'Wolfman' returns

Explorer Jim McNeill tracks down Arctic wolves

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Poetry or science?

Is romantic love just a chemical cocktail?

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China alert over bird flu death

Chinese authorities shut down and clean poultry markets in Hebei province, after the first human death in nearly a year.

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Panda bites his third tourist in two years at Beijing zoo

A panda at Beijing zoo bites a man for the third time in two years.

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A deep-sea fish caught in the Pacific has mirrors for eyes

A deep-sea fish caught in the Pacific has eyes which use mirrors as well as lenses, scientists discover.

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Venomous mammal caught on camera

Rare footage of one of the world's most strange and elusive mammals is captured by scientists.

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Beagle hunter

On a mission to find the most famous ship of science

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Our writers talk back

Some of the previous contributors to the Green Room respond to readers' questions and comments.

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Baby Jupiter's huge weight gain

The planet Jupiter must have gained mass fast during its infancy, according to astronomers.

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Tech fair offers greener vision

Analysts at the Consumer Electronics Show say green credentials of tech products will become critical to success.

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Feilden's blog

Ground-breaking new technique in stem cell science

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Earth Watch

Why it is hard to predict sudden environmental crises

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Everest trip helps critically ill

Blood oxygen levels recorded on a trip by medics to Everest could help the treatment of critically ill patients.

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Black holes 'preceded galaxies'

Astronomers believe they have solved a cosmic chicken-and-egg question: what came first - black holes or galaxies?

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First flight of algae-fuelled jet

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Body repair 'could be ramped up'

A combination of drugs could trick the body into sending its repair mechanisms into overdrive, say scientists.

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Eat it or lose it - why centuries of crop diversity are at risk

Centuries of crop diversity are at risk of being lost forever as farmers turn to just a few modern, high yielding varieties.

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Zimbabwe troops 'eat elephants'

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Holes give edge to new armour

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Canadians claim South Pole record

A trio of Canadians claim a new record for the fastest trek across Antarctica to the South Pole.

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US vows 'huge' marine protection

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Mosquitoes make sweet love music

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Animal matters

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Mummy of female pharaoh uncovered

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Heat may spark world food crisis

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 Science > Combinatorics

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Science > Combinatorics

Combinatorics:

Algebraic Combinatorics via Finite Group Actions

A hypertext by A. Betten, H. Fripertinger and A. Kerber.

http://www.mathe2.uni-bayreuth.de/frib/html/book/hyl00.html

ArXiv Front: CO Combinatorics

Combinatorics section of the Front for the Mathematics ArXiv.

http://front.math.ucdavis.edu/math.CO

Catalogue of Lattices

A catalogue of different types with applications to packing spheres by Neil Sloane and Gabriele Nebe.

http://www.research.att.com/~njas/lattices/

Graand

Free Classified Ads Portal

www.graand.com

CATS: Combinatorial Algorithms Test Sets

Searchable index of problems, links and methodology maintained by the Association for Computing Machinery.

http://www.jea.acm.org/CATS/

Combinatorial Catalogues

Combinatorial objects such as graphs, designs and geometries collected by Gordon Royle.

http://www.csse.uwa.edu.au/~gordon/data.html

Combinatorial Data

Brendan McKay's collection of miscellaneous tables in graph6 or sparse6 format.

http://cs.anu.edu.au/~bdm/data/

The Combinatorial Object Server

Select a type together with specific parameter values and COS will return a list of all such combinatorial objects.

http://www.theory.csc.uvic.ca/~cos/

Combinatorics

Subfields in the AMS MSC 2000 classification 05.

http://www.ams.org/msc/05-xx.html

Combinatorics

MathWorld article with basic definitions and links.

http://mathworld.wolfram.com/Combinatorics.html

The Combinatorics Net

Maintained by Bill Chen.

http://www.combinatorics.net/

Combinatorics

An article on counting Young tableaux of bounded height by François Bergeron and Francis Gascon.

http://bergeron.math.uqam.ca/Bessel/bessel.html

The Cutting Sticks Problem

An unsolved combinatorial problem by Frans Faase.

http://www.iwriteiam.nl/cutsticks.html

Encyclopedia of Combinatorial Structures

Searchable database of structures with specifications and counts.

http://algo.inria.fr/encyclopedia/

Enumeration of Polyhedra

Enumeration of polyhedra with upto 9 faces by Steven Dutch.

http://www.uwgb.edu/dutchs/symmetry/polynum0.htm

Enumeration of the Binary Trees

A note on Catalan numbers by Ivan Galkin.

http://ulcar.uml.edu/~iag/CS/Catalan.html

Extremal Combinatorics

With Applications in Computer Science by Stasys Jukna.

http://www.thi.informatik.uni-frankfurt.de/~jukna/EC_Book/

Generating Functions

Introduction to generating functions with interactive java applets by Alexander Bogomolny.

http://www.cut-the-knot.org/blue/GeneratingFunctions.shtml

G-Systems

Theory of chord structures to create music through algorithms by Vladimir Ladma.

http://www.sweb.cz/vladimir_ladma/english/music/articles/dide99.htm

Lectures in Combinatorics

An introduction to partially ordered sets, Dilworth's theorem, lattices and combinatorial geometries.

http://www.freewebs.com/desargues/combinatorics.htm

The Math Forum Math Library - Combinatorics

Comprehensive catalog of websites relating to Combinatorics.

http://mathforum.org/library/topics/combinatorics/

A New Proof of the Four Colour Theorem

By Ashay Dharwadker. Includes profile, research papers for other algorithms, lecture notes, and student database.

http://www.geocities.com/dharwadker/

On-line Dictionary of Combinatorics

An expanding web text by Joe Fields.

http://www.southernct.edu/~fields/comb_dic/

Polya's Enumeration Theorem

An article on generating functions and Polya's theory of counting by Karl Dahlke.

http://www.mathreference.com/cmb-gf,pet.html

Series Expansions

Iwan Jensen counts polyominoes (aka lattice animals), paths, and various related quantities.

http://www.ms.unimelb.edu.au/~iwan/Series.html

The Seventeen Wallpaper Groups

Examples in traditional Japanese patterns.

http://mathmuse.sci.ibaraki.ac.jp/pattrn/PatternE.html

Squared Squares

Tilings of squares and rectangles, the classical problem and variations.

http://www.squaring.net/

A Survey of Venn Diagrams

Various facts and figures about Venn diagrams by Frank Ruskey.

http://www.combinatorics.org/Surveys/ds5/VennEJC.html

Topics in Mathematics - Combinatorics

In the Mathematics Archive at University of Tennessee, Knoxville.

http://archives.math.utk.edu/topics/combinatorics.html