Joseph Goguen

Paulo Borba

Abstract: "FOOPS is a concurrent object-oriented language. We give a structural operational semantics for FOOPS, considering features such as classes of objects with associated methods and attributes, object identity, dynamic object creation and deletion, overloading, polymorphism, inheritance with overriding, dynamic binding, concurrency, nondeterminism, atomic execution, evaluation of expressions as background processes, and object protection."

An Operational Semantics for FOOPS

Science of art - commentary on Ramachandran and Hirstein - Art and the Brain - The Emergence of Art and Language in the Human Brain - Cave Art, autism, and the evolution of the human mind - On aesthetic perception

Art and the Brain

Grant Malcolm

Algebraic Semantics of Imperative Programs presents a self-contained and novel executable introduction to formal reasoning about imperative programs. The authors' primary goal is to improve programming ability by improving intuition about what programs mean and how they run. The semantics of imperative programs is specified in a formal, implemented notation, the language OBJ; this makes the semantics highly rigorous yet simple, and provides support for the mechanical verification of program properties. OBJ was designed for algebraic semantics; its declarations introduce symbols for sorts and functions, its statements are equations, and its computations are equational proofs. Thus, an OBJ program is an equational theory, and every OBJ computation proves some theorem about such a theory. This means that an OBJ program used for defining the semantics of a program already has a precise mathematical meaning. Moreover, standard techniques for mechanizing equational reasoning can be used for verifying axioms that describe the effect of imperative programs on abstract machines. These axioms can then be used in mechanical proofs of properties of programs. Intended for advanced undergraduates or beginning graduate students, Algebraic Semantics of Imperative Programs contains many examples and exercises in program verification, all of which can be done in OBJ.

Joseph Goguen

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