Democritus Article by J.J. O'Connor and E.F. Robertson, from the MacTutor History of Mathematics Archive. Emphasizes this philosopher's work in physics and geometry. http://www-gap.dcs.st-and.ac.uk/~history/Mathematicians/Democritus.html Top/Society/Philosophy/Philosophers/D/Democritus
Pierre Duhem Biography with extensive bibliography, from the MacTutor History of Mathematics. Compiled by J.J. O'Connor and E.F. Robertson. http://www-gap.dcs.st-and.ac.uk/~history/Mathematicians/Duhem.html Top/Society/Philosophy/Philosophers/D/Duhem,_Pierre
Hippias of Elis Concise scholarly biography of this discoverer of the quadratrix, from the MacTutor History of Mathematics. http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Hippias.html Top/Society/Philosophy/Philosophers/H/Hippias