Endnotes
- 1 ThinkMath, Teacher Guide, Volume 1, Harcourt School Publishers, 2.
- 2 http://standards.nctm.org/document/appendix/alg.htm
- 3 David W Farmer. Groups and Symmetry: A Guide to Discovering Mathematics, Mathematical World, Vol. 5, 15.
- 4 Farmer, 15-21
- 5 Farmer, 42.
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