An Example of a delta-Extendible Proof with a Spurious Interpolant

We give an example of a model and a D-extendible refutation that a given property hold for all cycles up to k = 5. We show that a classical partition of the axioms into initial and final sets A, B where the common variables reside in cycle 2 leads to a 'spurious' interpolant. The interpolant is spurious in the sense that there exists a legeal path from the states conforming to it and a state that violates the specified property.

By: Oded Fuhrmann; Shlomo Hoory

Published in: H-0265 in 2009


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