Four commonly used multivalued algebras, the disjoint system of Post algebra developed by Epstein, the monotonic system of algebra called Muehldorf by some authors, the free system of algebra introduced by Braddock and Epstein, and the Herrmann system of algebra generalized here from its original three element algebra, are shown to be isomorphic. Transformations are then developed for transforming from one algebra to another. An example problem is presented to illustrate transforming from any of the above to the disjoint system of Post algebra.

This is the third edition of a rather well known textbook and/or reference book dealing with the principles of operation of digital computers or digital data handling devices. It is primarily concerned with hardware and discusses programming to the extent necessary to illustrate the principles of computer operation. It is most useful as a text for students without significant knowledge of the internal structure of digital machines but with a moderate maturity and a little mathematical sophistication. This reviewer has used it with all levels of undergraduates, with beginning graduate students when supplemented, and in adult education courses. The material is not covered in great depth but it is not a superficial survey either. This text might serve adequately for an introductory Computer Science course or even with a proper group of high school students.