Department of Computer Science | Institute of Theoretical Computer Science | CADMO

Theory of Combinatorial Algorithms

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar (in cooperation with M. Ghaffari, A. Steger and B. Sudakov)

Mittagsseminar Talk Information

Date and Time: Tuesday, December 14, 2004, 12:15 pm

Duration: This information is not available in the database

Location: This information is not available in the database

Speaker: Mihyun Kang (HU Berlin)

The Asymptotic Number of Outerplanar Graphs

An outerplanar graph is a graph that can be embedded in the plane in such a way that every vertex lies on the outer face. We decompose outerplanar graphs along their connectivity structure and derive the equations of the exponential generating functions. With a singularity analysis of these equations we show that the number of labeled outerplanar graphs on n vertices is asymptotically C n-5/2γnn! for constants C, γ = 7.32098. We also show that for constants α, β, the probability of a random outerplanar graph chosen uniformly at random being connected is asymptotically e = 0.86166, and that the expected number of edges in a random outerplanar graph on n vertices is asymptotically β n = 1.56251n.

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