Secular equation

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Secular equation has several meanings.

In mathematics and numerical analysis, it means characteristic equation. See also characteristic polynomial.

Speaking of the other usage in numerical analysis, it is an extension of characteristic equation. See also secular function.

In astronomy, it is the algebraic or numerical expression of the magnitude of the inequalities in a planet's motion that remain after the inequalities of a short period have been allowed for.[1]

In molecular orbital calculations relating to the energy of the electron and its wave function, it is also used instead of the characteristic equation.

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