a1 Institut de Mathématiques, Université Pierre et Marie Curie, 4, Place Jussieu, F-75252 Paris, France. e-mail: email@example.com
The sister of Eisenstein–Picard modular group is described explicitly in , whose quotient is a noncompact arithmetic complex hyperbolic 2-orbifold of minimal volume (see ). We give a construction of a fundamental domain for this group. A presentation of that lattice can be obtained from that construction, which relates to one of Mostow's lattices.
(Received March 12 2010)
(Revised June 22 2010)
(Online publication October 08 2010)