Let Pn be the collection of
finite-valued functions defined on the nonnegative orthant, En2+, of euclidean
n2-space such that for p ∈ Pn it follows that p : En2+ → E1+ and in addition
(a) p is continuous,
(b) p(αx) = αnp(x),α ≧ 0,
(c) p(x + y) ≧ p(x) + p(y).
It follows readily that Pn is closed with respect to addition and nonnegative
scalar multiplication. Therefore, Pn is a convex cone, whose vertex is the zero
function, in the linear space of real functions defined on En2+. The purpose of this
paper is to investigate the extremal elements of Pn.
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