Question: Let f and g be affine functionals on a linear space X, and let S X be a convex set on which g(x) 0. The

Let f and g be affine functionals on a linear space X, and let S Š† X be a convex set on which g(x) ‰  0. The function
Let f and g be affine functionals on a linear

is both quasi concave and quasi convex on S.

h(x) = g(x)

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