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  2. Quartic equation - Wikipedia

    en.wikipedia.org/wiki/Quartic_equation

    This means that has a real root greater than , and therefore that has a real root greater than . Using this root the term a + 2 y {\displaystyle {\sqrt {a+2y}}} in ( 8 ) is always real, which ensures that the two quadratic equations ( 8 ) have real coefficients.

  3. Hurwitz quaternion - Wikipedia

    en.wikipedia.org/wiki/Hurwitz_quaternion

    What Adolf Hurwitz realised, therefore, was that this definition of Hurwitz integral quaternion is the better one to operate with. For a non-commutative ring such as H , maximal orders need not be unique, so one needs to fix a maximal order, in carrying over the concept of an algebraic integer .

  4. AOL Mail for Verizon Customers - AOL Help

    help.aol.com/products/aol-mail-verizon

    AOL Mail welcomes Verizon customers to our safe and delightful email experience!

  5. Code page - Wikipedia

    en.wikipedia.org/wiki/Code_page

    An unregistered private code page not based on an existing code page, a device specific code page like a printer font, which just needs a logical handle to become addressable for the system, a frequently changing download font, or a code page number with a symbolic meaning in the local environment could have an assignment in the private range ...

  6. Pythagorean means - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_means

    The study of the Pythagorean means is closely related to the study of majorization and Schur-convex functions. The harmonic and geometric means are concave symmetric functions of their arguments, and hence Schur-concave, while the arithmetic mean is a linear function of its arguments and hence is both concave and convex.

  7. Metallic mean - Wikipedia

    en.wikipedia.org/wiki/Metallic_mean

    Since the inverse of a metallic mean is less than 1, this formula implies that the quotient of two consecutive elements of such a sequence tends to the metallic mean, when k tends to the infinity. For example, if n = 1 , {\displaystyle n=1,} S n {\displaystyle S_{n}} is the golden ratio .

  8. Moving average - Wikipedia

    en.wikipedia.org/wiki/Moving_average

    Smoothing of a noisy sine (blue curve) with a moving average (red curve). In statistics, a moving average (rolling average or running average or moving mean [1] or rolling mean) is a calculation to analyze data points by creating a series of averages of different selections of the full data set.

  9. Interquartile mean - Wikipedia

    en.wikipedia.org/wiki/Interquartile_mean

    The interquartile mean (IQM) (or midmean) is a statistical measure of central tendency based on the truncated mean of the interquartile range.The IQM is very similar to the scoring method used in sports that are evaluated by a panel of judges: discard the lowest and the highest scores; calculate the mean value of the remaining scores.