Encyclopedia > 680

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Centuries: 6th century - 7th century - 8th century

Decades: 630s 640s 650s 660s 670s - 680s - 690s 700s 710s 720s 730s

Years: 675 676 677 678 679 - 680 - 681 682 683 684 685




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... is, for each element g of the group, there exists a natural number n such that g to the power pn is equal to the identity element. Such groups are also called primary. ...