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Linear systems of real quadratic forms. II
1982
Proceedings of the American Mathematical Society
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Consider a mapping F: R" -» R3 (n > 3) defined by an ordered triple of real-valued quadratic forms; if some linear combination of these three quadratic forms is positive definite, then the image set under the map is a convex cone.
doi:10.1090/s0002-9939-1982-0640224-0
fatcat:3qcao4lf5rchhlpa7nbyhtnjke