Mathematics – Complex Variables
Scientific paper
2009-08-31
Comput. Methods Funct. Theory 10 (2010), 303-324
Mathematics
Complex Variables
26 pages, 12 figures
Scientific paper
The equation in the title describes the number of bright images of a point
source under lensing by an elliptic object with isothermal density. We prove
that this equation has at most 6 solutions. Any number of solutions from 1 to 6
can actually occur.
Bergweiler Walter
Eremenko Alexandre
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