In this paper we are concerned with the problem of finding the global minimum of a concave function over a closed, convex, possibly unbounded set in R n. The intrinsic difficulty of this problem is ...

This article was originally published with the title “Turning Concave and Convex Surfaces” inScientific American Magazine Vol. 102 No. 24(June 1910), p. 485doi:10.1038 ...

The classical one-sector problem of optimal growth theory over an infinite horizon in continuous times with a convex-concave production function is studied. Consumption and investment are subject to ...

A plano-convex lens is compose of a plane and convex surfaces, has a positive focal length.It is used for the changing between point light source and parallel beam.It is mean when the light through ...