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  2. Finite volume method for two dimensional diffusion problem

    en.wikipedia.org/wiki/Finite_volume_method_for...

    Graph of 2 dimensional plot. In addition to the east (E) and west (W) neighbors, a general grid node P, now also has north (N) and south (S) neighbors. The same notation is used here for all faces and cell dimensions as in one dimensional analysis. When the above equation is formally integrated over the Control volume, we obtain

  3. List of nonlinear ordinary differential equations - Wikipedia

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

    Differential equations are prominent in many scientific areas. Nonlinear ones are of particular interest for their commonality in describing real-world systems and how much more difficult they are to solve compared to linear differential equations.

  4. Exponential response formula - Wikipedia

    en.wikipedia.org/wiki/Exponential_response_formula

    In mathematics, the exponential response formula (ERF), also known as exponential response and complex replacement, is a method used to find a particular solution of a non-homogeneous linear ordinary differential equation of any order. [1] [2] The exponential response formula is applicable to non-homogeneous linear ordinary differential ...

  5. List of nonlinear partial differential equations - Wikipedia

    en.wikipedia.org/wiki/List_of_nonlinear_partial...

    Name Dim Equation Applications Landau–Lifshitz model: 1+n = + Magnetic field in solids Lin–Tsien equation: 1+2 + = Liouville equation: any + = Liouville–Bratu–Gelfand equation

  6. Laguerre polynomials - Wikipedia

    en.wikipedia.org/wiki/Laguerre_polynomials

    Complex color plot of the Laguerre polynomial L n(x) with n as -1 divided by 9 and x as z to the power of 4 from -2-2i to 2+2i. In mathematics, the Laguerre polynomials, named after Edmond Laguerre (1834–1886), are nontrivial solutions of Laguerre's differential equation: ″ + ′ + =, = which is a second-order linear differential equation.

  7. Paschen's law - Wikipedia

    en.wikipedia.org/wiki/Paschen's_law

    Paschen's law is an equation that gives the breakdown voltage, that is, the voltage necessary to start a discharge or electric arc, between two electrodes in a gas as a function of pressure and gap length. [2] [3] It is named after Friedrich Paschen who discovered it empirically in 1889. [4]

  8. Pseudo Jahn–Teller effect - Wikipedia

    en.wikipedia.org/wiki/Pseudo_Jahn–Teller_effect

    An interesting typical situation of hidden PJTE emerges in molecular and solid-state systems with valence half-filed closed shells electronic configurations e 2 and t 3. For instance, in the e 2 case the ground state in the high-symmetry equilibrium geometry is an orbital non-degenerate triplet 3 A, while the nearby low-lying two excited ...

  9. List of linear ordinary differential equations - Wikipedia

    en.wikipedia.org/wiki/List_of_linear_ordinary...

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