===== Some online resources about mathematical structures =====

Please add links to other resources that you are aware of.

**Encyclopedic resources:**
[[http://www.research.att.com/~njas/sequences/Seis.html|On-Line Encyclopedia of Integer Sequences]] |
[[http://planetmath.org/|PlanetMath.org]] |
[[http://mathworld.wolfram.com/|Eric Weisstein's World of Mathematics]] |
[[http://www.wikipedia.org/|Wikipedia]]

**Other online resources:**
  *[[http://arXiv.org|arXiv.org e-Print archive]]
  *[[http://citeseer.nj.nec.com/cs|Citeseer: Scientific Literature Digital Library]]
  *[[http://spot.colorado.edu/~kearnes/ua.html|Keith Kearnes, General Algebra and Lattice Theory]] Conferences, contact researcher, mailing list, bibliography,...
  *[[http://turnbull.mcs.st-and.ac.uk/history/|MacTutor History of Mathematics archive]] Biographies of mathematicians, index of famous curves, ...
  *[[http://www.ams.org/mathscinet|MathSciNet]] Mathematical reviews (requires subscription)
  *[[http://www2.cs.unibw.de/Proj/relmics/html/|RelMiCS: Relational Methods in Computer Science]] Conferences, tools, mailing list, bibliography,...
  *[[http://www.wikibooks.org/|WikiBooks]] Free open content textbooks and other classroom texts
  *[[http://www.emis.de/ZMATH/|Zentralblatt MATH]] Reviews of mathematical papers (free queries for $\le 3$ reviews)

**Books and surveys available online (see also http://www.ams.org/online_bks/online-books-web.html):**
  *Michael Barr and Charles Wells [[ftp://ftp.math.mcgill.ca/pub/barr/ttt/tttpdf.zip|Triples, Toposes and Theories]]
  *Wim Blok and Bjarni Jónsson [[http://math.nmsu.edu/~holsymp/lectures.html|Algebraic structures for logic (Lecture notes)]]
  *Peter Burmeister [[http://www.mathematik.tu-darmstadt.de/Math-Net/Lehrveranstaltungen/Lehrmaterial/SS2002/AllgemeineAlgebra/download/LNPartAlg.pdf|Lecture Notes on Universal Algebra: Many-sorted partial algebras]]
  *Peter Burmeister [[http://www.mathematik.tu-darmstadt.de/Math-Net/Lehrveranstaltungen/Lehrmaterial/SS2002/AllgemeineAlgebra/download/pa86.pdf|A Model Theoretic Oriented Approach to Partial Algebras]]
  *Stanley Burris and H.P. Sankappanavar [[http://www.thoralf.uwaterloo.ca/htdocs/ualg.html|A Course in Universal Algebra]]
  *Ralph Freese and Ralph McKenzie [[http://www.math.hawaii.edu/~ralph/Commutator/|Commutator Theory for Congruence Modular Varieties]]
  *Mai Gehrke and Bjarni Jónsson [[http://www.math.nmsu.edu/mgehrke/dle060601.pdf|Bounded Distributive Lattice Expansions]]
  *Rob Goldblatt [[http://www3.oup.co.uk/igpl/Volume_08/Issue_04/#Goldblatt|Algebraic Polymodal Logic: A Survey]]
  *David Hobby and Ralph McKenzie [[http://www.ams.org/online_bks/conm76/|The structure of finite algebras]]
  *George Hutchinson [[http://www.math.u-szeged.hu/~czedli/hutchinson/|Lattices and Categories of Modules]] [[http://www.math.u-szeged.hu/~czedli/hutchinson/|Lattice theory equations and interesting lattices]]
  *Peter Jipsen and Henry Rose [[http://www.chapman.edu/~jipsen/JipsenRoseVoL.html|Varieties of Lattices]]
  *Keith Kearnes and Emil Kiss [[http://spot.colorado.edu/~kearnes/Papers/cong.pdf|The Shape of Congruence Lattices]]
  *Olga Kharlampovich and Mark Sapir [[http://atlas.math.vanderbilt.edu/~msapir/ftp/pub/survey/survey.ps|Algorithmic problems in varieties]]
  *Don Monk [[http://www.colorado.edu/math/courses/monkd/|An introduction to cylindric set algebras]]
  *JB Nation [[http://www.math.hawaii.edu/~jb/lat1-6.pdf|Notes on Lattice Theory Chapters 1-6]] [[http://www.math.hawaii.edu/~jb/lat7-12.pdf|Chapters 7-12]]
  *Herbert Wilf [[http://www.cis.upenn.edu/%7Ewilf/AlgComp2.html|Algorithms and Complexity]]