 Felix Klein's Geometric Abstraction by Groups  Bill Hammel
Some notes on a most general definition of "geometry," first elucidated by Felix Klein, which is based on a set of geometric invariants under a group of transformations.
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 Fine Structure Constant, alpha  James G. Gilson
Solution to a 20th century mystery: Feynman's conjecture of a relation between alpha, the fine structure constant, and pi. Includes the formula for alpha and some of its consequences.
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 Foundations of Computational Mathematics
The FoCM's primary aim is to further the understanding of the deep relationships between mathematical analysis, topology, geometry and algebra and the computational process as they are evolving together with the modern computer. The meetings are unified
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 Fundamentals of Geometry  Oleg A. Belyaev
A work in progress to create a free online book on geometryfrom exposition of elementary absolute geometry based on Hilbert's axioms to more advanced topics. The site contains a current draft of the book. This text is also intended to provide math background
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 Gallica  Bibliothèque nationale de France
Une sélection de documents numérisés qui montrent la diversité des collections manuscrites de la Bibliothèque nationale de France: les oeuvres de Joseph Liouville, Augustin Cauchy, Joseph Fourier, Henri Poincaré, Janos
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 gamepuzzles: for the joy of thinking  Kadon Enterprises, Inc.
Board games and the like: Combinatorial puzzles, tessellations, math manipulatives for all grades. Handson sets and some online exemplars of polyominoes, polyforms, color tilings. Source for classics like Archimedes' Square (Stomachion), Penrose tiles,
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 GeoGebra Central  Guillermo Bautista
A collection of GeoGebra applets dating back to August, 2010: "Systems of Linear Equations," "The Angle Trisector," "Approximating Pi," "Area of a Trapezoid," "Four Leaf Petal," "Polygons with Equal Area," "Tracing the Derivative," "Paper Folding: Locating
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 GeoGebra Wiki  Linda FahlbergStojanovska
On this Wikispaces platform, users can quickly upload GeoGebra worksheets, insert screenshot images using Jing (freeware), and post equations created with Sitmo (freeware). Resources available on the site include: GeoGebra constructions, explorations,
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 GeoLib: C++ and C# Computational Geometry Library  Matthew Minor, GeoLib
C++ and C# library with help and explanations for all agorithms and concepts used. Demo versions available.
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 The Geometer's Sketchpad: Classroom Resources on the Web  Math Forum
A page of links to dynamic interactive geometry resources for Sketchpad. GSP at Key Curriculum Press; classroom introductions and tutorials; courses, classroom materials, and student work; and general information. See also Sketchpad Resources at the Math
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 The Geometer's Sketchpad: Classroom Resources  The Math Forum
Sketchpad and JavaSketchpad dynamic interactive geometry resources on the Math Forum Site: sketches, activities, and tours; MAA meetings and groups with presentations and sample sketches; Forum Sketchpad Web Units (Algebra & Calculus; Vectors; Morphing
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 Geometer's Sketchpad: Introductory Lab  Mike Riedy
A beginning tutorial, with worksheets, for using GSP. Lab is organized into five parts: Preliminary Setup (formatting a disk, starting and quitting the Geometer's Sketchpad, making mistakes); Toolbox (introduction to the GSP tools: circle, select, point,
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 Geometria descrittiva e modellazione 3d  Hasan Isawi
In Italian: Questo Sito vuole affrontare quella parte teorica della geometria
descrittiva tenendo conto della potenzialità degli odierni strumenti della
computer grafica.
Ovvero, in considerazione del fatto che una volta completata la costruzione
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 Geometrica: a Mathematica package for Geometry  eNoteBooks Ltd.
Used by mathematics educators, researchers, and graphical designers,
Geometrica is a Mathematica application for exact drawing and geometry. With
it, you can draw points, lines, circles, ellipses, parabolas, hyperbolas,
and more, as well as determine
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 Geometric Loci
Pictures and animations of mathematical curiosities. Posts, which date back to January, 2014, have included Reuben Thomas iris, the trammel of Archimedes, Möbius hanger, polyhedron drilled pentagonal rotunda, and il triangulo Sierpinski secondo Dimitri.
