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STEPHAN KREUTZER COMPLEXITY OF MODEL-CHECKING PROBLEMS 20/81<br />

INTRODUCTION COMPLEXITY UPPER BOUNDS COMPOSITION LOCALITY LOCALISATION GRIDS GRID-LIKE MINORS LABELLED WEBS<br />

Feferman-Vaught Style Theorems<br />

Theorem. Let G, H be graphs, v ∈ V(G)<br />

u ∈ V(G) such that u = V(G)∩V(H)<br />

w ∈ V(H)<br />

For all q ≥ 0, tp q (G∪H, uvw) is determined by tp q (G, uv) and tp q (uw)<br />

Furthermore, there is an algorithm that computes tp q (G∪H, uvw) from<br />

tp q (G, uv) and tp q (uw).<br />

This suggests a model-checking algorithm on graphs which can<br />

recursively be decomposed into sub-graphs of constant size.

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