Practice nursing in N ew Z ealand is not well described in the literature. One survey
illustrated that most of the N ew Z ealand practice nurses sampled did not know of the …

We introduce concurrent Kleene algebra with tests (CKAT) as a combination of Kleene
algebra with tests (KAT) of Kozen and Smith with concurrent Kleene algebras (CKA) …

An algebraic approach to the design of program construction and verification tools is applied
to separation logic. The control-flow level is modelled by power series with convolution as …

A notion of convolution is presented in the context of formal power series together with lifting
constructions characterising algebras of such series, which usually are quantales. A number …

We survey the well-known algebraic laws of sequential programming, and propose some
less familiar laws for concurrent programming. On the basis of these laws, we derive the …

We provide simple equational principles for deriving rely-guarantee-style inference rules
and refinement laws based on idempotent semirings. We link the algebraic layer with …

We investigate the connection between a general form of Concurrent Separation Logic
(CSL), a logic for modular reasoning about concurrent programs, and Concurrent Kleene …

We present ribbon proofs, a diagrammatic system for proving program correctness based on
separation logic. Ribbon proofs emphasise the structure of a proof, so are intelligible and …

Four well-known methods for presenting semantics of a programming language are:
denotational, deductive, operational, and algebraic. This essay presents algebraic laws for …

A trace of the execution of a concurrent object-oriented program can be displayed in two-
dimensions as a diagram of a non-metric finite geometry. The actions of a programs are …