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 GeometriX  Benko Computer Software Ltd., Turkey
Windowsbased geometric drawing, presentation, and testing system for primary to high schools. Make worksheets using the commercial software, and your students can view them on their computers or on the web using the free viewer software. Trial version
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 Geometry and Topology Journal  Mathematics Institute, University of Warwick
A fully refereed international journal, published in free electronic format and a paper version, dealing with all aspects of geometry and topology and their applications. The site offers main journal papers (in PostScript and PDF formats), research monographs,
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 geometryannouncements  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup, for information about lectures, announcements, special meetings, and upcoming events concerning geometry. Read and search archived messages; and register to
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 geometrycollege  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup, for discussions of topics covered in college geometry, problems appropriate for that level, and geometry education. Read and search archived messages; and
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 Geometry Discussion Groups  Math Forum
A gateway to the archives of the Math Forum's online electronic community comprising eight geometry discussion groups for all those interested in geometry. Access current news or follow a link to threaded past discussions to browse or search the archive
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 Geometry Forum Articles  The Geometry Center
Articles on mathematical topics and about the Geometry Center by the Center's mathematics writers Evelyn Sander and Bob Hesse, originally posted on newsgroups hosted by the Geometry Forum (now the Math Forum). Articles are collected under the following
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 Geometry  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
More than 95 games or puzzles having to do with geometry, chaos, fractals, and topology with extensive discussions and solutions. Most require a browser capable of displaying JavaScript or Java.
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 Geometry.Net
An online learning center offering extensive lists of links to sites with material in Basic Math; Pure and Applied Math; Computer & Internet; Technology; Biographers; Physics; Biology; and Sports.
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 Geometry Playground  Exploratorium
An exhibit from San Francisco's Exploratorium. Peoplesized exhibits let you use your hands, brain, and body to play with physical demonstrations of geometry concepts. Exhibits fall under the categories of seeing, moving, and fitting things together,
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 geometryresearch  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup, for research announcements, seminars, reviews, and abstracts of papers and discussions of same, and ideas for research. Read and search archived messages;
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 geometrysoftwaredynamic  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup. This group focuses on discussion of such geometry software programs as The Geometer's Sketchpad and Cabri Geometry II. Read and search archived messages; and
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 Geometry Turned On: Dynamic Software in Learning, Teaching, and Research  J. King and D. Schattschneider, Editors
This book contains twentysix papers about aspects of dynamic software for geometry. The book does not contain software itself, but this site includes downloadable files for many of the papers in the book. For a discussion of what the book is about, see
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 Geomview: 3D Visualization Software  The Geometry Center
An interactive program written by the staff of the Geometry Center for viewing and manipulating geometric objects. It can be used as a standalone viewer for static objects or as a display engine for other programs that produce dynamically changing geometry.
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 George Washington: Surveyor and Mapmaker  Library of Congress
An essay on George Washington's lifelong association with geography and cartography, "Tracing the Maps in George Washington's Life" contains the chapters Washington as Public Land Surveyor  Boyhood and Beginnings; Washington as Public Land Surveyor 
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 Glossary  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A glossary of terms that also serves as an alphabetical index to Bogomolny's site. Each term is linked to an illustrated essay.
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 Grafica Obscura  Paul Haeberli
An evolving computer graphics notebook: a compilation of technical notes, pictures and essays. Contents include: Paper and Plotter: A 3D Surface; Laser Cutting for Rapid Manufacturing; Geometric Paper Folding: Dr. David Huffman; Paper and Light (An inexpensive
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 Graphics Archive  The Geometry Center
General interest images of an artistic nature, or of general interest to the public, including fractals, digital art, etc.; Special Topics  images created during research projects at the Geometry Center; Video Productions  images from videos produced
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 Graphing Calculator for Mac and Windows  Pacific Tech
Graphing Calculator calculates and displays two and threedimensional mathematical objects easily, and saves animations as QuickTime movies. The site includes a list of features, a guided tour, a picture gallery, a free demo, and ordering capabilities,
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 Graphmatica  Keith Hertzer, kSoft, Inc.
