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  2. e (mathematical constant) - Wikipedia

    en.wikipedia.org/wiki/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 .

  3. Euler's identity - Wikipedia

    en.wikipedia.org/wiki/Euler's_identity

    In mathematics, Euler's identity[note 1] (also known as Euler's equation) is the equality where. e {\displaystyle e} is Euler's number, the base of natural logarithms, i {\displaystyle i} is the imaginary unit, which by definition satisfies. i 2 = − 1 {\displaystyle i^ {2}=-1} , and.

  4. List of representations of e - Wikipedia

    en.wikipedia.org/wiki/List_of_representations_of_e

    The mathematical constant e can be represented in a variety of ways as a real number. Since e is an irrational number (see proof that e is irrational), it cannot be represented as the quotient of two integers, but it can be represented as a continued fraction. Using calculus, e may also be represented as an infinite series, infinite product, or ...

  5. Euler's constant - Wikipedia

    en.wikipedia.org/wiki/Euler's_constant

    If e γ is a rational number, then its denominator must be greater than 10 15000. [2] Continued fraction. The simple continued fraction expansion of Euler's ...

  6. Euler's formula - Wikipedia

    en.wikipedia.org/wiki/Euler's_formula

    v. t. e. Euler's formula, named after Leonhard Euler, is a mathematical formula in complex analysis that establishes the fundamental relationship between the trigonometric functions and the complex exponential function. Euler's formula states that, for any real number x, one has where e is the base of the natural logarithm, i is the imaginary ...

  7. Scientific notation - Wikipedia

    en.wikipedia.org/wiki/Scientific_notation

    The same number, however, would be used if the last two digits were also measured precisely and found to equal 0 – seven significant figures. When a number is converted into normalized scientific notation, it is scaled down to a number between 1 and 10. All of the significant digits remain, but the placeholding zeroes are no longer required.

  8. Proof that e is irrational - Wikipedia

    en.wikipedia.org/wiki/Proof_that_e_is_irrational

    Euler's proof. Euler wrote the first proof of the fact that e is irrational in 1737 (but the text was only published seven years later). [1][2][3] He computed the representation of e as a simple continued fraction, which is. Since this continued fraction is infinite and every rational number has a terminating continued fraction, e is irrational.

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