arXiv · 1211.1998
We show that a group with a presentation satisfying the C(6) small cancellation condition cannot contain a subgroup isomorphic to F_2 X F_2.
Hadi Bigdely, Daniel T. Wise. 2012-11-08. C(6) groups do not contain F_2 X F_2. https://arxiv.org/abs/1211.1998
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