The Dewey Decimal System, is a library classification system first published in the United States in 1876. It is currently maintained by the Online Computer Library Center (OCLC), a non-profit cooperative that serves libraries.
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Dewey decimal system
Melvil Dewy
The Dewey decimal system is the way the library is organized. Has almost nothing to do with math.
Melvil Dewey created the Dewey Decimal system. It is a classification system used by libraries, and not what is meant in the question. The decimal number system is the number system that we all use on a daily basis; it was invented by a succession of Arab and Hindu mathematicians beginning about 1400 years ago.
Melvil Dewey