<p>A pseudo-cone in ℝ<sup><i>n</i></sup> is a nonempty closed convex set <i>K</i> not containing the origin and such that <i>λK</i> ⊆ <i>K</i> for all <i>λ</i> ≥ 1. It is called a <i>C</i>-pseudo-cone if <i>C</i> is its recession cone, where <i>C</i> is a pointed closed convex cone with interior points. The cone-volume measure of a pseudo-cone can be defined similarly as for convex bodies, but it may be infinite. After proving a necessary condition for cone-volume measures of <i>C</i>-pseudo-cones, we introduce suitable weights for cone-volume measures, yielding finite measures. Then we provide a necessary and sufficient condition for a Borel measure on the unit sphere to be the weighted cone-volume measure of some <i>C</i>-pseudo-cone.</p>

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Weighted cone-volume measures of pseudo-cones

  • Rolf Schneider

摘要

A pseudo-cone in ℝn is a nonempty closed convex set K not containing the origin and such that λKK for all λ ≥ 1. It is called a C-pseudo-cone if C is its recession cone, where C is a pointed closed convex cone with interior points. The cone-volume measure of a pseudo-cone can be defined similarly as for convex bodies, but it may be infinite. After proving a necessary condition for cone-volume measures of C-pseudo-cones, we introduce suitable weights for cone-volume measures, yielding finite measures. Then we provide a necessary and sufficient condition for a Borel measure on the unit sphere to be the weighted cone-volume measure of some C-pseudo-cone.