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math.NA2018
Regularity radius: Properties, approximation and a not a priori exponential algorithm
David Hartman, Milan Hladik
The radius of regularity sometimes spelled as the radius of nonsingularity is a measure providing the distance of a given matrix to the nearest singular one. Despite its possible a…
math.CO2018
Morphism extension classes of countable -colored graphs
Andrés Aranda, David Hartman
In~\cite{Hartman:2014}, Hartman, Hubi\v cka and Ma\v sulović studied the hierarchy of morphism extension classes for finite -colored graphs, that is, undirected graphs without l…