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
LIMITED DISTRIBUTION NOTICE:
This Research Report is available. This report has been submitted for publication outside of IBM and will probably be copyrighted if accepted for publication. It has been issued as a Research Report for early dissemination of its contents. In view of the transfer of copyright to the outside publisher, its distribution outside of IBM prior to publication should be limited to peer communications and specific requests. After outside publication, requests should be filled only by reprints or legally obtained copies of the article (e.g., payment of royalties). I have read and understand this notice and am a member of the scientific community outside or inside of IBM seeking a single copy only.
Questions about this service can be mailed to reports@us.ibm.com .