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math.GT2012
Simple loops on 2-bridge spheres in Heckoid orbifolds for 2-bridge links
Donghi Lee, Makoto Sakuma
Following Riley's work, for each 2-bridge link of slope $r\in\QQ$ and an integer or a half-integer greater than 1, we introduce the {\it Heckoid orbifold $\orbs(r;n)$} a…
math.GT2012
Epimorphisms from 2-bridge link groups onto Heckoid groups (I)
Donghi Lee, Makoto Sakuma
Riley "defined" the Heckoid groups for 2-bridge links as Kleinian groups, with nontrivial torsion, generated by two parabolic transformations, and he constructed an infinite family…