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  2. Beta function - Wikipedia

    en.wikipedia.org/wiki/Beta_function

    The Pascal-like identity above implies that this function is a solution to the first-order partial differential equation h = h a + h b . {\displaystyle h=h_{a}+h_{b}.} For x , y ≥ 1 {\displaystyle x,y\geq 1} , the beta function may be written in terms of a convolution involving the truncated power function t ↦ t + x {\displaystyle t\mapsto ...

  3. Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Excel

    In the figure, the fraction 1/9000 is displayed in Excel. Although this number has a decimal representation that is an infinite string of ones, Excel displays only the leading 15 figures. In the second line, the number one is added to the fraction, and again Excel displays only 15 figures. In the third line, one is subtracted from the sum using ...

  4. Ideal gas law - Wikipedia

    en.wikipedia.org/wiki/Ideal_gas_law

    Isotherms of an ideal gas for different temperatures. The curved lines are rectangular hyperbolae of the form y = a/x. They represent the relationship between pressure (on the vertical axis) and volume (on the horizontal axis) for an ideal gas at different temperatures: lines that are farther away from the origin (that is, lines that are nearer to the top right-hand corner of the diagram ...

  5. Pell's equation - Wikipedia

    en.wikipedia.org/wiki/Pell's_equation

    The relationship to the continued fractions implies that the solutions to Pell's equation form a semigroup subset of the modular group. Thus, for example, if p and q satisfy Pell's equation, then is a matrix of unit determinant. Products of such matrices take exactly the same form, and thus all such products yield solutions to Pell's equation.

  6. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    An example of the second case is the decidability of the first-order theory of the real numbers, a problem of pure mathematics that was proved true by Alfred Tarski, with an algorithm that is impossible to implement because of a computational complexity that is much too high. [122]

  7. Decimal separator - Wikipedia

    en.wikipedia.org/wiki/Decimal_separator

    For example, Wikipedia content can display numbers this way, as in the following examples: 149 597 870 700 metres is 1 astronomical unit 3.14159 26535 89793 23846 is π rounded to 20 decimal places 2.71828 18284 59045 23536 is e rounded to 20 decimal places.

  8. Boltzmann constant - Wikipedia

    en.wikipedia.org/wiki/Boltzmann_constant

    Boltzmann constant: The Boltzmann constant, k, is one of seven fixed constants defining the International System of Units, the SI, with k = 1.380 649 x 10-23 J K-1.The Boltzmann constant is a proportionality constant between the quantities temperature (with unit kelvin) and energy (with unit joule).

  9. Ternary plot - Wikipedia

    en.wikipedia.org/wiki/Ternary_plot

    The ratio of the measured lines then gives the component value as a fraction of 100%. A displacement along a parallel line (grid line) preserves the sum of two values, while motion along a perpendicular line increases (or decreases) the two values an equal amount, each half of the decrease (increase) of the third value.