These proceedings contain the papers presented at a workshop on Designing Correct Circuits, jointly organised by the Universities of Oxford and Glasgow, and held in Oxford on 26-28 September 1990. There is a growing interest in the application to hardware design of the techniques of software engineering. As the complexity of hardware systems grows, and as the cost both in money and time of making design errors becomes more apparent, so there is an eagerness to build on the success of mathematical techniques in program develop ment. The harsher constraints on hardware designers mean both that there is a greater need for good abstractions and rigorous assurances of the trustworthyness of designs, and also that there is greater reason to expect that these benefits can be realised. The papers presented at this workshop consider the application of mathematics to hardware design at several different levels of abstraction. At the lowest level of this spectrum, Zhou and Hoare show how to describe and reason about synchronous switching circuits using UNilY, a formalism that was developed for reasoning about parallel programs. Aagaard and Leeser use standard mathematical tech niques to prove correct their implementation of an algorithm for Boolean simplification. The circuits generated by their formal synthesis system are thus correct by construction. Thuau and Pilaud show how the declarative language LUSTRE, which was designed for program ming real-time systems, can be used to specify synchronous circuits.

Mary Sheeran follows her critically praised novel, Who Have the Power, with a passionate blend of fiction and nonfiction that explores the world of ballet, in particular, the ballets of George Balanchine. The year is 1988, and the setting is a gala performance at the New York City Ballet, the late George Balanchine's company. Dancer John Fencer struggles with career and romantic frustrations, as well as the manipulations of a wealthy patron who believes she owns all ballet as well as the people who create it. But a much less prominent member of the audience holds the key to everyone's destiny. www.questofthesleepingprincess.com

Elisabeth Barclay, a young suffragist in 1866, is appalled to learn she is half Washo and unaware she is anxiously watched by that tribe and by Masete, the brilliant warrior to whom she was promised. Her struggles with her sense of justice and scorn for her mother's people, increasingly powerful visions by their lake, Tahoe, and growing attraction to Masete come to a head in a battle during which Elisabeth discovers she must claim her role in an ancient prophecy that transcends time.