All points a = (a1,..., a2) where the function f (x1,..., xn) has an extremum subject to
Chapter 4, Problem 23(choose chapter or problem)
All points a = (a1,..., a2) where the function f (x1,..., xn) has an extremum subject to the constraint that g(x1,..., xn) = c, are solutions to the system of equations f x1 = g x1 . . . f xn = g xn g(x1,..., xn) = c
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