Article,

Convergent sequences of dense graphs I: Subgraph frequencies, metric properties and testing

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Advances in Mathematics, 219 (6): 1801--1851 (December 2008)
DOI: 10.1016/j.aim.2008.07.008

Abstract

We consider sequences of graphs ( G n ) and define various notions of convergence related to these sequences: “left convergence” defined in terms of the densities of homomorphisms from small graphs into G n ; “right convergence” defined in terms of the densities of homomorphisms from G n into small graphs; and convergence in a suitably defined metric. In Part I of this series, we show that left convergence is equivalent to convergence in metric, both for simple graphs G n , and for graphs G n with nodeweights and edgeweights. One of the main steps here is the introduction of a cut-distance comparing graphs, not necessarily of the same size. We also show how these notions of convergence provide natural formulations of Szemerédi partitions, sampling and testing of large graphs.

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