Jason S. Williford

collaborators

2 papers

math.CO2021

A Classification of Hyperfocused 12-Arcs

Philip DeOrsey, Stephen G. Hartke, Jason Williford

A $k$ -arc in PG( $2, q$ ) is a set of $k$ points no three of which are collinear. A hyperfocused $k$ -arc is a $k$ -arc in which the $(2 k)$ secants meet some external line in exa…

math.CO2019

On few-class $Q$ -polynomial association schemes: feasible parameters and nonexistence results

Alexander L. Gavrilyuk, Janoš Vidali, Jason S. Williford

We present the tables of feasible parameters of primitive $3$ -class $Q$ -polynomial association schemes and $4$ - and $5$ -class $Q$ -bipartite association schemes (on up to $2800$ , $1…

A Classification of Hyperfocused 12-Arcs

On few-class Q-polynomial association schemes: feasible parameters and nonexistence results

On few-class $Q$ -polynomial association schemes: feasible parameters and nonexistence results