 Hummer's Mind Reader  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Java simulation of a magic trick invented in the 1950s by the magician Bob Hummer. Choose one of three coins. Swap the other two, then swap as many pairs as you like. When you're done, the computer will announce your selection. The explanation includes
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 HyperCube  Harmen van der Wal
A stereoscopic 4D Java game in and around the hypercube (stereoscopism optional). The page also includes instructions on how to see in four dimensions, and how to see stereograms (read "rotated cubes" for "twisted cubes" in the 4D piece). See also Point
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 HyperCuber  Greg Ferrar
A Java applet that lets you rotate a fourdimensional cube in four dimensions. HyperCuber is a freeware program for 680x0based Macintosh computers that displays and rotates wireframe objects of arbitrary dimension, like hypercubes (fourdimensional cubes).
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 HyperGami and JavaGami  Ann & Mike Eisenberg; Inst. of Cognitive Science, Univ. of Colorado, Boulder
HyperGami and JavaGami are software environments for designing and building paper sculpture. Choose from a number of starting polyhedra, which appear in a 3D window alongside a corresponding "folding net" in a 2D window. Employ both builtin features
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 HyperMath  Carl R. (Rod) Nave; Georgia State University
HyperMath uses concept maps to explore mathematics ideas and applications to physics and astronomy. Originally developed in HyperCard, HyperMath covers the topics of algebra, trigonometry, geometry, vectors, linear algebra, logarithms, exponents, calculus,
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 HyperPhysics  Carl R. (Rod) Nave; Georgia State University
HyperPhysics uses concept maps to explore physics ideas and applications. Originally developed in HyperCard, the networklike environment provides for numerical exploration in the form of active formula and standard problems implemented in Javascript.
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 Hypersonic Aerodynamics Index  NASA Glenn Research Center
Primers, some with animations or Java applets, on hypersonic and high supersonic flows  when air molecules break apart, producing an electrically charged plasma around aircraft. Large variations in air density and pressure occur because of shock waves,
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 IAmProximus.com: Study Smarter  the Smartacus Corporation
Learn business math, college algebra, precalculus, trigonometry, and more, through a library of interactive Flash (TM) tutorials designed for handheld PDAs that run the Palm OS. Free oneday trial (cancel after 24 hours or be charged the monthly rate),
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 IASolver: The Brandeis Interval Arithmetic Constraint Solver  Timothy J. Hickey
A Java applet that uses interval arithmetic techniques to solve systems of nonlinear constraints. It includes a 'safe plotting' feature for plotting projections of the constraint set onto any two variables. The source code is also available.
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 IB Math Prep  Stan Rachelson; Distance Education Courses, Inc.; South Carolina Educational Communications
IB Math Prep contains video lessons designed for students to prepare for the IB Math Exam. The lessons address the topics found in the International Baccalaureate Math Standard Level (SL) curriculum including: Algebra/Functions, Circular Functions/Trigonometry,
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 IFORS tutORial Project  Moshe Sniedovich
A library of selfcontained modules, each dedicated to a relatively small OR/MS topic, from the International Federation of Operational Research Societies (IFORS). Modules typically contain some of: text, images, computer code, animation, and user interface
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 iKodeko  iKodeko Software, Inc.
Free online math quizzes cover least common multiple (LCM), Roman numerals conversion, number to words, and algebra word problems. Review performance, and participate in discussions around individual test items. Download the iKodeko Worksheet Maker freeware
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 Image Coding Using Wavelets  Signal and Image Processing Group, University of Bath
Read the article "What makes a good orthonormal wavelet for image compression?" Download other wavelet articles in PDF or PostScript format. Visit the Wavelet Warehouse, a repository of wavelet filters (biorthogonal and orthonormal) to download and
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 Imaging Raytracer  Paul Flavin
A raytracing applet with which you can generate the six quadric surfaces  sphere (ellipsoid), cone, hyperboloid of one and two surfaces, paraboloid, hyperboloic paraboloid  and the cylinder.
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 Imaging the Imagined  Paul Flavin
Modeling with Math and a Keyboard: the art and science of modeling; the math, theory and practice of rendering, imaging, and animation. An introduction to raytracing and the Quadric surfaces; Platonic Solids and Polyhedra; 'Tensegrity' (tension) structures;
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 Imagiware
A commercial site that including several games. A Java triangle puzzle; Web Puzzler lets you unscramble an image; MasterWeb is like the board game MasterMind; "Nowwwhere" is a Webaccessible virtual world; and there is a version of Mancala, too.
