Directed strongly regular graphs from 112-designs

Some families of directed strongly regular graphs with t=μt=μ are constructed by using antiflags of 112-designs.

► Directed strongly regular graphs are constructed from antiflags of 112 designs.
► Directed strongly regular graphs are constructed from flags of 112-designs.
► Using a non-existence result for directed strongly regular graphs, we determine the existence of a certain 112-design.