Author

C. Dalfó

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Open access Aug 2026

A note on three-quarters circulant digraphs

We introduce and study a new family of circulant digraphs associated with the cyclic group ${\mathbb Z}_N$, obtained by restricting admissible combinations of two generators $a$ and $b$ to three coordinate sectors. The resulting distance-like function differs from the standard directed distance in circulant digra...

C. Dalf'o, M. Fiol, M. Reyes · Utilitas mathematica · 0 citations

Preprint Aug 2026

On the achromatic index of Johnson graphs $J(n,2)$

In this paper, we study proper and complete edge-colorings of Johnson graphs $J(n,2)$, also called $n$-triangular graphs. They are isomorphic both to the 2-token graphs of complete graphs and to the line graphs of complete graphs. A $t$-edge-coloring of a graph $G$ is a function that assigns one color from $\{1,2,\ldot...

G. Araujo-Pardo, C. Dalf'o, M. Reyes · 0 citations