , \ldots , \textbf , \textbf , \ldots ). \,
Here are some infinite generalized continued fraction expansions of . The second is generated from the first by a simple equivalence transformation.
:
e= 2+\cfrac}}}} = 2+\cfrac}}}}

:e = 2+\cfrac}}}} = 1+\cfrac}}}}
This last, equivalent to (0.5, 12, 5, 28, 9, ... ), is a special case of a general formula for the exponential function:
:e^ = 1+\cfrac }}}}

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