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- W2950787575 abstract "A famous theorem of Hilbert from 1888 states that a positive semidefinite (psd) real form is a sum of squares (sos) of real forms if and only if $n=2$ or $d=1$ or $(n,2d)=(3,4)$, where $n$ is the number of variables and $2d$ the degree of the form. In 1976, Choi and Lam proved the analogue of Hilbert's Theorem for symmetric forms by assuming the existence of psd not sos symmetric $n$-ary quartics for $n geq 5$. In this paper we complete their proof by constructing explicit psd not sos symmetric $n$-ary quartics for $n geq 5$." @default.
- W2950787575 created "2019-06-27" @default.
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- W2950787575 date "2015-05-29" @default.
- W2950787575 modified "2023-09-27" @default.
- W2950787575 title "On the Choi-Lam analogue of Hilbert's 1888 theorem for Symmetric Forms" @default.
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