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  2. 68–95–99.7 rule - Wikipedia

    en.wikipedia.org/wiki/68–95–99.7_rule

    In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3sr or 3 σ, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: approximately 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean ...

  3. Berry–Esseen theorem - Wikipedia

    en.wikipedia.org/wiki/Berry–Esseen_theorem

    Calculated upper bounds on the constant C have decreased markedly over the years, from the original value of 7.59 by Esseen in 1942. [1] The estimate C < 0.4748 follows from the inequality sup x ∈ R | F n ( x ) − Φ ( x ) | ≤ 0.33554 ( ρ + 0.415 σ 3 ) σ 3 n , {\displaystyle \sup _{x\in \mathbb {R} }\left|F_{n}(x)-\Phi (x)\right|\leq {0 ...

  4. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    3.6.3.2 Golden triangle and ... ⁠ and is an irrational number with a value of [1] ... The consistently small terms in its continued fraction explain why the ...

  5. Riemann zeta function - Wikipedia

    en.wikipedia.org/wiki/Riemann_zeta_function

    The Riemann zeta function ζ(z) plotted with domain coloring. [1] The pole at = and two zeros on the critical line.. The Riemann zeta function or Euler–Riemann zeta function, denoted by the Greek letter ζ (), is a mathematical function of a complex variable defined as () = = = + + + for ⁡ >, and its analytic continuation elsewhere.

  6. Logarithm - Wikipedia

    en.wikipedia.org/wiki/Logarithm

    The graph of the logarithm base 2 crosses the x-axis at x = 1 and passes through the points (2, 1), (4, 2), and (8, 3), depicting, e.g., log 2 (8) = 3 and 2 3 = 8. The graph gets arbitrarily close to the y-axis, but does not meet it. Addition, multiplication, and exponentiation are three of the most fundamental arithmetic operations.

  7. Glossary of string theory - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_string_theory

    3. Dirac matrix 4. Width of some scattering process δ 1. Kronecker delta function 2. An infinitesimal change in something; for example δL is an infinitesimal change in L Δ 1. Propagator 2. Delta baryon, a baryon with 3 light quarks and isospin 3/2 3. Laplace operator in Euclidean space or more generally a Riemannian manifold ε 1.

  8. Pulse-width modulation - Wikipedia

    en.wikipedia.org/wiki/Pulse-width_modulation

    When the counter value is more than the reference value, the PWM output changes state from high to low (or low to high). [5] This technique is referred to as time proportioning, particularly as time-proportioning control [ 6 ] – which proportion of a fixed cycle time is spent in the high state.