 CLICAL  Pertti Lounesto; Helsinki Institute of Technology, Finland
A calculatorlike Windows/DOS computer program for vectors, complex numbers, quaternions, bivectors, spinors, and multivectors in Clifford algebras, intended for researchers and teachers of Clifford algebras and spinors. CLICAL works directly on intrinsic
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 Click and Climb: Online Math Tutoring and Homework Help  ClickandClimb.com
Online math tutoring and math homework help resource. Professional tutors work with you oneonone using interactive whiteboard technology and VOIP (Skype) for audio. Tutoring is offered in grades 312 at your pace. You'll need a computer with high speed
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 Clickmazes  Gilbert, Mitchell
An extensive collection of interactive puzzles and mazes organized in the following categories: Maze gallery; Attic gallery; Maze of Life; HexaRoll; Oskar's fourbit mazes; 2D tilt mazes; Colourzone mazes; 3D tilt mazes; Tilt puzzles; NEWS and RULES;
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 The CliffHanger (MSTE)  Nicholas Exner; University of Illinois at UrbanaChampaign (UIUC)
A Java simulation of statistics and probability. From where he stands, one step toward the cliff would send poor Homer Simpson over the edge. He takes random steps, either toward or away from the cliff. At any step his probability of taking a step away
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 CLIFFORD: A Maple V (Rel. 5.1) Package for Clifford Algebra Computations  Rafal Ablamowicz
For PCs. Also available is a version compatible with Maple V R.3 and R.4. Freely available for personal use only.
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 Climate Classroom  One Million Acts of Green
This curriculum encourages students to analyze the science of global warming and its relevance to current events and their daily lives, through classroom activities, lesson plans, and family and community activities. The One Million Acts of Green Program
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 Climate Dynamics, Chaos and Quantum Mechanics  Dr. A. Mary Selvam
A theory of everything for chaos, quantum mechanics, and gravity, applicable to macroscale weather patterns and subatomic dynamics as well as turbulent fluid flows. Contents focus on nonlinear dynamics and chaos (fractal geometry), iteration, a cell
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 The Clique Algorithm  Ashay Dharwadker
A polynomialtime algorithm for finding maximal cliques in a graph with new bounds on Ramsey numbers.
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 CLKCalculator  Lars Kobarg
Reverse Polish notation Calcualtor is a calculator program for Windows with unit conversion and matrix calculator, functions for vectors and complex numbers, and a
function plotter.
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 CLKCalculator  Lars Kobarg
A skinnable calculator for Windows, intended for a wide range of users. Use algebraic or RPN input mode to do unit conversions, matrix calculations, complex number calculations, vectors handling and function plotting. Find constants or formulas in the
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 CLN: Community Learning Network
Designed to help K12 teachers integrate technology into their classrooms. Includes over 225 menu pages with more than 4,200 annotated links to educational WWW sites, as well as over 100 WWW resources of their own.
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 Clocks and Curvature (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
The total curvature of any surface topologically equivalent to the sphere is 4 pi. This can be seen very simply from the definition of the curvature of a region in terms of the angle of rotation when the surface is rolled around on the plane; the only
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 Clocks  Bill Finzer, Key Curriculum Press
Two sketches illustrating useful Sketchpad animation techniques. Shows how to move the hour and minute hands at different rates, and how to convert the analog motion of the clock into digital switches.
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 Clockworks: From Sundials to the Atomic Second  Britannica.com
A site about the development of instruments that have measured time over the centuries. Each instrument has a page featuring a description and an illustrated diagram, and most include a QuickTime animation demonstrating how the mechanism works. Iinstruments
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 Clusters and Decagons  Ivars Peterson  Science News Online
A novel pattern made up of overlapping, 10sided tiles may serve as a model of how atoms arrange themselves into a quasicrystalline structure.
