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DTSTART:20160327T010000
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DTSTART;TZID=Europe/Paris:20160503T140000
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DTSTAMP:20260418T180546
CREATED:20160503T120000Z
LAST-MODIFIED:20211104T100825Z
UID:8282-1462284000-1462287600@www.math.ens.psl.eu
SUMMARY:Sur la théorie géométrique des anneaux
DESCRIPTION:Quite recently Eliyahu Rips and Arye Juhasz constructed an Engel but not locally nilpotent group\, i.e. group which satisfies for some positive $n$ the identity $underbrace{[x\,y]\,y\,dots\,y]dots]}_n=e$.This group has non-postitive curvature and big commutative parts\,   some parts have small cancellation and some commute. – This group looks in some sense  like a ring\,  and group multiplication  behaves sometimes like multiplication and sometimes like addition. The  theory of canonic forms of  this group is applicable for rings\,  in particulary in skew field construction. In different sense some  semigroup constructions can be transformed to rings. There is a hope nowdays to develop a geometric ring theory.
URL:https://www.math.ens.psl.eu/evenement/sur-la-theorie-geometrique-des-anneaux/
LOCATION:Salle U+V ENS DMA
CATEGORIES:Séminaire irrégulier
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