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math.CO2026
On the Smallest Eigenvalues and Quantum Chromatic Numbers of Hamming Graphs and Generalizations
Yu Ning, Jack H. Koolen, Xiande Zhang
The smallest eigenvalues of (distance-j) Hamming graphs with distance parameter j at least half the length were completely determined by Brouwer et al. (2018). In the present work,…
math.CO2019
Constructions of unextendible entangled bases
Fei Shi, Xiande Zhang, Yu Guo
We provide several constructions of special unextendible entangled bases with fixed Schmidt number (SUEB) in for $2\leq k\leq d\leq d…