 The Internet Mathematics Challenge  Julie Houston and David Trask
Explore the geometry of architecture, and share your observations with the students who built this site. With a Javaenabled browser, mouse over pictures of buildings to find the angles, arches, and other geometric figures appearing in Durham Cathedral,
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 Introduction à la géométrie absolue avec CabriJava  Yves Martin
Pages on the Bachmann' axiomatic with dynamic (CabriJava) examples in the
hyperbolic or elliptic plane.
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 Introduction à l'algèbre  Gilles G. Jobin, Projet Diderot
An interactive course, with extensive use of the Geometer's Sketchpad. Sommaire: Introduction générale; Conseils techniques; Test diagnostique (En chantier); Définitions et vocabulaire; Représentation sur la droite numérique;
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 Introduction to Probability  Grinstead, Snell; American Mathematical Society
A text for a first course in probability that emphasizes the use of computing to simulate experiments and make computations. Read it on the Web or download it. A set of programs (Mathematica, Maple, TrueBASIC versions can be downloaded) goes with the
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 Introductory Statistics Demonstrations  David Wallace; Ohio University
Animated problems illustrating basic statistics concepts such as Variance and Standard Deviation, ZScores, Sampling Distributions, Standard Error, Confidence Intervals, Power, and ANOVA. With a basic review of algebra and interactive problems and solutions
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 invention at play  Lemelson Center, Smithsonian National Museum of American History
Rotate and translate the tangramlike pieces of Puzzle Blocks to form the silhouettes shown; arrange the gears, springs, funnels, and other objects of Tinker Ball to divert the falling ball into the target. The Invention at Play exhibition focuses on
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 Investigating LCM and GCF Using Rods  Margo Lynn Mankus
The objective of the lesson plan Investigating LCM and GCF Using Rods is to look at the Least Common Multiple (LCM) and Greatest Common Factor (GCF) from "handson" patternbuilding to using set theory. With teachers as the intended audience, the activity
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 Investigating Linear Relationships: The Regression Line and Correlation (iMath Investigations)  Illuminations; National Council of Teachers of Mathematics (NCTM)
An online, interactive, multimedia math investigation. Interactive computerbased tools allow students the opportunity to manipulate numbers easily and investigate the relationships between data points and sets. This iMath Investigation uses an interactive
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 Invest Smart  David Leung, George Lee, and Andy Kim
Learn about the stock market and investment techniques. A Market Simulation lets classes, clubs, or individuals invest an imaginary $100,000 and track the results; includes a separate mutual funds simulation. Site also contains information about saving
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 Invitation to MasterMind  Cut the Knot!, Alexander Bogomolny, with Don Greenwell
Mastermind is a game played by a codemaker and a codebreaker. The codemaker selects a code, a sequence of four colors (digits, pegs or other symbols) chosen from a set of six colors (repetitions allowed). The codebreaker will then try to guess the code.
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 iPracticeMath
Type in your responses to iPracticeMath's online multiplechoice questions, and press the orange "submit" button to check your answers: addition, subtraction, multiplication, division, algebra, "word to number" (interpreting writtenout quantities), and
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 IQFlash.com  Sergey Melnikov
Logic and math games include a variation of Nim, Rhumb Line (similar to tictactoe), and Breakfast Brainstorm (rotate the pans in order to make each of the four numbers equal 20 as soon as possible). Strategy articles include games such as tictactoe,
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 ItAllAddsUp  Council for Economic Education
Online Shockwave games and simulations for teens to learn about  and practice making decisions with  managing credit, buying a car, paying for college, budgeting, saving, investing, and more.
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 IXL Learning
IXL provides free online practice, organized by grade levels K8 and aligned to state standards. Choose one math skill from among the hundreds offered, and submit your answer. Respond incorrectly, and click on the "explanation" button to learn more; get
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 Jaap's Scratch Pad  Jaap Scherphuis
Java applets, generators, and solutions for sudoku, Rubik's Cube, "moving pieces" puzzles, permutation puzzles, and more, including sphere symmetries, polyform, Towers of Hanoi, and many lesser known puzzles from this collector. Scherphuis' articles range
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 Jacopo Notarstefano
Interactive visualizations and puzzles: "Turing's sunflower," which connects leaf arrangements and Fibonacci numbers; "HavelHakimi," which presents nodes and their degrees to construct into a graph; "Fourcoloring a Dodecahedron"; and a logic puzzle
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 Jamato: JAva MAtrix TOols  Yann Richet
A Java package designed to allow basic matrix manipulation and visualization in MATLABlike programing. Derived from the JAMA package (by the NIST and MathWorks Inc.), Jamato includes manipulation and visualization tools in addition to JAMA numeric algorithms.
