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  2. Decimal separator - Wikipedia

    en.wikipedia.org/wiki/Decimal_separator

    [6] [2] [7] In some specialized contexts, the word decimal is instead used for this purpose (such as in International Civil Aviation Organization-regulated air traffic control communications). In mathematics, the decimal separator is a type of radix point , a term that also applies to number systems with bases other than ten.

  3. Real number - Wikipedia

    en.wikipedia.org/wiki/Real_number

    The long real line pastes together ℵ 1 * + ℵ 1 copies of the real line plus a single point (here ℵ 1 * denotes the reversed ordering of ℵ 1) to create an ordered set that is "locally" identical to the real numbers, but somehow longer; for instance, there is an order-preserving embedding of ℵ 1 in the long real line but not in the real ...

  4. The Price Is Right - Wikipedia

    en.wikipedia.org/wiki/The_Price_Is_Right

    The Price Is Right is an American television game show where contestants compete by guessing the prices of merchandise to win cash and prizes. A 1972 revival by Mark Goodson and Bill Todman of their 1956–1965 show of the same name, the new version added many distinctive gameplay elements.

  5. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  6. Slash (punctuation) - Wikipedia

    en.wikipedia.org/wiki/Slash_(punctuation)

    The slash is a slanting line punctuation mark /.It is also known as a stroke, a solidus, a forward slash and several other historical or technical names.Once used as the equivalent of the modern period and comma, the slash is now used to represent division and fractions, as a date separator, or to connect alternative terms.

  7. Apollonius of Perga - Wikipedia

    en.wikipedia.org/wiki/Apollonius_of_Perga

    Vertical measurement is from a horizontal line he calls the “diameter.” The word is the same in Greek as it is in English, but the Greek is somewhat wider in its comprehension. [24] If the figure of the conic section is cut by a grid of parallel lines, the diameter bisects all the line segments included between the branches of the figure.

  8. Sicilian Mafia - Wikipedia

    en.wikipedia.org/wiki/Sicilian_Mafia

    The Sicilian Mafia or Cosa Nostra (Italian: [ˈkɔːza ˈnɔstra, ˈkɔːsa-], Sicilian: [ˈkɔːsa ˈnɔʂː(ɽ)a]; "our thing" [3]), also referred to as simply Mafia, is a criminal society and criminal organization originating on the island of Sicily and dates back to the mid-19th century.