Abstract
This paper proves that, if there is an ordered set P that is not reconstructible, then each of its two-point-deleted subsets must be isomorphic to another one, or, it must violate a condition that is related to, but weaker than, rigidity. The conditions are inspired by an argument by Bollobas and they provide a connection between positive reconstruction results and partial counterexamples that was, so far, nonexistent in order reconstruction.
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Schröder, B.S.W. Ordered Sets that are Reconstructible from Two Cards and the Number of Comparabilities. Order 31, 365–371 (2014). https://doi.org/10.1007/s11083-013-9306-4
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DOI: https://doi.org/10.1007/s11083-013-9306-4