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Reference.org
Picard modular surface
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<p>In mathematics, a Picard modular surface, studied by <a href="/facts/%25C3%2589mile_Picard/fq6m32JE">Picard</a> (1881), is a <a href="/facts/Complex_surface/Lr1rd0Nf">complex surface</a> constructed as a quotient of the unit ball in C2 by a <a href="/facts/Picard_modular_group/bq5M4DLa">Picard modular group</a>. Picard modular surfaces are some of the simplest examples of <a href="/facts/Shimura_varieties/varFgmR6">Shimura varieties</a> and are sometimes used as a test case for the general theory of Shimura varieties. </p>