Picard modular group

In mathematics, a Picard modular group, studied by , is a group of the form SU("J","L"), where "L" is a 3-dimensional lattice over the ring of integers of an imaginary quadratic field and "J" is a hermitian form on "L" of signature (2, 1). Picard modular groups act on the unit sphere in C2 and the quotient is called a Picard modular surface.