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math.CO2026
Is the Signed Zarankiewicz Number the Same as the Recursive-line Zarankiewicz Number?
Zhiwei Chen, Yannan Chen, Liqun Qi
Löfberg and Qi introduced the second order Zarankiewicz number \(z_2\), the recursive-line Zarankiewicz number \(z_{RL}\), and the signed Zarankiewicz number \(z_{SL}\) for doubly…
math.CO2026
Recursive-Line Zarankiewicz Numbers with Four Columns
Zhiwei Chen, Yannan Chen
The recursive-line Zarankiewicz number maximizes the number of squares in a structured irreducible sum-of-squares representation encoded by an augmentation of an extremal -fre…