Definition: The term "variers" is used in mathematics to refer to a function of several variables. It can be thought of as a generalization or extension of functions that have been defined for just two variables, such as polynomials and rational functions. In this context, a "variational problem" or "variational equation" involves finding the solution to a system of equations involving multiple variables, typically under certain conditions or constraints. Variations are often used in optimization problems, where they represent a way
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