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  2. List of common physics notations - Wikipedia

    en.wikipedia.org/wiki/List_of_common_physics...

    newton meter squared per kilogram squared (N⋅m 2 /kg 2) shear modulus: pascal (Pa) or newton per square meter (N/m 2) gluon field strength tensor: inverse length squared (1/m 2) acceleration due to gravity: meters per second squared (m/s 2), or equivalently, newtons per kilogram (N/kg) magnetic field strength

  3. Scattering amplitude - Wikipedia

    en.wikipedia.org/wiki/Scattering_amplitude

    In the partial wave expansion the scattering amplitude is represented as a sum over the partial waves, [3] = = (+) (⁡), where f ℓ is the partial scattering amplitude and P ℓ are the Legendre polynomials.

  4. Divisor summatory function - Wikipedia

    en.wikipedia.org/wiki/Divisor_summatory_function

    Thus, for k = 2, D(x) = D 2 (x) counts the number of points on a square lattice bounded on the left by the vertical-axis, on the bottom by the horizontal-axis, and to the upper-right by the hyperbola jk = x. Roughly, this shape may be envisioned as a hyperbolic simplex.

  5. Gell-Mann–Okubo mass formula - Wikipedia

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

    where a 0, a 1, and a 2 are free parameters. The rule was first formulated by Murray Gell-Mann in 1961 [1] and independently proposed by Susumu Okubo in 1962. [2] [3] Isospin and hypercharge are generated by SU(3), which can be represented by eight hermitian and traceless matrices corresponding to the "components" of isospin and hypercharge ...

  6. Galois group - Wikipedia

    en.wikipedia.org/wiki/Galois_group

    For example, the field extensions () / for a square-free element each have a unique degree automorphism, inducing an automorphism in ⁡ (/). One of the most studied classes of infinite Galois group is the absolute Galois group , which is an infinite, profinite group defined as the inverse limit of all finite Galois extensions E / F ...

  7. Sigma model - Wikipedia

    en.wikipedia.org/wiki/Sigma_model

    Unfortunately, the "sigma meson" is not described by the sigma-model, but only a component of it. [1] The sigma model was introduced by Gell-Mann & Lévy (1960, section 5); the name σ-model comes from a field in their model corresponding to a spinless meson called σ, a scalar meson introduced earlier by Julian Schwinger. [2]

  8. Differential entropy - Wikipedia

    en.wikipedia.org/wiki/Differential_entropy

    In terms of measure theory, the differential entropy of a probability measure is the negative relative entropy from that measure to the Lebesgue measure, where the latter is treated as if it were a probability measure, despite being unnormalized.