What does AQE stand for?

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I have seen the acronym AQE in mathematics books in relation to the characteristic equation used in solving second-order homogeneous ordinary differential equation. Although I am not sure what the acronym stands for and I haven't found anywhere on the internet or in the books.

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I've never seen it before, but Google turns up "auxiliary quadratic equation".

According to Wikipedia, "auxiliary equation" is synonymous with "characteristic equation".

According to this, an "auxiliary quadratic equation" is a characteristic equation of degree two.

(I dislike this acronym, as "q" is the first letter of "quartic" and "quintic" as well.)