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20022025
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7.1k citations

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11 papers · 1 filter

math.CO2020

Classifying edge-biregular maps of negative prime Euler characteristic

Olivia Jeans, Jozef Širáň

An edge-biregular map arises as a smooth normal quotient of a unique index-two subgroup of a full triangle group acting with two edge-orbits. We give a classification of all finite…

math.CO20173 cited

Mixed Moore Cayley graphs

Grahame Erskine

The degree-diameter problem seeks to find the largest possible number of vertices in a graph having given diameter and given maximum degree. There has been much recent interest in…

math.CO2017

The spectra of lifted digraphs

C. Dalfó, M. A. Fiol, J. Širáň

We present a method to derive the complete spectrum of the lift of a base digraph , with voltage assignments on a (finite) group . The method is based on assigning to $…

math.CO20172 cited

On Hamilton Decompositions of Infinite Circulant Graphs

Darryn Bryant, Sarada Herke, Barbara Maenhaut +1

The natural infinite analogue of a (finite) Hamilton cycle is a two-way-infinite Hamilton path (connected spanning 2-valent subgraph). Although it is known that every connected $2k…

math.CO20165 cited

Substitution-based sequences with absolutely continuous diffraction

Lax Chan, Uwe Grimm

Modifying Rudin's original construction of the Rudin-Shapiro sequence, we derive a new substitution-based sequence with purely absolutely continuous diffraction spectrum.

math.CO2016

Juxtaposing Catalan permutation classes with monotone ones

Robert Brignall, Jakub Sliacan

This paper enumerates all juxtaposition classes of the form "Av() next to Av()", where is a permutation of length three and is a permutation of length two. We u…