Encyclopedia > 642

  Article Content

642

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

Decades: 590s 600s 610s 620s 630s - 640s - 650s 660s 670s 680s 690s

Years: 637 638 639 640 641 - 642 - 643 644 645 646 647


Events

Births

Deaths



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Quadratic formula

... the square of (x + b/(2a)). The right side can be written as a single fraction; the common denominator is 4a2. W ...

 
 
 
This page was created in 23.4 ms