Algebraic Geometry
Events, People, Publications, Research Groups, Software, AGATHOS - Algebraic Geometry: A Total Hypertext On, Algebraic Curves, Algebraic Curves, Algebraic Geometry, Algebraic Geometry Notebooks for Non-Experts, Differential Algebraic Geometry - A Scheme-theoret, Introduction to Algebraic Geometry, Noncommutative Geometry and Algebra, Projections of Complex Algebraic Curves to Real 3-, The Brill-Noether Project
Computational Geometry
Events, Publications, Software, Application Challenges to Computational Geometry -, ArXiv: cs.CG Computational Geometry, Center for Geometric and Biological Computing, Duk, Center for Geometric Computing, Brown University, Compgeom Mailing Lists, Compgeom Mailing Lists Archive, Computational Geometry by Godfried Toussaint, Computational Geometry Pages, Computational Geometry Resources, Ear Cutting for Simple Polygons
Differential Geometry
Research Groups, Alfred Gray Differental Geometry, ArXiv Front: DG Differential Geometry, Classical Curve Theory and Frenet Equations, Differential Geometry, Differential Geometry Page, Differential topology, Finite Canonical Commutation Relations, John Oprea's Home Page, Non-Commutative Geometry, Riemannian Geometry
Events
Past Events, Geometry: Interactions with Algebra and Analysis, London Topology and Geometry Seminar, Moduli Spaces of Properly Embedded Minimal Surface, Noncommutative Geometry, Pacific Northwest Geometry Seminar
Higher Dimensional
Four-Space Visualization of 4D Objects, Fourth Dimension: Tetraspace, Fun with Hyperspace, Hyper Dimensia, HyperCube by Harmen, Hypercube's homepage, Miscellaneous Mathematical Musings, The 4D Web Page, The 4th Dimension, Thinking 4-d
Non-Euclidean
Book List on Non-Euclidean Geometry, Euclidean and Non-Euclidean Geometry with The Geom, Minkowskian geometry and quaternion algebras, Non-Euclidean Geometry, Non-Euclidean Geometry, Non-Euclidean Geometry - Mathematics and the Liber, Non-Euclidean Geometry by H.S.M. Coxeter, Non-Euclidean Geometry with LOGO, NonEuclid - Hyperbolic Geometry Article + Software, References for Non-Euclidean Geometry
Open Problems
Open Problems, Open Problems from the Geometry Junkyard, Open Problems on Discrete and Computational Geomet, Steiner Trees, The Open Problems Project
People
Historical, Anderson, Jim, Ballmann, Werner, Banchoff, Tom, Bestvina, Mladen, Calegari, Danny, Chang, Sun-Yung Alice, Cherowitzo, Bill, DeLaVina, Ermelinda, Dodson, C.T.J. (Kit), Doran, Charles
Plane Geometry
Lessons on Perimeter and Area of Polygons from Mat, Occurrence of the Conics, Polygons, Pythagorean Theorem, Tim's Triangular Page, Xah: Visual Dictionary of Special Plane Curves
Polytopes
Higher Dimensional, Polyhedra, Software, Guy's Polyhedra Pages, Numericana - Polyhedra & Polytopes, Polygons, Polyhedra, Polytopes, Polyhedra, Platonic Solids, Polytopes, Regular Polytopes, The Charged Particles Model, The Geometry Junkyard, The Mathematical Atlas - Polytopes and Polyhedra, Zome Edu
Projective
An Introduction to Projective Geometry (for Comput, Important Concepts from Projective Geometry, Lecture Notes on Projective Geometry, Linear Systems of Conics, MathWorld, Projective Geometry, Projective Geometry for Multiple View Analysis, Projective Geometry Resources, Wilson Stothers' Cabri and Conics Pages
Publications
Books, Journals, ArXiv Front: MG Metric Geometry, ArXiv Front: SG Symplectic Geometry
Research Groups
(Australia) University of Adelaide, (Austria) Vienna University of Technology, (Hungary) Eötvös Loránd University, Budapest, (Netherlands) Radboud University Nijmegen, (Russia) Moscow University, (Slovak Republic) Comenius University, Bratislava, (Spain) University of Valencia, (UK) University of Bath, (UK) University of Cambridge, (UK) University of Warwick
Sculpture and Art
Art Geometry and Abstract Culture, Geometric Sculpture of George W. Hart, GeomeTricks, Geometry Gallery, Islamic and Geometric Art, Ken Snelson, Math Art Gallery, Math Art Project 1999, Mathematics and Art Project, Polyhedra and other Interesting Structures
Software
Atomic Concepts Software, C.a.R. Geometry Program, Cabri Geometry, Cabri Java beta version, Cinderella: Interactive Geometry, Dave Wilson's Poincaré Notes, Descriptive Geometry, Edu2000's Visual Geometry Series, GANG Software Suite, Geometria
A Gallery of Interactive On-Line Geometry
At the Geometry Center.
A New Way to Calculate a Triangle's Area
Using the length of the three sides. The proof is better understood than the old one.
