Positive Semi-Definite and Sum of Squares Biquadratic Polynomials
Hilbert proved in 1888 that a positive semi-definite (PSD) homogeneous quartic polynomial of three variables always can be expressed as the sum of squares (SOS) of three quadratic polynomials, and a psd homogeneous quartic polynomial of four variables may not be sos. Only after 87 years, in 1975, Ch...
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| Principais autores: | , , |
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| Formato: | Artigo |
| Idioma: | Inglês |
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MDPI AG
2025-07-01
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| coleção: | Mathematics |
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| Acesso em linha: | https://www.mdpi.com/2227-7390/13/14/2294 |
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