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Communication Complexity and Graph Families

Communication Complexity and Graph Families Given a graph G and a pair (F1, F2) of graph families, the function GDISJG,F1,F2 takes as input, two induced subgraphs G1 and G2 of G, such that G1 F1 and G2 F2 and returns 1 if V(G1) V(G2)= and 0 otherwise. We study the communication complexity of this problem in the two-party model. In particular, we look at pairs of hereditary graph families. We show that the communication complexity of this function, when the two graph families are hereditary, is sublinear if and only if there are finitely many graphs in the intersection of these two families. Then, using concepts from parameterized complexity, we obtain nuanced upper bounds on the communication complexity of GDISJG, F1, F2. A concept related to communication protocols is that of a (F1, F2)-separating family of a graph G. A collection F of subsets of V(G) is called a (F1,F2)-separating family for G, if for any two vertex disjoint induced subgraphs G1 F1,G2 F2, there is a set F F with V(G1) F and V(G2) F = . Given a graph G on n vertices, for any pair (F1,F2) of hereditary graph families with sublinear communication complexity for GDISJG,F1,F2, we give an enumeration algorithm that finds a subexponential sized (F1,F2)-separating family. In fact, we give an enumeration algorithm that finds a 2o(k)nO(1) sized (F1,F2)-separating family, where k denotes the size of a minimum sized set S of vertices such that V(G) S has a bipartition (V1,V2) with G[V1] F1 and G[V2] F2. We exhibit a wide range of applications for these separating families, to obtain combinatorial bounds, enumeration algorithms, as well as exact and FPT algorithms for several problems. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png ACM Transactions on Computation Theory (TOCT) Association for Computing Machinery

Communication Complexity and Graph Families

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Publisher
Association for Computing Machinery
Copyright
Copyright © 2019 ACM
ISSN
1942-3454
eISSN
1942-3462
DOI
10.1145/3313234
Publisher site
See Article on Publisher Site

Abstract

Given a graph G and a pair (F1, F2) of graph families, the function GDISJG,F1,F2 takes as input, two induced subgraphs G1 and G2 of G, such that G1 F1 and G2 F2 and returns 1 if V(G1) V(G2)= and 0 otherwise. We study the communication complexity of this problem in the two-party model. In particular, we look at pairs of hereditary graph families. We show that the communication complexity of this function, when the two graph families are hereditary, is sublinear if and only if there are finitely many graphs in the intersection of these two families. Then, using concepts from parameterized complexity, we obtain nuanced upper bounds on the communication complexity of GDISJG, F1, F2. A concept related to communication protocols is that of a (F1, F2)-separating family of a graph G. A collection F of subsets of V(G) is called a (F1,F2)-separating family for G, if for any two vertex disjoint induced subgraphs G1 F1,G2 F2, there is a set F F with V(G1) F and V(G2) F = . Given a graph G on n vertices, for any pair (F1,F2) of hereditary graph families with sublinear communication complexity for GDISJG,F1,F2, we give an enumeration algorithm that finds a subexponential sized (F1,F2)-separating family. In fact, we give an enumeration algorithm that finds a 2o(k)nO(1) sized (F1,F2)-separating family, where k denotes the size of a minimum sized set S of vertices such that V(G) S has a bipartition (V1,V2) with G[V1] F1 and G[V2] F2. We exhibit a wide range of applications for these separating families, to obtain combinatorial bounds, enumeration algorithms, as well as exact and FPT algorithms for several problems.

Journal

ACM Transactions on Computation Theory (TOCT)Association for Computing Machinery

Published: Mar 15, 2019

Keywords: Communication complexity

References