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  2. Proof that π is irrational - Wikipedia

    en.wikipedia.org/wiki/Proof_that_π_is_irrational

    In the 1760s, Johann Heinrich Lambert was the first to prove that the number π is irrational, meaning it cannot be expressed as a fraction /, where and are both integers. ...

  3. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The number π (/ p aɪ / ⓘ; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.

  4. List of Lambda Pi Eta chapters - Wikipedia

    en.wikipedia.org/wiki/List_of_Lambda_Pi_Eta_chapters

    Lambda Pi Eta is an international communication studies honor society, associated with the National Communication Association. [1] Lambda Pi Eta was established in 1984 at the University of Arkansas and has more than 500 active chapters.

  5. Unit in the last place - Wikipedia

    en.wikipedia.org/wiki/Unit_in_the_last_place

    Here we start with 0 in single precision (binary32) and repeatedly add 1 until the operation does not change the value. Since the significand for a single-precision number contains 24 bits, the first integer that is not exactly representable is 2 24 +1, and this value rounds to 2 24 in round to nearest, ties to even.

  6. Magic number (programming) - Wikipedia

    en.wikipedia.org/wiki/Magic_number_(programming)

    the use of simple arithmetic constants, e.g., in expressions such as circumference = 2 * Math.PI * radius, [1] or for calculating the discriminant of a quadratic equation as d = b^2 − 4*a*c; the use of powers of 10 to convert metric values (e.g. between grams and kilograms) or to calculate percentage and per mille values

  7. Decimal representation - Wikipedia

    en.wikipedia.org/wiki/Decimal_representation

    Any real number can be approximated to any desired degree of accuracy by rational numbers with finite decimal representations.. Assume .Then for every integer there is a finite decimal =. such that:

  8. Anger function - Wikipedia

    en.wikipedia.org/wiki/Anger_function

    The Anger and Weber functions are related by Plot of the Weber function E v(z) with n=2 in the complex plane from -2-2i to 2+2i with colors created with Mathematica 13.1 function ComplexPlot3D ⁡ () = ⁡ () (), ⁡ () = ⁡ () (),

  9. List of Phi Gamma Nu chapters - Wikipedia

    en.wikipedia.org/wiki/List_of_Phi_Gamma_Nu_chapters

    Gamma Nu: 1980–xxxx ? George Mason University: Fairfax, Virginia: Inactive Gamma Xi: 1979 Indiana University of Pennsylvania: Indiana County, Pennsylvania: Active Gamma Omicron: 1979–xxxx ? Spelman College: Atlanta, Georgia: Inactive Gamma Pi: 1979–xxxx ? Arizona State University: Tempe, Arizona: Inactive Gamma Rho: 1979–xxxx ? Stephens ...