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E (mathematical constant)

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E (mathematical constant)

The number e is a mathematical constant, approximately equal to 2.71828, that is the base of the natural logarithm and exponential function. It is sometimes called Euler's number, after the Swiss mathematician Leonhard Euler, though this can invite confusion with Euler numbers, or with Euler's constant, a different constant typically denoted γ {\displaystyle \gamma } . Alternatively, e can be called Napier's constant after John Napier. The Swiss mathematician Jacob Bernoulli discovered the constant while studying compound interest. The number e is of great importance in mathematics, alongside 0, 1, π, and i. All five appear in one formulation of Euler's identity e i π + 1 = 0 {\displaystyle e^{i\pi }+1=0} and play important and recurring roles across mathematics. Like the constant π, e is irrational, meaning that it cannot be represented as a ratio of integers. Moreover, it is transcendental, meaning that it is not a root of any non-zero polynomial with rational coefficients. To 30 decimal places, the value of e is:

Infobox

Type
Transcendental
Discovered
1685
By
Jacob Bernoulli
First mention
Quæstiones nonnullæ de usuris, cum solutione problematis de sorte alearum, propositi in Ephem. Gall. A. 1685
Named after
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Tables

Number of known decimal digits of e · Representations › Known digits
1690
1690
Date
1690
Decimal digits
1
Computation performed by
Jacob Bernoulli
1714
1714
Date
1714
Decimal digits
13
Computation performed by
Roger Cotes
1748
1748
Date
1748
Decimal digits
23
Computation performed by
Leonhard Euler
1853
1853
Date
1853
Decimal digits
137
Computation performed by
William Shanks
1871
1871
Date
1871
Decimal digits
205
Computation performed by
William Shanks
1884
1884
Date
1884
Decimal digits
346
Computation performed by
J. Marcus Boorman
1949
1949
Date
1949
Decimal digits
2,010
Computation performed by
John von Neumann (on the ENIAC)
1961
1961
Date
1961
Decimal digits
100,265
Computation performed by
Daniel Shanks and John Wrench
1978
1978
Date
1978
Decimal digits
116,000
Computation performed by
Steve Wozniak on the Apple II
Date
Decimal digits
Computation performed by
1690
1
Jacob Bernoulli
1714
13
Roger Cotes
1748
23
Leonhard Euler
1853
137
William Shanks
1871
205
William Shanks
1884
346
J. Marcus Boorman
1949
2,010
John von Neumann (on the ENIAC)
1961
100,265
Daniel Shanks and John Wrench
1978
116,000
Steve Wozniak on the Apple II

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