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  2. Fine-structure constant - Wikipedia

    en.wikipedia.org/wiki/Fine-structure_constant

    A nondimensionalised system commonly used in high energy physics sets ε 0 = c = ħ = 1, where the expressions for the fine-structure constant becomes [10] =. As such, the fine-structure constant is just a quantity determining (or determined by) the elementary charge : e = √ 4 πα ≈ 0.302 822 12 in terms of such a natural unit of charge.

  3. Branching fraction - Wikipedia

    en.wikipedia.org/wiki/Branching_fraction

    In particle physics and nuclear physics, the branching fraction (or branching ratio) for a decay is the fraction of particles that decay by an individual decay mode or with respect to the total number of particles which decay. It applies to either the radioactive decay of atoms or the decay of elementary particles. [1]

  4. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    To change ⁠ 1 / 3 ⁠ to a decimal, divide 1.000... by 3 (" 3 into 1.000... "), and stop when the desired accuracy is obtained, e.g., at 4 decimals with 0.3333. The fraction1 / 4 ⁠ can be written exactly with two decimal digits, while the fraction1 / 3 ⁠ cannot be written exactly as a

  5. Unit fraction - Wikipedia

    en.wikipedia.org/wiki/Unit_fraction

    Slices of approximately 1/8 of a pizza. A unit fraction is a positive fraction with one as its numerator, 1/ n.It is the multiplicative inverse (reciprocal) of the denominator of the fraction, which must be a positive natural number.

  6. Partial fraction decomposition - Wikipedia

    en.wikipedia.org/wiki/Partial_fraction_decomposition

    In algebra, the partial fraction decomposition or partial fraction expansion of a rational fraction (that is, a fraction such that the numerator and the denominator are both polynomials) is an operation that consists of expressing the fraction as a sum of a polynomial (possibly zero) and one or several fractions with a simpler denominator. [1]

  7. Farey sequence - Wikipedia

    en.wikipedia.org/wiki/Farey_sequence

    With the restricted definition, each Farey sequence starts with the value 0, denoted by the fraction ⁠ 0 / 1 ⁠, and ends with the value 1, denoted by the fraction1 / 1 ⁠ (although some authors omit these terms). A Farey sequence is sometimes called a Farey series, which is not strictly correct, because the terms are not summed. [2]

  8. Mathematical formulation of the Standard Model - Wikipedia

    en.wikipedia.org/wiki/Mathematical_formulation...

    This article describes the mathematics of the Standard Model of particle physics, a gauge quantum field theory containing the internal symmetries of the unitary product group SU(3) × SU(2) × U(1). The theory is commonly viewed as describing the fundamental set of particles – the leptons , quarks , gauge bosons and the Higgs boson .

  9. Continued fraction - Wikipedia

    en.wikipedia.org/wiki/Continued_fraction

    where c 1 = ⁠ 1 / a 1 ⁠, c 2 = ⁠ a 1 / a 2 ⁠, c 3 = ⁠ a 2 / a 1 a 3 ⁠, and in general c n + 1 = ⁠ 1 / a n + 1 c n ⁠. Second, if none of the partial denominators b i are zero we can use a similar procedure to choose another sequence {d i} to make each partial denominator a 1:

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