1. Complex Numbers  
   Laurie Geller, Math. Dept., University of North Dakota, Grand Forks, ND  
2. A Brief History of Complex Numbers  
   Nicholas Counsell, Math. Dept., University of Bath,U. K.  
3. Quadratic, cubic and quartic equations  
   MacTutor History Archive, Math. Dept., Univ. of St. Andrews, Scotland  
4. A quotation by Niccolo Fontana Tartaglia   
   MacTutor History Archive, Math. Dept., Univ. of St. Andrews, Scotland  
5. The fundamental theorem of algebra   
   MacTutor History Archive, Math. Dept., Univ. of St. Andrews, Scotland  
6. The Origin of Complex Numbers and the Notation "i"  
   Math. Dept., University of Toronto, Ontario, Canada  
7. Complex Numbers  
   Laurie Geller, Math. Dept., University of North Dakota, Grand Forks, ND  
8. Hamilton's theory of Conjugate Functions, or Algebraic Couples  
   David R. Wilkins, School of Mathematics, Trinity College, Dublin, Ireland  
9. Complex Numbers History PDF  
   Ernst Kani, Math. Dept., Queen's Univ., Kingston , Ontario, Canada  
10. The solution of cubic and quartic equations PDF  
    Rod Gow,  Math. Dept., University College Dublin, Ireland  
11. The Fundamental Theorem Of Algebra  
    The School of Mathematics and Statistics, The University of Sheffield, UK  
12. Cubic Equation  
    Eric Weisstein, World of Mathematics, Wolfram Res., Inc., Champaign, IL   
13. Solving the Cubic: Tartaglia   
    Library at Wolfram Res., Inc., Champaign, IL   
14. Solving the Quintic with Mathematica  
    Library Wolfram Res., Inc., Champaign, IL   
15. Quartic Equation  
    Eric Weisstein, World of Mathematics, Wolfram Res., Inc., Champaign, IL   
16. Quintic Equation  
    Eric Weisstein, World of Mathematics, Wolfram Res., Inc., Champaign, IL   
17. Jean Le Rond d'Alembert  
    MacTutor History Archive, Math. Dept., Univ. of St. Andrews, Scotland  
18. Jean Robert Argand  
    MacTutor History Archive, Math. Dept., Univ. of St. Andrews, Scotland  
19. Rafael Bombelli  
    MacTutor History Archive, Math. Dept., Univ. of St. Andrews, Scotland  
20. Girolamo Cardano  
    MacTutor History Archive, Math. Dept., Univ. of St. Andrews, Scotland  
21. Augustin Louis Cauchy  
    MacTutor History Archive, Math. Dept., Univ. of St. Andrews, Scotland  
22. René Descartes  
    MacTutor History Archive, Math. Dept., Univ. of St. Andrews, Scotland  
23. Leonhard Euler
    MacTutor History Archive, Math. Dept., Univ. of St. Andrews, Scotland  
24. Johann Carl Friedrich Gauss  
    MacTutor History Archive, Math. Dept., Univ. of St. Andrews, Scotland  
25. Georg Friedrich Bernhard Riemann  
    MacTutor History Archive, Math. Dept., Univ. of St. Andrews, Scotland  
26. Nicolo Fontana Tartaglia  
    MacTutor History Archive, Math. Dept., Univ. of St. Andrews, Scotland  
27. John Wallis  
    MacTutor History Archive, Math. Dept., Univ. of St. Andrews, Scotland  
28. Karl Theodor Wilhelm Weierstrass  
    MacTutor History Archive, Math. Dept., Univ. of St. Andrews, Scotland  
29. Hamilton's Research on Quaternions  
    David R. Wilkins, School of Mathematics, Trinity College, Dublin, Ireland  
30. Letters describing the Discovery of Quaternions  
    David R. Wilkins, School of Mathematics, Trinity College, Dublin, Ireland  

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(c) John H. Mathews 2003