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 iMath
A free mathenhanced Web browser/editor supported by a net service to enable
the sending, receiving, storing, publishing, and discussion of pages with
math notation.
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 Impressions from ICME9  Cut the Knot!, Alexander Bogomolny
Statistics on attendance (by country) at the International Congress on Mathematics Education held in Tokyo, Japan in August, and impressions of talks on the state of mathematics education in the year 2000. According to Mogens Niss (Denmark) who gave the
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 Indian Math Online  Indian Math Online, LLC
A webbased learning system developed with principles of mathematics as practiced throughout the Indian education system, including starting early, testing frequently, practicing continuously, building steadily, and involving parents actively. IMO first
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 Industryshack: online unit conversion tools
More then 80 engineering and common unit conversion tools for students, engineers and scientists, as well as links to engineering calculators.
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 The Inflation Calculator  S. Morgan Friedman
A web form that adjusts any given amount of money for inflation, according to the Consumer Price Index, from 1800 to 2005. Pre1975 data are the Consumer Price Index statistics from Historical Statistics of the United States (USGPO, 1975). All data since
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 InfoMath
Online K12 math, following the premise that learning mathematics the traditional way is more effective than by playing games. Webbased courses: Math Tutor, PreAlgebra Tutor, Algebra Tutor, PreCalculus.
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 InstaCalc Online Calculator  Kalid Azad
InstaCalc is a fast, shareable and free online calculator. You can compute answers quickly and share a link to any result. Instructions and examples available on the site.
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 Instituto Nacional de Estadística e Informática (INEI)  Perú
El Instituto coordina las actividades estadísticas e informáticas oficiales del Perú. Notas de Prensa; Capacitación (Escuela Nacional de Estadística e Informática y Capacitación a Distancia con cursos para el Censo);
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 Integer Jim's Math Squad  Jim Bennett
Creative ways to use art, writing, research, and Internet projects to make math more exciting for students. The Math Squad art projects are yearlong projects; rather than "lesson oriented," they create an "adventure theme" that facilitates math instruction.
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 The IntegerZone  Philip Dorrell
A Java applet which presents the integers as a scrollable rectangular grid of cells, each cell displaying one number. Different modes illustrate different mathematical topics by defining the user's interaction with the grid in terms of response to mouse
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 The Integrator  Wolfram Research, Inc.
A Web interface to Mathematica 3.0. Type in any integral or choose a random sample, and The Integrator sends a Mathematica Link message to a Mathematica kernel, which then does the integral using its builtin Integrate function. The result is sent back
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 Interactivate: Assessments  Shodor Education Foundation, Inc.
A set of Shodor's Interactivate activities that allow the user to keep track of correct responses. To use these activities as "assessments" just select the "Keep Score" button on the Java applet page. A number of these activities, the Connect Four type
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 Interactive Algebra  Robert Bunge
Java applets that allow you to practice your equations, factoring, and graphing skills, with multiple levels in each category. The applet generates random problems, which you work on paper, and you can check your answers when you're ready. Hints are also
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 Interactive and animated Geometric Algebra with Cinderella  Eckhard Hitzer
More than 90 JAVA applets that range from the elementary concepts of vector, bivector, outer product, and rotations, to triangle relationships, oscillations, and polarized waves. A special group of 21 applets illustrates three geometrically different
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 Interactive Course on Projective Geometry  Juan Carlos Alvarez Paiva; Polytechnic University, Brooklyn, NY
An interactive, discoverybased course on projective geometry. Lecture notes, sample exams, applets, and a list of recommended reading are provided.
