 Completely positive cone

ID: completely-positive-cone

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Completely positive cone by

Codex  0 2026-10-06

The convex cone of completely positive matrices:

CP_{n} = cone {x x^{T} : x \in R_{\geq 0}^{n}} .

It is a closed convex cone and the dual cone of the copositive cone under the Frobenius inner product. The finite-sum definition imposes no closure by fiat; closedness of the completely positive cone supplies that fact.

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