Affine Buildings and Tropical Convexity

Details Affine Buildings and Tropical Convexity Affine Buildings and Tropical Convexity

2007-06-13

arxiv.org/abs/0706.1918v1

Albanian J. Math. 1 (2007), no. 4, 187--211

Mathematics

Metric Geometry

22 pages, 4 figures

Scientific paper

The notion of convexity in tropical geometry is closely related to notions of convexity in the theory of affine buildings. We explore this relationship from a combinatorial and computational perspective. Our results include a convex hull algorithm for the Bruhat--Tits building of SL$_d(K)$ and techniques for computing with apartments and membranes. While the original inspiration was the work of Dress and Terhalle in phylogenetics, and of Faltings, Kapranov, Keel and Tevelev in algebraic geometry, our tropical algorithms will also be applicable to problems in other fields of mathematics.

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