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March 2010
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modular arithmetic

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There are many errors that can occur when numbers are written, printed or transferred in any manner. Luckily, there are schemes in place to detect, and in some cases even correct, such errors almost immediately. Emily Dixon takes a break and discovers that codes are not just for sleuths.

Tags: error-correcting code : modular arithmetic : permutation : barcode : ISBN : non-commutativity