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Mar 3, 2015 at 9:37 comment added YCor @DavidHume: no I'm not aware of a reference (especially for the second argument).
Mar 3, 2015 at 8:39 comment added DavidHume Thanks @YCor, is there a good reference for this?
Mar 3, 2015 at 8:38 vote accept DavidHume
Feb 27, 2015 at 17:09 comment added Benjamin Steinberg Another good example is the finitely presented hnn extension of the grigorchuk group using the L-presentation.
Feb 27, 2015 at 15:34 history answered YCor CC BY-SA 3.0