The Dewey decimal system has nothing to do with mathematics, it is a system for the classification of books by subject, used in libraries. It was developed by Melvil Dewey in 1876 and, as the name suggests, classifies books into ten major classes, each with ten divisions and each division having ten sections.
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The Dewy Classification System is how libraries sort out all the books.
Computers use a binary system, not decimal.
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The Dewey Decimal System and the Library of Congress Classification System.
The Dewey Decimal Classification (DDC), or Dewey Decimal System, is a proprietary library classification system first published in the United States by Melvil Dewey in 1876.