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 Clutch Hitting  Elan Fuld
Download the PDF of a study examining whether clutch (or choke) hitters exist in professional baseball. Using playbyplay data, Fuld found substantial evidence that clutch hitters exist in Major League Baseball, when sacrifice flies are considered as
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 CMAP  CBased Mathematical Application Programming Environment  Dr. Kinh H. Ha
Free, educational software that provides a visual, comprehensive, and compact environment for numerical computation, graphics, and rapid development of computational software. Joining this Yahoo! Group enables download of the program and notification
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 CME Project  Center for Mathematics Education, Education Development Center, Inc. (EDC)
The CME Project is a fouryear, NSFfunded, comprehensive high school mathematics program that is problembased, studentcentered, and organized around the familiar themes of Algebra 1, Geometry, Algebra 2, and Precalculus. The CME Project sets as its
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 CMP Software  Connected Mathematics Project, Michigan State University
Downloadable software designed to accompany CMP units. For the Factor Game winning strategies involve distinguishing between numbers with many factors and numbers with few factors; students analyze game strategies and are introduced to the definitions
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 CMP Unit Organizers  Art Mabbott
To introduce students to new units from the Connected Mathematics Project (CMP), Art Mabbott has developed a set of Unit Organizers. Adapting work done by B. Keith Lenz, of the University of Nebraska, Mabbott has also shared his MS Word documents with
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 CMS  Science Fair Page (Cyberspace Middle School)  Dr. Larry Dennis; Department of Physics, Florida State University
A page for students who are using the World Wide Web to gather information on science fair projects. It includes: a help desk; practical hints for selecting and completing a project; descriptions of possible science fair projects; planning a class project;
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 Coastal Computer Company
An educational software company. Math titles, AlgebraMAKER and MathMAKER, drill students in basic skills, explaining the solution to each problem. Samples of these programs are available for download.
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 CoCalc
Web service for online computation of mathematics (SageMath, SymPy, Maxima) and statistical analysis (R project, Pandas, statsmodels, scikitlearn, Tensorflow, NLTK).
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 CoCoA System  Robbiano et al.; Italy
A free, multiplatform software system for running computations in commutative algebra. CoCoA's principal area of expertise is operations over commutative rings of polynomials; it can readily compute Gröbner bases, syzygies and minimal free resolutions
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 CO Combinatorics (Front for the Mathematics ArXiv)  Univ. of California, Davis
Combinatorics preprints, from the U.C. Davis front end for the xxx.lanl.gov ePrint archive, a major site for mathematics preprints that has incorporated many formerly independent specialist archives. Search by keyword or browse by topic.
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 CODEE Learning Assets Library  Consortium for Ordinary Differential Equations Experiments (CODEE)
Electronic versions of the 19921997 CODEE newsletters, which published pedagogical articles, lesson plans, computer experiments, and software reviews related to ODEs. The Consortium for Ordinary Differential Equations Experiments (CODEE) seeks to disseminate,
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 C*ODE*E  Mathematics Dept., Harvey Mudd College
Online archives of the newsletter of the Consortium for Ordinary Differential Equations Experiments, which provided a regular source of ideas,
inspiration, and experiments for instructors of ODEs between 1992 and 1997. Search back issues by issue, keyword,
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 "The Code War"  Beyond Discovery  Dana Mackenzie et al.; National Academy of Sciences
PDF of a science article from the Beyond Discovery series that explores the trail of developments in the branch of mathematics known as number theory that led to modernday encryption techniques. Contents include: Early Ciphers; The Enigma Challenge;
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 The Coffeecup Caustic  Roy Williams
You are drinking from a cylindrical cup in the sunshine. Sometimes, when the sun shines into the cup, you can see a crescent of light as the sunshine reflects from the inside of the cup onto the surface of the drink. This Java applet illustrates the optics
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 Coffee Hour Problem of the Week  Matthew McMullen
Classic and "found" problems, as well as original challenges, in number theory, logical reasoning, statistics, calculus, geometry, and algebra. McMullen has posted PDFs of the PoWs, as well as their solutions, since 2007.
