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math.CO2015
Completely Positive Tensors and Multi-Hypergraphs
Changqing Xu, Ziyan Luo, Liqun Qi
Completely positive graphs have been employed to associate with completely positive matrices for characterizing the intrinsic zero patterns. As tensors have been widely recognized…
math.CO2015
Characterization Tensors of Balanced Incomplete Block Designs
Liqun Qi, Ziyan Luo
Balanced incomplete block designs (BIBDs) have wide applications in engineering, business and sciences. In this paper, for each (v, k, λ)-BIBD, we construct a strongly symmetric k-…