Year: 2019
Type: article
Abstract: Kleene algebra with tests (KAT) was introduced as an algebraic structure to model and reason about classic imperative programs, i.e. sequences of discrete transitions guarded by Boolean tests.This paper introduces two generalisations of this structure able to express programs as weighted transitions and tests with outcomes in non necessarily bivalent truth spaces: graded Kleene algebra with tests (GKAT) and a variant where tests are also idempotent (I-GKAT).In this context, and in analogy to Kozen's encoding of Propositional Hoare Logic (PHL) in KAT we discuss the encoding of a graded PHL in I-GKAT and of its while-free fragment in GKAT.Moreover, to establish semantics for these structures four new algebras are defined: F SET (T ), F REL(K, T ) and F LAN G(K, T ) over complete residuated lattices K and T , and M (n, A) over a GKAT or I-GKAT A. As a final exercise, the paper discusses some program equivalence proofs in a graded context.
Institutions: INESC TEC, University of Minho, University of Aveiro
Language: English
Subfield: Software
Field: Computer Science
Domain: Physical Sciences
Open Access status: diamond
Awards: G1167214205, G491858407
OpenAlex ID: W2998565684