
 Euclid's Elements in Greek (Site not responding. Last check: ) 
  Euclid's Elements is by far the most famous mathematical work of classical antiquity, and also has the distinction of being the world's oldest continuously used mathematical textbook. 
  Most of the theorems appearing in Euclid's Elements were not discovered by Euclid himself, but were the work of earlier Greek mathematicians such as Pythagoras (and his school), Hippocrates of Chios, Theaetetus, and Eudoxus of Cnidos. 
  However, Euclid is generally credited with arranging these theorems in a logical manner, so as to demonstrate (admittedly, not always with the rigour demanded by modern mathematics) that they necessarily follow from five simple axioms. 
 farside.ph.utexas.edu /euclid.html (451 words) 
