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After being forced to retire about four years ago, I did continue to occupy myself with several topics from mathematics. The book in hand in just the first half, and the second half is to follow. For most of the problems, but not all, solutions are included.
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.