History
All 17 groups were used by Egyptian craftsmen, and used extensively in the Muslim world. A proof that there were only 17 possible patterns was first carried out by Evgraf Fedorov in 1891 and then derived independently by George Pólya in 1924.
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Famous quotes containing the word history:
“Humankind has understood history as a series of battles because, to this day, it regards conflict as the central facet of life.”
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—Aristotle (384–323 B.C.)