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Darboux function
In mathematics, a Darboux function, named for Gaston Darboux (1842-1917), is a real-valued function f which has the "intermediate value property": on the interval between a and b, f assumes every real value between f(a) and f(b). Formally, for all real numbers a and b, and for every z such that f(a) < z < f(b),
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