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math.CO2021
The least Euclidean distortion constant of a distance-regular graph
Sebastian M. Cioabă, Himanshu Gupta, Ferdinand Ihringer +1
In 2008, Vallentin made a conjecture involving the least distortion of an embedding of a distance-regular graph into Euclidean space. Vallentin's conjecture implies that for a leas…
math.CO2021
Strongly regular graphs satisfying the 4-vertex condition
A. E. Brouwer, F. Ihringer, W. M. Kantor
We survey the area of strongly regular graphs satisfying the 4-vertex condition and find several new families. We describe a switching operation on collinearity graphs of polar spa…