Plausible clocks: constant size logical clocks for distributed systems*

We address the problem, proposed by Gerth. of verifying that a simplified version of the lazy caching algorithm of Afek, Brown, and Merritt is sequentially consistent. We specify the algorithm and sequential consistency in TLA+. a formal specification language based on TLA (the Temporal Logic of Actions). We then describe how to construct and check a formal TLA correctness proof.