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Circle packing and Möbius transformations
Porvichová, Janka ; Zeman, Peter (advisor) ; Kratochvíl, Jan (referee)
A graph can be represented by various geometric representations. In this work we focus on the circle packing representation. We state various concepts impor- tant for proving results regarding this kind of representation. We introduce a known proof of existence of a circle packing for planar graphs and a proof of existence of a primal-dual circle packing for 3-connected graphs. Next, we focus on computational complexity of extending the representation for a given partial circle packing. We examine the proof of the theorem stating that deciding whet- her such an extension exists is an NP-hard problem. We introduce our theoretical algorithm for extension construction based on real RAM machine. 1