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 Cognition Learning and Development Lab  Nicole McNeil, University of Notre Dame
The Cognition Learning and Development (CLAD) Lab studies how children think, learn, and solve math problems, in pursuit of the mechanisms involved in the development of quantitative reasoning, symbolic understanding, and problem solving. What basic cognitive
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 cognitive acceleration  Cognitive Acceleration Associates
Cognitive acceleration (CA) emphasizes "'big ideas' or organizing conceptual strands in mathematics, rather than procedures and algorithms." Published collections of math lessons include Thinking Maths, Primary Cognitive Acceleration through Maths Education,
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 Cognitive Apprenticeship (Learning and Mathematics)  Collins, et al.; Math Forum
In a chapter entitled "Cognitive apprenticeship: Teaching the crafts of reading, writing, and mathematics," in the 1989 book Knowing, learning, and instruction: Essays in honor of Robert Glaser, Allan Collins, of BBN Laboratories, and John Seely Brown
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 Coin Flip for Ben Franklin's 300th Birthday  The Franklin Institute
The Franklin Institute Online invites students around the world to help commemorate Ben Franklin's 300th birthday on January 17, 2006, by participating in a common scientific enterprise. Links on the page include: Practice Worksheet (in PDF format), Results
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 Coin Flipping  Ken White
A page that allows you to gather data on virtual coinflipping experiments. Includes access to data on past coin flipping and an article about coin flipping.
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 Coin Flipping  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about flipping coins, such as "What is the probability of getting two heads and four tails?" and "What is the probability of getting two heads on four flips of an unbiased coin?"
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 Coin Problems  Math Forum, a Classic Problem from the Ask Dr. Math FAQ
Tony has 11 more nickels than quarters. How many coins does he have if the total value of his coins is $2.65?
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 Coins and a Balance Scale  Bennett Haselton
You have twelve coins and a balance scale. One of the coins does not weigh the same as the other eleven, but you don't know if the odd coin is heavier or lighter than the others. How can you determine, in three weighings, which coin is the odd coin?
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 Coins, Art, and Math in North Bay  Ivars Peterson (MathTrek)
North Bay's Nipissing University hosted the annual meeting of the Ontario
Association for Mathematics Education, which attracted about 650 math teachers. As one of the featured speakers, I presented a talk on randomness. My examples included slot machines,
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 Collaborative Learning Discussion Archive  Math Forum
A special project hosted by the Math Forum, this discussion concerned collaborative learning, its definition, its effects on teachers and students, administration and assessment issues, and materials and resources. The discussion began as email conversations,
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 Collaborative Learning  Mathematics Education at The Math Forum
A collection of links to collaborative and cooperative learning resources on the Web, including articles, discussions, and teaching techniques that emphasize collaboration.
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 Collaborative Mathematics  Jason Ermer
Videos for connecting "a worldwide community of mathematical problem solvers" and "cultivating a productive attitude toward challenging problems: one of creativity, resourcefulness, selfconfidence, and perseverance." Two and threeminutelong challenges
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 Collaborative Maths Resources  Collaborative Learning Project
Freely downlaod PDFs of "talkforlearning" lesson plans such as "12 and 24 hour Card Sorting" (clock times), "Buy a Ted" (collect all the parts of a teddy bear, which introduces the concepts such as exact amounts and making change), "Factors Four in
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 The Collage Theorem  Cut the Knot!, Alexander Bogomolny
To find an IFS whose attractor is "close to" or "looks like" a given set, one must endeavor to find a set of transformations  contraction mappings on a suitable set within which the given set lies  such that the union, or collage, of the images of the
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 The Collapsing Compass  Godfried Toussaint
There has been considerable interest during the past 2300 years in comparing different models of geometric computation in terms of their computing power. One of the most wellknown results is the proof in 1672 due to Mohr that all constructions that can
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 Collatz 3n+1 Problem Structure  Ken Conrow
Pages of observations posted to stimulate further research.
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 Collatz Conjecture Calculation Center  Klaas IJntema
JavaScript tools to investigate the Collatz problem, as well as general mathematics tools and some recreational mathematics. Some programs are freely downloadable.
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 Collecting Data and Graphing (SMILE)  John Ramsey, Jr., Teacher's Academy For Math and Science
A multilevel lesson designed to teach students to see the relation of a student's arm span to his or her height; compare data with classmates; construct a graph and plot data; work in pairs cooperatively; learn to use a meter stick; and count the number
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 A Collection of Applets  Sione Palu
Java applets for classroom use. Those created so far include: Polynomial Roots; Frequency Distribution; Completing the Square; Polynomial Fitting; Statistical Analysis; Number Works; and Polynomial Differentiation. Read about Palu's background and educational
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 A Collection of Assessment Strategies  Alaska Department of Education & Early Development
Each section of this page describes and analyzes a particular type of assessment strategy, then lists sources of further information. Following those discussions, samples show how each type of strategy might be used at various grade levels. The given
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