An equation plotter with numerical and calculus features. Graph Cartesian functions, relations, and inequalities, plus polar, parametric, and ordinary differential equations. Up to 25 graphs on screen at once. Offers copy to clipboard (bitmap and WMF),
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 Hacktastic  Laura Taalman
Blog about "design, mathematics, and failure" by Taalman, a professor of mathematics at James Madison University, as she learns JavaScript, three.js, and WebGL. Posts, which date back to October, 2014, have included "Menger Menagerie," "Trigonometry Style,"
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 HAKMEM  Beeler, Gosper, Schroeppel; Artificial Intelligence Laboratory, MIT
A list of math and computerrelated problems, unsolved in 1972 when the list originated, compiled "with the hope that a record of the random things people do around here can save some duplication of effort  except for fun." Topics include: Geometry,
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 Handheld Geometry  Nevil Hopley
A dynamic geometry site offering lessons and challenges for handheld devices and graphing calculators, including the Cabri™ Jr. Application for the Texas Instruments TI83+ and TI84+, and the TINspire™. The author offers to make users' contributions
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 Handheld Software Applications  Texas Instruments, Inc.
Software applications and programs made available for downloading as a noncommercial service to benefit TI graphing calculator owners. Programs are offered for each of Texas Instruments' graphing calculators, CBL, and CBR, as well as calculator program
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 Hedgehog  a Java Mathematical and Geometry API  Hedgehog Software
The Hedgehog Java API is tailored for mathematical and 2D/3D geometric modelling. Written in 100% Java it supports numerous mathematical packages and 2D and 3D geometric objects. Imports/exports are supported in XML, X3D and HSQLDB database formats.
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 Henry Segerman's webpages  Henry Segerman
Mathematical and typographical art "of various kinds and dimensions." See, in particular, Segerman's 3D printed sculpture, book covers and posters, diamond Go, ambigrams, autologlyphs, autological words, Escher's Printgallery, and mathart tshirts available
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 Homepage of Torsten Sillke  Torsten Sillke
A collection of puzzles statements, with references, on a variety of topics: operations research, such as crossing the bridge; logic, including liars and truth tellers, mastermind, and age problems; lateral thinking, also known as "situation puzzles";
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 How to Knit a Moebius Band (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
Directions for using two colors to knit a band that can be cut apart into a Moebius strip, expanded by Maria IanoFletcher from an original recipe by Miles Reid.
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 iFD Bundle  iFD Software Consult
Five mathematical products for Pocket PC and Windows in one software package: iFD Geometry, iFD Graph, iFD Calc, iFD Formula, and iFD unit converter. All products available separately as well, in addition to other software applications.
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 Index Using Mathematics Subject Classification (MSC)  Dave Rusin; The Mathematical Atlas
The index pages at this site are organized according to the Mathematics Subject Classification (MSC) scheme. (This is the scheme developed by the American Mathematical Society and Zentralblatt für Mathematik.) General headings include Foundations;
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 Interactive Geometry Classroom Resources  CIGS, Math Forum
Links to downloads and classroom resources for dynamic geometry programs: the Geometer's Sketchpad; Cabri Geometry; Cinderellas Café (Java geometry software  German); Dr Geo (multilingual software for IBM PC); Euklid (Windows shareware in German
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 International Conference on Technology in Collegiate Mathematics (ICTCM) (Mathematics Archives)  Przemyslaw Bogacki, Managing Editor
Home site of the Electronic Proceedings of the International Conference on
Technology in Collegiate Mathematics (EPICTCM), an annual conference sponsored by AddisonWesley (on this site are conferences from 19941998). Papers are presented through an
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 Introduction to Math and Spreadsheets  Jan Garner
Exercises on spreadsheets. Using ClarisWorks, graph a spiral or a few parabolas; build a scale model of the Great Pyramid or find the biggest box you can make from a sheet of cardboard; plan the budget for a picnic.
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 Inventing Science: From Thales to Euclid  Gregory Crane, Tufts University
Classics 189: Greek Science. Euclid's synthesis remains the most successful single book on math every written, but advances were made in many other fields such as geography, astronomy and the natural sciences. Aristotle, in particular, laid the foundations
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 Is Mathematical Teaching a Function of Time?  Andrej and Elena Cherkaev, eds.
A page of math humor, including definitions, anecdotes, math education jokes, theorems, puns, limerics, and links.
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 JavaSketchpad: Dynamic Geometry for the Internet  Key Curriculum Press
The Developer Release and Alpha Test Center (DR2) of the JavaSketchpad applet and Sketchpad HTML Converter. You will need the first component in order to drive any Web pages you publish that contain dynamic geometry sketches; you'll need the second component
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