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There is an article by two of the authors of PowerMath in the Proceedings of
the 1986 Symposium on Symbolic and Algebraic Computation (sponsored by
ACM SIGSAM): "PowerMath, A System for the Macintosh", by J. Davenport and
C. Roth, pp. 13-15.  Abstract from the paper:

	PowerMath is a symbolic algebra system for the MacIntosh
	computer.  This paper outlines the design decisions that were
	made during its development, and explains how the novel
	MacIntosh environment helped and hindered the development of the
	system.  While the interior of PowerMath is fairly conventional, the
	user interface has many novel features.  It is these that make
	PowerMath not just another microcomputer algebra system.


Bruce Char
Dept. of Computer Science
University of Waterloo