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  2. Maximum coverage problem - Wikipedia

    en.wikipedia.org/wiki/Maximum_coverage_problem

    The maximum coverage problem is a classical question in computer science, computational complexity theory, and operations research . It is a problem that is widely taught in approximation algorithms . As input you are given several sets and a number . The sets may have some elements in common. You must select at most of these sets such that the ...

  3. Coin problem - Wikipedia

    en.wikipedia.org/wiki/Coin_problem

    As 2 points are awarded for safeties from regular play, and 3 points are awarded for field goals, all scores other than 1–0, 11, 2–1, 3–1, 4–1, 5–1 and 7–1 are possible. Applications. Shellsort Time Complexity. The Shellsort algorithm is a sorting algorithm whose time complexity is currently an open problem. The worst case ...

  4. Superpermutation - Wikipedia

    en.wikipedia.org/wiki/Superpermutation

    Superpermutation. In combinatorial mathematics, a superpermutation on n symbols is a string that contains each permutation of n symbols as a substring. While trivial superpermutations can simply be made up of every permutation concatenated together, superpermutations can also be shorter (except for the trivial case of n = 1) because overlap is ...

  5. Grandi's series - Wikipedia

    en.wikipedia.org/wiki/Grandi's_series

    Grandi's series. In mathematics, the infinite series 11 + 11 + ⋯, also written. is sometimes called Grandi's series, after Italian mathematician, philosopher, and priest Guido Grandi, who gave a memorable treatment of the series in 1703. It is a divergent series, meaning that it does not have a sum. However, it can be manipulated to ...

  6. Geometric series - Wikipedia

    en.wikipedia.org/wiki/Geometric_series

    The convergence of the geometric series with r=1/2 and a=1/2 The convergence of the geometric series with r=1/2 and a=1 Close-up view of the cumulative sum of functions within the range -1 < r < -0.5 as the first 11 terms of the geometric series 1 + r + r 2 + r 3 + ... are added. The geometric series 1 / (1 - r) is the red dashed line.

  7. e (mathematical constant) - Wikipedia

    en.wikipedia.org/wiki/E_(mathematical_constant)

    The number e is a mathematical constant approximately equal to 2.71828 that can be characterized in many ways. It is the base of the natural logarithm function. It is the limit of as n tends to infinity, an expression that arises in the computation of compound interest. It is the value at 1 of the (natural) exponential function, commonly ...

  8. Buffon's needle problem - Wikipedia

    en.wikipedia.org/wiki/Buffon's_needle_problem

    Buffon's needle problem. The a needle lies across a line, while the b needle does not. In probability theory, Buffon's needle problem is a question first posed in the 18th century by Georges-Louis Leclerc, Comte de Buffon: [1] Suppose we have a floor made of parallel strips of wood, each the same width, and we drop a needle onto the floor.

  9. ISO 3166-1 alpha-2 - Wikipedia

    en.wikipedia.org/wiki/ISO_3166-1_alpha-2

    ISO 3166-1 alpha-2 codes are two-letter country codes defined in ISO 3166-1, part of the ISO 3166 standard [1] published by the International Organization for Standardization (ISO), to represent countries, dependent territories, and special areas of geographical interest. They are the most widely used of the country codes published by ISO (the ...