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 Interactive Games  Cathleen J. Chamberlain and Mark Cogan, Oswego City School District
Design matching games and quizzes. Premade games include Ghost Blasters and Sum Sense, for practicing arithmetic; Banana Hunt, for estimating angle measures; Bang on Time, Class Clock, and Stop the Clock; Billy Bug, for learning coordinates; Fraction
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 Interactive Geometry with JavaSketchPad  Bryan Dye; MathsNet
Java applets illustrate geometrical figures (circle, cuboid, equilateral, isosceles, and scalene triangles, kite, parallelogram, regular hexagon, octagon, pentagon, quadrilateral, square, rectangle, rhombus, trapezium); show what is meant by congruence,
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 Interactive Introduction to University Maths  Emma Thomas, The University of Surrey, England
An introduction to matrices and determinants; vectors and 3D planes; and Jordan normal forms. With proofs and examples. Based on the curriculum for first year students pursuing the degree in mathematics from the University of Surrey. Requires Java.
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 Interactive Java Applets  Fergus Murray
Dragoric (The animated fractal toy); Toroidia (Adventures in toroidal geometry); Trochor (Fun with trochoids). See also Fergus Murray's Mathematical Graphics Page, and his mathematical animations.
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 The Interactive Mandelbrot Set
A Java applet that allows you to zoom in on portions of the Mandelbrot set.
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 Interactive Math  Christopher Henrich
Topics in recreational mathematics, including polyhedra, kaleidoscopes, magic squares, and trochoids, presented with interactive applets.
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 Interactive Mathematics Miscellany and Puzzles  Alexander Bogomolny
"The peculiar beauty of Mathematics lies in deduction, in the dependency of one fact upon another. The less expected a dependency is, the simpler the facts on which the deduction is based  the more beautiful is the result." This awardwinning site offers
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 Interactive Mathematics  Murray Bourne, Ngee Ann Polytechnic, Singapore
Flash Tutorials for PreCalculus (Algebra, Trigonometry, Logarithms, Complex Number Systems, Graphs); Calculus (Differentiation  The Derivative, its Applications, Deriving Transcendental Functions; Integration, its Applications and Methods), and Advanced
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 Interactive Math Text Projects  Math Forum
Links to interactive texts on the World Wide Web.
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 The Interactive Physics Problem Set  UC Berkeley Instructional Technology Program
This web site contains almost 100 practice problems for physics students. They're accompanied by detailed solutions and interactive computer experiments. (The computer experiments only run on Macintosh computers that have Interactive Physics II installed,
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 Interactive Precalculus Modeling  Leon La Spina & Students; Bethpage High School, Long Island, NY
An online precalculus curriculum, with problems illustrating a variety of applications, many including detailed solutions and some others with interactive animations. Precalculus modeling refers to the process of finding functions that predict and describe
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 Interactive Real Analysis  Bert G. Wachsmuth
Interactive Real Analysis is an online, interactive textbook for Real Analysis or Advanced Calculus in one real variable. Organized into the topics of sets and relations, infinity and induction, sequences of numbers, topology, continuity and differentiation,
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 Interactive Science Activities on the Web (ISAW)  Richard L. Bowman; Bridgewater College, Bridgewater, VA
Java activities demonstrating fractals and Kepler's laws of planetary orbits. Includes a lab activity using the planetary orbit applet.
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 Interactive Site of Numerical Analysis and Numerical Methods  Roberto Linares
Type in a numerical problem described as variables and equations, and select the
method to solve the specific problem. Problem types include derivation, integration, global and onedimensional optimization, open methods and bracketing for root finding,
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 Interactive Tests  Ron Knott
Ron Knott has begun producing Mathematics A and AS Level tests for the independent UK curriculum development body, Mathematics in Education and Industry. The webbased format of the tests let you view a problem and then: choose an answer from a multiple
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 Interactive Tools for Investors  The U.S. Securities and Exchange Commission (SEC)
A mutual fund cost calculator, a taxfree vs. taxable yield comparison calculator, a social security retirement planner, a margin calculator, and a ballpark estimate retirement calculator. Also, investor quizzes.
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 Interest Calculations  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A Java tool for loan and investment calculations with historic background and explanation of the formula.
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 Interest Tutorial  Joseph L. Zachary
A tutorial that explores the concepts of simple, compound, and continuous interest. Includes a Java applet that opens in a separate window, for use alongside the tutorial. From a Computer Science course at the University of Utah, and the book Introduction
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 InterMath Dictionary  The University of Georgia
A searchable dictionary for middle schoollevel mathematics students, teachers, and parents. The dictionary provides related terms, everyday examples, interactive checkpoints, and challenges. Funded by the National Science Foundation, InterMath is a collaborative
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