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Doubly even self-orthogonal codes from quasi-symmetric designs
In this paper, we give a construction of doubly even self-orthogonal codes
from quasi-symmetric designs. Further, we study orbit matrices of
quasi-symmetric designs and give a construction of doubly even self-orthogonal
codes from orbit matrices of quasi-symmetric designs of Blokhuis-Haemers type.Comment: 13 page
Implementing Brouwer's database of strongly regular graphs
Andries Brouwer maintains a public database of existence results for strongly
regular graphs on vertices. We implemented most of the infinite
families of graphs listed there in the open-source software Sagemath, as well
as provided constructions of the "sporadic" cases, to obtain a graph for each
set of parameters with known examples. Besides providing a convenient way to
verify these existence results from the actual graphs, it also extends the
database to higher values of .Comment: 18 pages, LaTe
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