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math.AG2015★ 14 cited
The analogue of Hilbert's 1888 theorem for Even Symmetric Forms
Charu Goel, Salma Kuhlmann, Bruce Reznick
Hilbert proved in 1888 that a positive semidefinite (psd) real form is a sum of squares (sos) of real forms if and only if or or , where is the number…
math.AG2015
On the Choi-Lam analogue of Hilbert's 1888 theorem for Symmetric Forms
Charu Goel, Salma Kuhlmann, Bruce Reznick
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 or or , w…