Affiliation:
1. Microsoft Research, Redmond, WA USA
2. The University of the Basque Country (UPV/EHU)
Abstract
We present a mechanically verified implementation of the sorting algorithm
Natural Mergesort
that consists of a few methods specified by their contracts of pre/post conditions. Methods are annotated with assertions that allow the automatic verification of the contract satisfaction. This program-proof is made using the state-of-the-art verifier
Dafny
. We verify not only the standard sortedness property, but also that the algorithm performs a stable sort. Throughout the article, we provide and explain the complete text of the program-proof.
Publisher
Association for Computing Machinery (ACM)
Subject
Computational Mathematics,Logic,General Computer Science,Theoretical Computer Science
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