In mathematics, a quasiconvex function is a real-valued function defined on a convex subset of a real vector space, such that for any real number y, the set of points on which the function value is at most y is a convex set. In other words, the inverse image of any set of the form ( − ∞ , y ) {\displaystyle (-\infty ,y)} is a convex set.
In mathematics, a quasiconvex function is a real-valued function defined on a convex subset of a real vector space, such that for any real number y, the set of points on which the function value is at most y is a convex set. In other words, the inverse image of any set of the form ( − ∞ , y ) {\displaystyle (-\infty ,y)} is a convex set.
Source: Wikipedia "Quasiconvex function" · CC BY-SA 4.0
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