Folk Mathematics
If modern mathematical practices are what distinguish modern professional mathematicians from older ideas of folk mathematics. Although such "folk" practices may well include useful formulae or algorithms, they are generally without the accompanying proof discipline.
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Famous quotes containing the word folk:
“In the past, the English tried to impose a system wherever they went. They destroyed the nation’s culture and one of the by- products of their systemisation was that they destroyed their own folk culture.”
—Martin Carthy (b. 1941)