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Dec 22, 2015 at 17:46 comment added Yakov In the first Geoff Robinson's example (there $A=\Phi(G)$), the class of B is p-1<p and so his group does not satisfy (c).
Nov 24, 2013 at 21:06 vote accept Yassine Guerboussa
Nov 24, 2013 at 20:53 history edited Yassine Guerboussa CC BY-SA 3.0
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Nov 24, 2013 at 20:50 answer added Derek Holt timeline score: 6
Nov 24, 2013 at 20:50 comment added Yassine Guerboussa This is exactly the case that I want to avoid. The question is not very well formulated, I will edit it.
Nov 24, 2013 at 20:47 comment added Geoff Robinson As it stands, you do not exclude the possibility that $x \in A$ and $A = B$. I think the group $G = C_{p} \wr C_{p}$ satisfies these conditions with $A = B$ elementary Abelian of rank $p$ and any $x \in A$, any $y \in G \backslash A$.
Nov 24, 2013 at 20:33 history edited Yassine Guerboussa CC BY-SA 3.0
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Nov 24, 2013 at 20:06 history asked Yassine Guerboussa CC BY-SA 3.0