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SUMMARY:Some remarks on 2-star-permutability and descent in regular catego
 ries. - Marino Gran\, Universite  catholique de Louvain\, Belgium
DTSTART:20130129T141500Z
DTEND:20130129T151500Z
UID:TALK42447@talks.cam.ac.uk
CONTACT:Julia Goedecke
DESCRIPTION:The context of regular multi-pointed categories [1] provides a
  convenient framework to investigate and compare some crucial exactness pr
 operties arising in pointed and in non-pointed categorical algebra. In\nth
 is talk the basic ideas of this approach will be recalled\, and a couple o
 f recent results will be explained more in detail. The first one is a\ncha
 racterisation of 2-star-permutable categories\, which are a common extensi
 on of regular Mal’tsev and of regular subtractive categories (joint work
  with Diana Rodelo). The second one concerns the effective descent\nmorphi
 sms in a regular multi-pointed category (joint work with Olivette Ngaha).\
 n\n[1] M. Gran\, Z. Janelidze and A. Ursini\, A good theory of ideals in r
 egular multi-pointed categories\, J. Pure Appl. Algebra 216\, 2012\, 1905-
 1919.
LOCATION:MR5\, Centre for Mathematical Sciences
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