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Jun 14, 2012 at 16:31 comment added Lee Mosher Here's a concrete example of this type, one of my favorite groups: the solvable Baumslag-Solitar group $BS(1,n) = <a,t | tat^{-1}=a^n>$.
Jun 14, 2012 at 15:45 history answered Igor Rivin CC BY-SA 3.0