@UNPUBLISHED{publication1, title = "Stability properties characterising n-permutable categories", author = "{JACQMIN, Pierre-Alain} and {RODELO, Diana}", year = "2017-05-14", abstract = "The purpose of this paper is two-fold. A first and more concrete aim is to characterise n-permutable categories through certain stability properties of regular epimorphisms. These characterisations allow us to recover the ternary terms and the (n+1)-ary terms describing n-permutable varieties of universal algebras. A second and more abstract aim is to explain two proof techniques, by using the above characterisation as an opportunity to provide explicit new examples of their use:
- an embedding theorem for n-permutable categories which allows us to follow the varietal proof to show that an n-permutable category has certain properties;
- the theory of unconditional exactness properties which allows us to remove the assumption of the existence of colimits, in particular when we use the approximate co-operations approach to show that a regular category is n-permutable. ", url = "http://www.mat.uc.pt/preprints/eng\_2017.html", note = "" }