# Conformal Mappings for hyperbolic polygon

I am searching for a conformal mapping from the upper halfplane onto a hyperbolic polygon, i.e. the sides of the polygon have to be geodesics.

The classical Schwarz Christoffel theorem does the job for euclidean polygons (see e.g. http://en.wikipedia.org/wiki/Schwarz-Christoffel_mapping).

Does anybody know of a similar constructions in hyperbolic geometry?

Does anybody know of similiar constructions for any other domains?

Any idea will be very wellcomed! I am far from being an expert in conformal mappings and do only know some isolated examples!

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I'm no expert on the subject, but presumably you could take normal polygons and and map them into the unit disc in the usual way. –  Adam Hughes Nov 15 '10 at 7:00
@Adam: a hyperbolic polygon means one whose sides are geodesics for the hyperbolic metric, so they are not usually straight lines. If you take a polygon with straight edges in the upper half plane then the edges are not geodesic for the hyperbolic metric on the upper half plane, and the images in the unit disc are not geodesic for the hyperbolic metric there either. –  Neil Strickland Nov 15 '10 at 8:32
That is exactly, what I am searching. Thanks Neil for the clarification. –  Marc Palm Nov 15 '10 at 8:36
Why is this community wiki? –  Willie Wong Nov 15 '10 at 11:27

See Harmer and Martin's work on Conformal Mappings from the Upper Half Plane to Fundamental Domains on the Hyperbolic Plane.

Some of the ideas developed by Christopher Bishop in the context of computational geometry may also be of interest. See his talks and papers on conformal maps.

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So the work is done already;) Thanks for the refernce! –  Marc Palm Nov 17 '10 at 8:28
I have now found a better reference for the question considered above: Nehari - Conformal Mappings - Chapter V - page 198 –  Marc Palm Nov 24 '10 at 15:42
Good question, I also happen to need an explicit formula for conformally mapping a hyperbolic polygon to the unit disk or the upper half plane. Is that the 1st edition of Nehari's book ? Is this formula explicit ? –  Analysis Now Mar 7 '12 at 0:12