generalized Hill-Mathieu equation

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Floquet theory — is a branch of the theory of ordinary differential equations relating to the class of solutions to linear differential equations of the form, :dot{x} = A(t) x,,with displaystyle A(t) a continuous periodic function with period T. The main theorem… … Wikipedia
literature — /lit euhr euh cheuhr, choor , li treuh /, n. 1. writings in which expression and form, in connection with ideas of permanent and universal interest, are characteristic or essential features, as poetry, novels, history, biography, and essays. 2.… … Universalium
Lorentz group — Group theory Group theory … Wikipedia

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