Question: Given F = phi(x), when x>=0, F>=0, when x

Given F = phi(x), when x>=0, F>=0, when x <= 0, F <=0, when x =0, F =0, but otherwise we don't know if F is strictly increasing or decreasing on x.

E(x) = integral from 0 to x over phi(x)dx

x is between x_min and x_max

Show that E(x) is quasiconvex.

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