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 James P. Dildine  James P. Dildine
Interactive math lessons for exploring parabolas, triangle areas, Pythagorean triples, triangle angle sums (powered by a Cabri Java applet), cancer and mathematics (image analysis, and determining the area and perimeter of nonregular figures), systems
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 James Propp
James Propp studies tilings, games, and other aspects of combinatorics, probability, and dynamical systems. Many of his articles are available for download in PostScript and gzipped PostScript formats. Code for C programs related to tilings and cellular
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 Jamit Fractions  JAMIT Software
Software for learning fractions, for students from 8 years old to adults. Topics are presented in short lessons, each with references, examples, and a practice game that generates problems to be solved. A free version is on the Web; Part One may be purchased
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 janko.at  Angela and Otto Janko
Puzzles, games, and Java applets on logic, number, and chess. See also the Jankos' Retrograde Analysis Corner and analyses of legal moves in chess.
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 Java 3d Viewer  Faceted and Wireframe Objects  Paul Flavin
A Java applet that lets you view and rotate the Platonic Solids and other faceted objects including approximations of the Moebius strip, a torus, a soccerball, a teapot and other objects. Accompanying pages describe related mathematical concepts used
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 Java Applets for Power and Sample Size  Russ Lenth, The University of Iowa
Graphical interfaces for studying the power of statistical tests: confidence intervals for one proportion or one mean, tests of one proportion or comparing two proportions, onesample ttest (or paired t), twosample ttest (pooled or Satterthwaite),
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 Java Applets for Statistics  Shangrong Deng, Kai Qian, and XuYan Chen
A collection of applets that do calculations and provide illustrations for topics in elementary statistics: the sample space model, calculator (mean and deviation), multiplication rule for counting, permutations and combinations, tossing a balanced coin
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 Java Applets  STATLETS: NWP Associates, Inc.
Links to applets for Distributions (Histograms; Normal Approximation to Binomial; Normal Density; The T Distribution; Area Under Normal Curves; Z Scores & the Normal Distribution), Probability & Stochastic Processes (Binomial Probabilities; Brownian
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 Java applets  Terence Tao, UCLA
Experimental Java applets of Besicovitch sets, conformal compactifaction, honeycombs, the complex plane, elementary complex maps, Mobius transforms, multivalued functions, the complex derivative, the complex integral, Taylor and Laurent series, the fundamental
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 Java at Xanadu  Jim Carlson, University of Utah
Applets for calculus and probability/statistics. There are calculus applets for experimenting with graphs of cubic polynomials, the arc length of graph of a cubic polynomial, and the area under the graph of a cubic polynomial. Probability and statistics
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 Java Boutique Educational Applets  internet.com Corp.
Investigate or download various Java applets, including 3D viewers, calculators, applets to graph functions or data, and simulations, such as the bell curve and fractals. The source code for many applets may also be downloaded; a few applets are shareware
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 Java Demos for Probability and Statistics  Chuck Stanton, Department of Mathematics, California State University, San Bernardino
Applets for hypergeometric distribution, Poisson distribution, normal distribution, proportions, confidence intervals for means, the central limit theorem, bivariate normal distribution, linear regression, and Buffon's needle. The introduction to probability
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 Java Examples  Richard Koch; Dept. of Mathematics, Univ. of Oregon
Fractal and FourD, two Java programs with source code and standalone versions available. "Fractal" can display various selfsimilar objects. "Four Dimensions" displays regular solids in three and fourdimensional space. The solids can be rotated and
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 Java Exploration Tool for Dynamical Systems  R. Wegenkittl and E. Gröller
A Java Applet for the visualization and exploration of twodimensional analytical defined dynamical systems. The system is defined by a set of two differential equations, which are evaluated within the chosen region to form a twodimensional vector field.
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 Java Fractals  James Henstridge
Java applets to draw different kinds of fractals: Iterated Function Systems (Sierpinski Triangle, fern, etc.), complex number fractals, and orbit fractals. Includes explanations of the algorithms used, and code for each applet.
