BULLETIN OF THE AUSTRALIAN MATHEMATICAL SOCIETY, cilt.98, sa.2, ss.319-330, 2018 (SCI-Expanded)
First, we extend the notion of stratified spaces to diffeology. Then we characterise the subspace of stratified differential forms, or zero-perverse forms in the sense of Goresky-MacPherson, which can be extended smoothly into differential forms on the whole space. For that we introduce an index which outlines the behaviour of the perverse forms on the neighbourhood of the singular strata.