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By Daniel Grieser. Daniel Grieser is Professor of Mathematics at Carl von Ossietzky Universität Oldenburg. Author Daniel Grieser. Exploring Mathematics. Have you ever faced a mathematical problem and had no idea how to approach it?.
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.