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By John Hafstrom. John Edward Hafstrom was a Professor of Mathematics and Engineering at the University of Minnesota, Duluth. Author John Hafstrom. 1961 edition. Basic Concepts in Modern Mathematics.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.