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The Linear Algebra of UTP (Revised Version)

B. Möller
2006-10
Technical Report, Institute of Computer Science, University of Augsburg, April 2006
Abstract:
We show that the well-known algebra of matrices over a semiring can be used to reason conveniently about predicates as used in the Unifying Theories of Programming. This allows a simplified treatment of the designs of Hoare and He and the prescriptions of Dunne. In addition we connect the matrix approach with the theory of test and condition semirings and the modal operators diamond and box. In particular, we show that matrices of predicate transformers allow an even more streamlined treatment and removal of a restricting assumption on the underlying semirings.

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