The rank of variants of nilpotent pseudovarieties
 
 
Description:  In this talk, we investigate the rank of classes defined by several of the variants of nilpotent semigroups in the sense of Mal'cev. For several of them, we even give finite basis of pseudoidentities. We show that the pseudovariety $\mathsf{NT}$ has infinite rank and, therefore, it is non-finitely based. Finally, we give a complete comparison diagram of them.
Date:  2015-12-15
Start Time:   15:30
Speaker: 

M. Hossein Shahzamanian C. (CMUP, Univ. Porto)

Institution:  CMUP, Univ. Porto
Place:  Sala 5.5
Research Groups: -Algebra, Logic and Topology
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