The notion of spreadability was introduced by El Jai et al . in 1994 to describe expansion phenomena. The principle consists in exploring the evolution of sets where a given property is satisfied. An extension (the A spreadability) was given in 1998 by Bernoussi who considered the measure of such sets. In some cases, the sets can be described by their boundaries and the aim of this paper is to explore some interesting connections of spreadability with wave fronts and level sets. The results are illustrated by a variety of examples.
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