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  2. Harmonic series (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Harmonic_series_(mathematics)

    Calculus. In mathematics, the harmonic series is the infinite series formed by summing all positive unit fractions: The first terms of the series sum to approximately , where is the natural logarithm and is the Euler–Mascheroni constant. Because the logarithm has arbitrarily large values, the harmonic series does not have a finite limit: it ...

  3. Zhang Qiujian Suanjing - Wikipedia

    en.wikipedia.org/wiki/Zhang_Qiujian_Suanjing

    Here is an example: "Now there is a pit [in the shape of the frustum of a pyramid] with a rectangular base. The width of the upper [rectangle] is 4 chi and the width of the lower [rectangle] is 7 chi. The length of the upper [rectangle] is 5 chi and the length of the lower [rectangle] is 8 chi. The depth is 1 zhang. Find the amount of millet ...

  4. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    A golden rectangle with long side a + b and short side a can be divided into two pieces: a similar golden rectangle (shaded red, right) with long side a and short side b and a square (shaded blue, left) with sides of length a. This illustrates the relationship ⁠ a + b / a ⁠ = ⁠ a / b ⁠ = φ.

  5. Runge–Kutta methods - Wikipedia

    en.wikipedia.org/wiki/Runge–Kutta_methods

    In numerical analysis, the Runge–Kutta methods (English: / ˈrʊŋəˈkʊtɑː / ⓘ RUUNG-ə-KUUT-tah[1]) are a family of implicit and explicit iterative methods, which include the Euler method, used in temporal discretization for the approximate solutions of simultaneous nonlinear equations. [2]

  6. Rectangular function - Wikipedia

    en.wikipedia.org/wiki/Rectangular_function

    The rectangular function (also known as the rectangle function, rect function, Pi function, Heaviside Pi function, [1] gate function, unit pulse, or the normalized boxcar function) is defined as [2] Alternative definitions of the function define to be 0, [3] 1, [4][5] or undefined. Its periodic version is called a rectangular wave.

  7. Packing problems - Wikipedia

    en.wikipedia.org/wiki/Packing_problems

    The study of polyomino tilings largely concerns two classes of problems: to tile a rectangle with congruent tiles, and to pack one of each n-omino into a rectangle. A classic puzzle of the second kind is to arrange all twelve pentominoes into rectangles sized 3×20, 4×15, 5×12 or 6×10.

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