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Author: WikiMatrix
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English[en]
Modern versions of the ping-pong lemma can be found in many books such as Lyndon&Schupp, de la Harpe, Bridson&Haefliger and others.
Portuguese[pt]
Versões modernas do lema do ping-pong podem ser vistas em vários livros como Lyndon&Schupp, de la Harpe, Bridson&Haefliger e outros.