Proof Sorter - Quadratic EquationStage:4 and 5 Challenge Level:
Stage:4 and 5 Challenge Level:
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The idea came from a discussion between Toni Beardon and Bryan Dye (webmaster of MathsNet ) and the program has been written by Elizabeth Ayer.
Published May 2001.
Copyright © 2003.
University of Cambridge. All rights
reserved.
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which also includes the Plus and Motivate sites.
email: nrich@damtp.cam.ac.uk