Question: A differentiable functional f on an open set S n is quasiconcave if and only if Inequality (36) can be strengthened where f is regular.

A differentiable functional f on an open set S Š† „œn is quasiconcave if and only if
A differentiable functional f on an open set S Š†

Inequality (36) can be strengthened where f is regular.

f(x) f(xo)Vf(xo)x xo) 2 for every x, xo in S (36)

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