ping-pong lemma

theorem about sufficient conditions for ensuring that that several elements in a group acting on a set freely generate a free subgroup of that group

en-US/ˈpɪŋ - pɑŋ ˈlɛmə/
en-GB/ˈpɪŋ - ˈpɒŋ ˈlɛmə/

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lemma