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math.CO2026
A unified framework for existing and new constructions of Neumaier graphs
Aida Abiad, Wouter Castryck, Maarten De Boeck +2
A Neumaier graph is a non-complete edge-regular graph containing a regular clique; it is called strictly Neumaier if it is not strongly regular. In this paper we present a construc…
cs.IT2026
Semidefinite and linear programming bounds for sum-rank-metric codes and non-existence results
Aida Abiad, Antonina P. Khramova, Sven C. Polak +1
The sum-rank metric provides a unifying framework that generalizes both the celebrated Hamming and rank metrics, and has found applications in areas such as network coding, distrib…