Allexperts Geometry Q&A
Volunteer tutors help you work through your geometry problems for free.
Bette Veteto's Homepage
History of Mathematics, very strong on geometry.
Bob's Pages
A collection of interactive geometry applets. Topics include polyhedra, Poncelet's porism, Soddy's hexlet, Mandelbrot set, Steiner porism, Pappus's chain, Repulsion polyhedra and stereo pictures.
Center of Points in 2- or Higher-dimensional Space
It provides important formulations for finding a center of points in 2 or higher dimensional space. It can be used in drawing delauney triagulation and voronoi diagram in two or higher dimensions. It also describes how many points are required in defining a center in n-dimensional space.
Conjectures Produced by the Program Graffiti
Graffiti is a computer program that makes conjectures in mathematics and chemistry. Links to the conjectures and bibliography.
Cuboid and Cube Surface Distances
A java applet with substantial analysis related to distances on a rectangular box.
Diamond Theory
Plato tells how Socrates helped Meno's slave boy "remember" the geometry of a diamond. Twenty-four centuries later, this geometry has a new theorem.
Encyclopedia of Triangle Centers
By Clark Kimberling. Over 1000 triangle centres in a searchable compilation with diagrams.
Erich's Packing Center
Graphics and links for various packing, tiling and covering problems.
Fundamentals of Geometry
Free online book on geometry in pdf format. Contains material not easily found elsewhere from detailed exposition of elementary absolute geometry based on Hilbert's axioms to more advanced topics.
Geometric Group Theory
Information and resources about geometric group theory and low-dimensional topology. People, groups, meetings, links.
Geometry and the Imagination in Minneapolis
Geometry exercises for a two-week summer workshop led by John Conway, Peter Doyle, Jane Gilman and Bill Thurston at the Geometry Center in Minneapolis, June 1991.
Geometry Center
Web site for the (now closed) Center for the Computation and Visualization of Geometric Structures at the University of Minnesota. Graphics, multimedia, software, teaching resources.
Geometry Formulas and Facts
Excerpts from the 30th Edition of the CRC Standard Mathematical Tables and Formulas (1995), namely, the geometry section minus differential geometry.
Geometry from the Land of the Incas
Presents problems involving circles and triangles, with proofs, SAT practice quizzes and famous quotes. Also, has examples of geometry in Peruvian culture.
Geometry in Action
Includes collections from various areas in which ideas from discrete and computational geometry meet real world applications.
Geometry Page from Interactive Mathematics Miscell
Includes articles on topics in elementary and not so elementary geometry, many with interactive Java illustrations and multiple proofs.
GLaD Comments
A new type of geometric construction that was discovered by Dan Litchfield and David Goldenheim. Includes general explanation and sketch examples.
Math 3210 - Higher Geometry I
Course notes by Bill Cherowitzo.
Math Forum: Geometry POW/POM Search
Search the Geometry Problem of the Week's archive of creative, non-routine challenges, as well as submissions and commentary, dating back to 1993.
Math Forum: geometry-research
Geometry professors and instructors may keep informed of the latest research conducted in their field at the geometry-research discussion list.
Math Forum: Search geometry-forum
Those interested in examining the previous incarnation of the Math Forum may search the archives of the Geometry Forum.
Mathematical Curves and Surfaces
Graphical representations of computer generated forms. (French/English).
Mathematical Surfaces
A collection of parametric and implicit equations.
Morley's Miracle
A discussion of Morley's famous theorem and the research of which it was a tiny part. 5 proofs are given including J. Conway's, D. Newman's, and A. Connes'.
NPR : Mathematicians Get Crafty with Geometry
A husband and wife from Cornell University have come up with a crafty way to illustrate high-level geometry concepts -- by manipulating yarn into models that help explain the curvature of spaces. The mathemeticians talk with NPR's Jacki Lyden about hyperbolic crocheting. [4:47 streaming audio broadcast]
Packomania
Includes packings of equal objects in containers together with source codes to obtain them numerically.
Paul Bourke's Geometry Page
Includes formulas, definitions and three dimensional image illustrations.
Problem of the Minimum Rotation Surface
Java applet demonstrating the catenary.
Steiner Surfaces
Mathematical descriptions and ray-traced images of various types of Steiner surfaces
The Entropy Reduction Laboratory by Karl-Dietrich
Discusses double shell structured periodic systems, platonic spheres, molecular and crystal structures, and FlashSort algorithms.
The Geometry Junkyard
Usenet clippings, web pointers, lecture notes, research excerpts, papers, abstracts, programs, problems, and other stuff related to discrete and computational geometry.
The Kepler Conjecture
Information on the recent proof of Kepler conjecture on sphere packings.
Tim Lister's Hyperbolic Geometry
Cabri constructions for the demonstration of the basic concepts of hyperbolic geometry in the Poincare disc model.
Wilson Stothers' Inversive Geometry and Cabri
Includes Steiner's Porism and the arbelos.
Xah's Personal Page
Features an illustrated dictionary of special plane curves, a paper on wallpaper groups, mathematics image gallery and links to software packages.