Geodesic
On the simple connectivity at infinity of groups
Bollettino della Unione matematica italiana, Série 8, 6B (2003) no. 3, pp. 739-748.

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We study the simple connectivity at infinity of groups of finite presentation, and we give a geometric proof of its invariance under quasi-isometry in a special case.
In questo articolo si definisce e si studia la nozione di semplice connessione all'infinito dei gruppi di presentazione finita, dando poi, in un caso particolare, una prova geometrica della sua invarianza per quasi-isometrie. 
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Otera, Daniele Ettore. On the simple connectivity at infinity of groups. Bollettino della Unione matematica italiana, Série 8, 6B (2003) no. 3, pp. 739-748. http://geodesic.mathdoc.fr/item/BUMI_2003_8_6B_3_a15/

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