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  2. Introductio in analysin infinitorum - Wikipedia

    en.wikipedia.org/wiki/Introductio_in_analysin...

    Euler's number e corresponds to shaded area equal to 1, introduced in chapter VII Introductio in analysin infinitorum ( Latin : [ 1 ] Introduction to the Analysis of the Infinite ) is a two-volume work by Leonhard Euler which lays the foundations of mathematical analysis .

  3. 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 .

  4. Euler's identity - Wikipedia

    en.wikipedia.org/wiki/Euler's_identity

    Euler's identity is a special case of Euler's formula, which states that for any real number x, e i x = cos ⁡ x + i sin ⁡ x {\displaystyle e^{ix}=\cos x+i\sin x} where the inputs of the trigonometric functions sine and cosine are given in radians .

  5. Proof that e is irrational - Wikipedia

    en.wikipedia.org/wiki/Proof_that_e_is_irrational

    From this contradiction we deduce that e is irrational. Now for the details. If e is a rational number, there exist positive integers a and b such that e = ⁠ a / b ⁠. Define the number =! (=!). Use the assumption that e = ⁠ a / b ⁠ to obtain =! (=!

  6. Hooley's delta function - Wikipedia

    en.wikipedia.org/wiki/Hooley's_delta_function

    In mathematics, Hooley's delta function (()), also called Erdős--Hooley delta-function, defines the maximum number of divisors of in [,] for all , where is the Euler's number. The first few terms of this sequence are

  7. From Zero to Infinity - Wikipedia

    en.wikipedia.org/wiki/From_Zero_to_Infinity

    The twelve chapters of From Zero to Infinity are numbered by the ten decimal digits, (Euler's number, approximately 2.71828), and , the smallest infinite cardinal number. Each chapter's topic is in some way related to its chapter number, with a generally increasing level of sophistication as the book progresses: [ 4 ] [ 5 ] [ 10 ]

  8. Mathematical constant - Wikipedia

    en.wikipedia.org/wiki/Mathematical_constant

    The circumference of a circle with diameter 1 is π.. A mathematical constant is a number whose value is fixed by an unambiguous definition, often referred to by a special symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

  9. Euler's formula - Wikipedia

    en.wikipedia.org/wiki/Euler's_formula

    Euler's formula is ubiquitous in mathematics, physics, chemistry, and engineering. The physicist Richard Feynman called the equation "our jewel" and "the most remarkable formula in mathematics". [2] When x = π, Euler's formula may be rewritten as e iπ + 1 = 0 or e iπ = −1, which is known as Euler's identity.