Galois Theory - http://www.wra1th.plus.com/Galois/ Lecture notes and glossary, by Gavin Wraith.
The Solution to the Quartic Equation - http://members.tripod.com/l_ferrari/quartic_equation.htm This site has the general algebraic solution to the quartic equation. It also has an example on how to solve the equation that Lodovico Ferrari solved (Ferrari discovered the solution).
Solving the Quintic with Mathematica - http://library.wolfram.com/examples/quintic/ Methods to solve algebraically several quintic equations. Though quintics cannot generally be solved in terms of finite sums of radicals, they can be solved as infinite series, for example. (Designed as an "on-line poster.")
Field Theory -- from MathWorld - http://mathworld.wolfram.com/topics/FieldTheory.html Directory of articles on Field Theory.
Solving the Quintic by Iteration - http://math.dartmouth.edu/~doyle/docs/icos/icos/icos.html Peter Doyle and Curt McMullen. Web text chatracterising equations that can be solved using iterated rational maps: the Galois group must be within A5 of soluble.
The Valuation Theory Home Page - http://math.usask.ca/fvk/Valth.html A forum for all mathematicians who work in or use valuation theory. Directory of people, meetings, preprints, bibliography, open problems and news.
Field Theory and Polynomials - http://www.math.niu.edu/~rusin/known-math/index/12-XX.html Section 12 of the Mathematical Atlas by Dave Rusin.
Math Forum - Fields - http://mathforum.org/library/topics/fields/ A catalogue of Web sites and Web pages relating to Fields.
Galois Field Package - http://infoshako.sk.tsukuba.ac.jp/jcca/GaloisField/ Allows the use of many Mathematica functions over finite fields without any modification; e.g solving linear equations, inverses, determinants, derivations, resultants. By Ryoh Fuji-Hara, University of Tsukuba. Package and documentation are available for download.
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