

Links and Online Books
Links
Online Books
Categorical Theory: 
Categories, Types and Structures:
an introduction to Category Theory for the working computer scientist.
(PostScript)
by Andrea Asperti and Giuseppe Longo, M.I.T. Press, 1991. (pp. 1300). (Available by ftp, see the book content page in Downloadable Papers). 
Basic Category Theory (AbstractPostScriptDVI)
(a publication in Basic Research in Computer Science) by Jaap van Oosten, January 1995. vi+75 pp. 
Algebra: 
Abstract Algebra On Line
A Site maintained by John Beachy 
Finite Rank Torsion Free
Modules Over Dedekind Domains
A Book by Lee Lady 
Algebraic Geometry 
Algebraic
Geometry Seminar
Algebraic Geometry A Book. by J.S.Milne 
History of Mathematics: 
History of
Mathematics archive at the School of Mathematics, Trinity College, Dublin.
Biographies of some seventeenth and eighteenth century mathematicians, taken from A short account of the history of mathematics (4th edition, 1908) by W. W. Rouse Ball. Mathematical papers and other material relating to certain mathematicians and philosophers, including Hamilton, Berkeley, Boole, Riemann, Cantor and Newton. A directory of Web sites and pages around the world relevant to the history of mathematics. 
Hermann
Grassmann and the Prehistory of Universal Algebra
Hermann Grassmann and the Creation of Linear Algebra by Desmond FearnleySander 
Research Bibliography: 
CATEGORY THEORY 
General Interests: 
Stanford
Encyclopedia of Philosophy
(Table of Contents) 