The distribution of the number of small cuts in a random planar triangulation
Zhicheng Gao, Gilles Schaeffer
Abstract
We enumerate rooted 3-connected (2-connected) planar triangulations with respect to the vertices and 3-cuts (2-cuts). Consequently, we show that the distribution of the number of 3-cuts in a random rooted 3-connected planar triangulation with n+3 vertices is asymptotically normal with mean (10/27)n and variance (320/729)n, and the distribution of the number of 2-cuts in a random 2-connected planar triangulation with n+2 vertices is asymptotically normal with mean (8/27)n and variance (152/729)n. We also show that the distribution of the number of 3-connected components in a random 2-connected triangulation with n+2 vertices is asymptotically normal with mean n/3 and variance 8 / 27n.
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