Gregory Robson

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math.CO2024

On the BCI Problem

Ted Dobson, Gregory Robson

Let $G$ be a group. The BCI problem asks whether two Haar graphs of $G$ are isomorphic if and only if they are isomorphic by an element of an explicit list of isomorphisms. We firs…

math.CO2024

Recognizing bicoset digraphs which are $X$ -joins and automorphism groups of bicoset digraphs

Rachel Barber, Ted Dobson, Gregory Robson

We examine bicoset digraphs and their natural properties from the point of view of symmetry. We then consider connected bicoset digraphs that are $X$ -joins with collections of empt…

On the BCI Problem

Recognizing bicoset digraphs which are X-joins and automorphism groups of bicoset digraphs

Recognizing bicoset digraphs which are $X$ -joins and automorphism groups of bicoset digraphs