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  2. Extension (telephone) - Wikipedia

    en.wikipedia.org/wiki/Extension_(telephone)

    In business telephony, a telephone extension may refer to a phone on an internal telephone line attached to a private branch exchange (PBX) or Centrex system. The PBX operates much as a community switchboard does for a geographic telephone numbering plan and allows multiple lines inside the office to connect without each phone requiring a ...

  3. Telephone number (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Telephone_number_(mathematics)

    The general solution to this differential equation is G(x) ∝ exp(x + x 2 /2), and T(0) = 1 shows that the constant of proportionality is 1. This function is closely related to the exponential generating function of the Hermite polynomials , which are the matching polynomials of the complete graphs. [ 13 ]

  4. 1/2 + 1/4 + 1/8 + 1/16 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1/2_%2B_1/4_%2B_1/8_%2B_1/...

    In mathematics, the infinite series ⁠ 1 / 2 ⁠ + ⁠ 1 / 4 ⁠ + ⁠ 1 / 8 ⁠ + ⁠ 1 / 16 ⁠ + ··· is an elementary example of a geometric series that converges absolutely. The sum of the series is 1.

  5. Help:Displaying a formula - Wikipedia

    en.wikipedia.org/wiki/Help:Displaying_a_formula

    7.1 1 step method. 7.2 3 step method. 7.2. ... _ 1 ^ 2 \!\Omega _ 3 ^ 4 ... As seen in equation ({{EquationNote|1}}), example text... The result looks like this:

  6. Basic Rate Interface - Wikipedia

    en.wikipedia.org/wiki/Basic_Rate_Interface

    The I.430 protocol defines 48-bit packets comprising 16 bits from the B1 channel, 16 bits from B2 channel, 4 bits from the D channel, and 12 bits used for synchronization purposes. These packets are sent at a rate of 4 kHz , resulting in a gross bit rate of 192 kbit/s and – giving the data rates listed above – a maximum possible throughput ...

  7. Step function - Wikipedia

    en.wikipedia.org/wiki/Step_function

    The sign function sgn(x), which is −1 for negative numbers and +1 for positive numbers, and is the simplest non-constant step function. The Heaviside function H ( x ) , which is 0 for negative numbers and 1 for positive numbers, is equivalent to the sign function, up to a shift and scale of range ( H = ( sgn + 1 ) / 2 {\displaystyle H ...

  8. Phone etiquette 101: When it’s rude to be on speaker — and ...

    www.aol.com/news/phone-etiquette-101-rude...

    Turn your phone off for important conversations and moments. You want to be present for these moments. If you’re using your phone as a camera, at least put it in airplane or Do Not Disturb mode.

  9. One-step method - Wikipedia

    en.wikipedia.org/wiki/One-step_method

    The Matlab function ode45 implements a one-step method that uses two embedded explicit Runge-Kutta methods with convergence orders 4 and 5 for step size control. [ 29 ] The solution can now be plotted, y 1 {\displaystyle y_{1}} as a blue curve and y 2 {\displaystyle y_{2}} as a red curve; the calculated points are marked by small circles: