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  2. Eigenfunction - Wikipedia

    en.wikipedia.org/wiki/Eigenfunction

    As shown in an earlier example, the solution of Equation is the exponential = /. Equation is the time-independent Schrödinger equation. The eigenfunctions φ k of the Hamiltonian operator are stationary states of the quantum mechanical system, each with a corresponding energy E k. They represent allowable energy states of the system and may be ...

  3. Particle in a ring - Wikipedia

    en.wikipedia.org/wiki/Particle_in_a_ring

    The azimuthal wave functions in that case are identical to the energy eigenfunctions of the particle on a ring. The statement that any wavefunction for the particle on a ring can be written as a superposition of energy eigenfunctions is exactly identical to the Fourier theorem about the development of any periodic function in a Fourier series.

  4. Helmholtz equation - Wikipedia

    en.wikipedia.org/wiki/Helmholtz_equation

    The Helmholtz equation has a variety of applications in physics and other sciences, including the wave equation, the diffusion equation, and the Schrödinger equation for a free particle. In optics, the Helmholtz equation is the wave equation for the electric field. [1] The equation is named after Hermann von Helmholtz, who studied it in 1860. [2]

  5. Fredholm integral equation - Wikipedia

    en.wikipedia.org/wiki/Fredholm_integral_equation

    and the problem is, given the continuous kernel function and the function , to find the function .. An important case of these types of equation is the case when the kernel is a function only of the difference of its arguments, namely (,) = (), and the limits of integration are ±∞, then the right hand side of the equation can be rewritten as a convolution of the functions and and therefore ...

  6. Stationary state - Wikipedia

    en.wikipedia.org/wiki/Stationary_state

    A harmonic oscillator in classical mechanics (A–B) and quantum mechanics (C–H). In (A–B), a ball, attached to a spring, oscillates back and forth.(C–H) are six solutions to the Schrödinger equation for this situation.

  7. Position operator - Wikipedia

    en.wikipedia.org/wiki/Position_operator

    We write the eigenvalue equation in position coordinates, ^ = = recalling that ^ simply multiplies the wave-functions by the function , in the position representation. Since the function x {\displaystyle \mathrm {x} } is variable while x 0 {\displaystyle x_{0}} is a constant, ψ {\displaystyle \psi } must be zero everywhere except at the point ...

  8. Spectral theory of ordinary differential equations - Wikipedia

    en.wikipedia.org/wiki/Spectral_theory_of...

    The minimax principle follows because if = (,) (,), then λ(G) = λ k for the linear span of the first k − 1 eigenfunctions. For any other (k − 1)-dimensional subspace G, some f in the linear span of the first k eigenvectors must be orthogonal to G.

  9. Prolate spheroidal wave function - Wikipedia

    en.wikipedia.org/wiki/Prolate_spheroidal_wave...

    In mathematics, prolate spheroidal wave functions are eigenfunctions of the Laplacian in prolate spheroidal coordinates, adapted to boundary conditions on certain ellipsoids of revolution (an ellipse rotated around its long axis, “cigar shape“). Related are the oblate spheroidal wave functions (“pancake shaped” ellipsoid). [1]

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