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  2. Divisor summatory function - Wikipedia

    en.wikipedia.org/wiki/Divisor_summatory_function

    The summatory function, with leading terms removed, for < The summatory function, with leading terms removed, for < The summatory function, with leading terms removed, for <, graphed as a distribution or histogram. The vertical scale is not constant left to right; click on image for a detailed description.

  3. Gell-Mann–Okubo mass formula - Wikipedia

    en.wikipedia.org/wiki/Gell-Mann–Okubo_mass_formula

    The formula is underlain by the octet enhancement hypothesis, which ascribes dominance of SU(3) breaking to the hypercharge generator of SU(3), = = ⁡ (,,) / , and, in modern terms, the relatively higher mass of the strange quark. [4] [5]

  4. Sigma - Wikipedia

    en.wikipedia.org/wiki/Sigma

    In topology, σ-compact topological space is one that can be written as a countable union of compact subsets. [11] In mathematical analysis and in probability theory, there is a type of algebra of sets known as σ-algebra (aka σ-field). Sigma algebra also includes terms such as: σ(A), denoting the generated sigma-algebra of a set A

  5. De Finetti's theorem - Wikipedia

    en.wikipedia.org/wiki/De_Finetti's_theorem

    A random variable X has a Bernoulli distribution if Pr(X = 1) = p and Pr(X = 0) = 1 − p for some p ∈ (0, 1).. De Finetti's theorem states that the probability distribution of any infinite exchangeable sequence of Bernoulli random variables is a "mixture" of the probability distributions of independent and identically distributed sequences of Bernoulli random variables.

  6. Differential entropy - Wikipedia

    en.wikipedia.org/wiki/Differential_entropy

    One must take care in trying to apply properties of discrete entropy to differential entropy, since probability density functions can be greater than 1. For example, the uniform distribution U ( 0 , 1 / 2 ) {\displaystyle {\mathcal {U}}(0,1/2)} has negative differential entropy; i.e., it is better ordered than U ( 0 , 1 ) {\displaystyle ...

  7. Levi-Civita symbol - Wikipedia

    en.wikipedia.org/wiki/Levi-Civita_symbol

    In two dimensions, the Levi-Civita symbol is defined by: = {+ (,) = (,) (,) = (,) = The values can be arranged into a 2 × 2 antisymmetric matrix: = (). Use of the two-dimensional symbol is common in condensed matter, and in certain specialized high-energy topics like supersymmetry [1] and twistor theory, [2] where it appears in the context of 2-spinors.

  8. Kelvin equation - Wikipedia

    en.wikipedia.org/wiki/Kelvin_equation

    Let and be the volume occupied by one molecule in the liquid phase and vapor phase respectively. If the drop is considered to be spherical, then If the drop is considered to be spherical, then n x v l = 4 3 π r 3 . {\displaystyle n_{x}v_{l}={\frac {4}{3}}\pi r^{3}.}