Basis (universal algebra)
- This article is about the Hill differential equation; for the equation used in biochemistry see Hill equation (biochemistry)
In mathematics, the Hill equation or Hill differential equation is the second-order linear ordinary differential equation
where f(t) is a periodic function.[1] It is named after George William Hill, who introduced it in 1886.[2]
One can always assume that the period of f(t) equals 2π; then the Hill equation can be rewritten using the Fourier series of f(t):
Important special cases of Hill's equation include the Mathieu equation (in which only the terms corresponding to n = 0, 1 are included) and the Meissner equation.
Hill's equation is an important example in the understanding of periodic differential equations. Depending on the exact shape of f(t), solutions may stay bounded for all time, or the amplitude of the oscillations in solutions may grow exponentially.[3] The precise form of the solutions to Hill's equation is described by Floquet theory. Solutions can also be written in terms of Hill determinants.
Aside from its original application to lunar stability, the Hill equation appears in many settings including the modeling of a quadrupole mass spectrometer, as the one-dimensional Schrödinger equation of an electron in a crystal and in accelerator physics.
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