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Apr 5, 2013 at 5:31 comment added Mariano Suárez-Álvarez An immense number of instances where involutions show up and play a significant role have absolutely nothing to do with the ends of ℝ. I would be awed to see a concrete connection between the Feit-Thompson theorem that simple finite groups have non-trivial involutions (and its central role in the classification of simple groups) and the ends of ℝ, say.
Apr 4, 2013 at 23:58 history answered Rodrigo A. Pérez CC BY-SA 3.0