Fig. 3.

Abstract interpretation. Complex (i) is ‘exploded’ into its local views (ii), (iii) and (iv) by an abstraction process λ described in the main text. The concretization process γ stitches the local views back into complexes, reproducing the original, but also others, reflecting the fact that information was abstracted away. Reachability via local views is a fast overapproximation, enabling useful real-time analysis that would otherwise be prohibitive