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 words folk and/or mathematics:
“The ties between gentle folk are as pure as water; the links between scoundrels are as thick as honey.”
—Chinese proverb.
“I must study politics and war that my sons may have liberty to study mathematics and philosophy.”
—John Adams (1735–1826)