Definition: In mathematics, "brank" refers to a special case of a function that is used in the context of mathematical optimization. Specifically, it's a type of function known as a nonlinear function or an optimization function. An optimization function is a function that attempts to find the value(s) of a variable (often called a parameter) that minimizes or maximizes some objective function over a given set of feasible points (also known as decision variables). The term "brank" refers to this concept
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