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A D12-symmetric algebraic surface
with 12*11=131 A3-singularities.
It is part of a series of Di-symmetric surfaces with many Aj-singularities (contact me for more information on this series).
All images are created by Oliver Labs using the software surf written by Stephan Endrass and others.
Here is the surf source code of the image above.
Oliver Labs: my homepage: OliverLabs.net, my e-mail: suse TheAtSymbol OliverLabs.net