Geodesic
Platonic triangles of groups.
Experimental mathematics, Tome 7 (1998) no. 3, pp. 191-219

Voir la notice de l'article provenant de la source European Digital Mathematics Library

Keywords: non-positively curved triangles of finite groups, Gauss-Bonnet theorem, virtually torsion-free groups, free Abelian subgroups, residually finite groups 
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     author = {Alperin, Roger C.},
     title = {Platonic triangles of groups.},
     journal = {Experimental mathematics},
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     year = {1998},
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Alperin, Roger C. Platonic triangles of groups.. Experimental mathematics, Tome 7 (1998) no. 3, pp. 191-219. http://geodesic.mathdoc.fr/item/EXMA_1998__7_3_226747/