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 JAVA Gallery of Interactive OnLine Geometry  The Geometry Center
Applets illustrating geometry concepts. WebEQ, Hyperbolic Triangles, Lorenz Simulation, OneDimensional Iteration, Tetris, Leap Fractal, Fractals from Iterated Function Systems, Kali: Wallpaper Patterns. Created by The Geometry Center.
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 Java Interactive software Visualization Environment (JIVE)  Umberto Ferraro
An interactive visualization system that can be used for teaching algorithms to several students at once. Visualization of large data sets is supported by a graphical framework based on a zoomable user interface. Animations prepared with JIVE are fully
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 Java Jive  Martin J. Chlond
A Game of NIM, Games Coins Play (NIMlike coin games), Kayles (remove coins), SpaceTime Maze (a 4D maze puzzle), Northcott's Game (played on a chessboard), Corner the Queen, CGT Chess (played on a 6by8 checkerboard), and 5 X 5 and Lights on (each
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 Java Math Class  Snorre Narum
A Java applet that renders equations or expressions in graphical form, from TeXstyle entries.
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 Java MATrix tools package
JMAT provides an easytouse class of matrix with MATLABlike functions and syntax. JMAT also includes plots and histograms in 2D or 3D, an expression parser, and some statistics simulation tools.
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 Java PHASER Project: A Universal Simulator for Dynamical Systems  Jason Glick, Huseyin Kocak, Burton Rosenberg
A largescale standalone Java application for graphically and numerically analyzing dynamical systems on a computer. Phaser is designed as a professional research and educational tool, and is being tested in beginning and advanced courses in differential
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 Java Projects  John Lindsay Orr; Dept. of Mathematics & Statistics, Univ. of NebraskaLincoln
Grapher is a general purpose function graphing program. ZoomGrapher is a general purpose graphing program, with facility for zooming in on specified points. IntegGrapher demonstrates the definition of the integral in terms of successive approximations
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 Javascript School Math Toolkit  Jeff LeMieux
JavaScript Pythagorean solver, proportion problem solver, percent proportion problem solver, chord to circumference calculator, denominator to repeating decimal checker, subtraction worksheet generator, addition worksheet generator, multiplication worksheet
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 Java Set Theory Machine  Jay Tomlin
Musical set theory encompasses the notion of defining sets of pitches and organizing music around those sets and their various manipulations. The site offers a Java applet that allows you to manipulate pitch class sets: play them, rotate and invert them,
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 Java Simulations of Cellular Automata Models  Ed Young and L. Charles Biehl
The Forest Fires simulation applet models the spread of fire as a function of the probability that a burning tree will set its neighbor afire, and can include factors of wind and obstacles. The Percolating Oil Spill simulation applet models the percolation
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 JavaSketchpad Center  Key Curriculum Press
JavaSketchpad is software that lets you interact with or publish on the Internet sketches from The Geometer's Sketchpad, a Dynamic Geometry exploration environment for Macintosh and PC computers. JavaSketchpad can be used to share geometry work with people
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 JavaSketchpad DR3 Gallery  Key Curriculum Press
JavaSketchpad is software that lets you publish sketches from The Geometer's Sketchpad on the Internet. If you have a Javacompatible Web browser, visit this demo gallery for some examples of JavaSketchpad in use: Centroid; Stereo Icosahedron; Hypercube;
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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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 JavaSketchpad Files  Jenchung Chuan
Well over one hundred applets based on Geometer's Sketchpad drawings.
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 JavaSlide: the WWW's very first Java Slide Rule  Davie, Kessler
This Java applet implements a fully functional slide rule on your computer screen. The graphics may take some time to download, but you may start using the slide rule immediately. Also an explanation of what a slide rule is and how to use one.
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 Java tFunction  Raymond Berthou
A simple functiondrawing applet. The page contains a description, HTML source, parameters, functions and warnings, history, and examples and samples, as well as the downloadable applet itself. Explanations in English and French.
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 JeoEdit  Grundland, Toussaint; Computational Geometry Lab, School of Computer Science, McGill University
The JeoEdit package, consisting of the JeoEditPoints and JeoEditPolygon applets, is a set of Java visual editors designed to help the computational geometry community realize its algorithms and theorems on the Internet by providing an
interface for drawing
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 Jeometry  Fabrizio Mancini
A geometry sketching device, written in Java and inspired by Cabri, for "proving" theorems simple geometric theorems that do not involve intersections between a line and a circle or between two circles.
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