Chunfeng Cui

works on

augmented zarankiewicz 1 c4-free graphs 1 extremal graph theory 1 irreducibility 1 zarankiewicz numbers 1

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20242026

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math.NT2025

The SOS Rank of Biquadratic Forms

Liqun Qi, Chunfeng Cui, Yi Xu

In 1973, CalderÃ³n proved that an $m \times 2$ positive semidefinite (psd) biquadratic form can always be expressed as the sum of $\frac{3 m ( m + 1 )}{2}$ squares of quadratic forms. Ve…