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  2. Quantum number - Wikipedia

    en.wikipedia.org/wiki/Quantum_number

    The s subshell ( = 0) contains only one orbital, and therefore the m of an electron in an s orbital will always be 0. The p subshell ( = 1) contains three orbitals, so the m of an electron in a p orbital will be −1, 0, or 1. The d subshell ( = 2) contains five orbitals, with m values of −2, −1, 0, 1, and 2.

  3. List of electromagnetism equations - Wikipedia

    en.wikipedia.org/wiki/List_of_electromagnetism...

    Continuous charge distribution. The volume charge density ρ is the amount of charge per unit volume (cube), surface charge density σ is amount per unit surface area (circle) with outward unit normal n̂, d is the dipole moment between two point charges, the volume density of these is the polarization density P.

  4. Electron shell - Wikipedia

    en.wikipedia.org/wiki/Electron_shell

    In chemistry and atomic physics, an electron shell may be thought of as an orbit that electrons follow around an atom's nucleus.The closest shell to the nucleus is called the "1 shell" (also called the "K shell"), followed by the "2 shell" (or "L shell"), then the "3 shell" (or "M shell"), and so on further and further from the nucleus.

  5. Catalan's conjecture - Wikipedia

    en.wikipedia.org/wiki/Catalan's_conjecture

    The history of the problem dates back at least to Gersonides, who proved a special case of the conjecture in 1343 where (x, y) was restricted to be (2, 3) or (3, 2).The first significant progress after Catalan made his conjecture came in 1850 when Victor-Amédée Lebesgue dealt with the case b = 2.

  6. List of nonlinear ordinary differential equations - Wikipedia

    en.wikipedia.org/wiki/List_of_nonlinear_ordinary...

    Generalization of Clairaut's equation with a singular solution [8] Clairaut's equation: 1 = + Particular case of d'Alembert's equation which may be solved exactly [9] d'Alembert's equation or Lagrange's equation 1

  7. Mathematical descriptions of the electromagnetic field

    en.wikipedia.org/wiki/Mathematical_descriptions...

    But for the equations with source terms (Gauss's law and the Ampère-Maxwell equation), the Hodge dual of this 2-form is needed. The Hodge star operator takes a p-form to a (n − p)-form, where n is the number of dimensions. Here, it takes the 2-form (F) and gives another 2-form (in four dimensions, n − p = 4 − 2 = 2).

  8. Translation of axes - Wikipedia

    en.wikipedia.org/wiki/Translation_of_axes

    that is, eliminating the xy term. [6] Next, a translation of axes can reduce an equation of the form to an equation of the same form but with new variables (x', y') as coordinates, and with D and E both equal to zero (with certain exceptions—for example, parabolas). The principal tool in this process is "completing the square."

  9. List of equations in wave theory - Wikipedia

    en.wikipedia.org/wiki/List_of_equations_in_wave...

    m [L] (Oscillatory) velocity amplitude V, v 0, v m. Here v 0 is used. m s −1 [L][T] −1 (Oscillatory) acceleration amplitude A, a 0, a m. Here a 0 is used. m s −2 [L][T] −2: Spatial position Position of a point in space, not necessarily a point on the wave profile or any line of propagation d, r: m [L] Wave profile displacement