 Casting Out Nines
This essay explains the technique of casting out nines, a method of checking one's answers in arithmetic problems by eliminating groups of numbers that add to nine.
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 Casting Out Nines  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about casting out nines, including proofs of why the method works.
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 Casting out Nines  Robert Talbert, The Chronicle of Higher Education
Blog from The Chronicle "where math, technology, and education cross." Posts, which date back to December, 2005, have included "Inside the liberal arts math course," "Not to be a calculus heretic or anything, but...," "A taste of Tufte," "A proposal about
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 CASTLE Software
Computer Assisted Student Tutorial Learning Environment (CASTLE) software for Windows, for high school science, social studies, and mathematics  algebra, geometry (including probability), and trigonometry. Includes a tutorial program for student review,
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 Cast Your Vote! What's Your Opinion On Polling?  Annenberg Media
An exhibit that explores wellknown statistical concepts  random sampling, margin of error, and confidence  through activities where YOU play the pollster. Also included is a wealth of links to Web sites related to statistics. The exhibit is part of
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 CataList: Catalog of LISTSERV Lists  LSoft international, Inc.
From this page you can browse any of the approximately 30,000 public LISTSERV lists on the Internet, search for mailing lists of interest, and get information about LISTSERV host sites. This information is generated automatically from LISTSERV's LISTS
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 Catalog of Isohedral Tilings by Symmetric Polygonal Tiles  Doris Schattschneider
A collection of Sketchpad and JavaSketchpad files supplementing the article
"One Corona is Enough for the Euclidean Plane" by mathematicians Doris
Schattschneider and Nikolai Dolbilin. Tilings of the Euclidean plane by a single polygon are considered,
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 Catalog of Mathematics Resources on WWW and the Internet  University of Wisconsin Marathon County (UWMC)
Links to general mathematics WWW Servers in the United States and in other countries. Also lists of servers for: Pure Mathematics, History of Mathematics and Biographies; Applied Mathematics; Math Teaching, Math Education and Math Student Servers; Statistics;
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 A Catalog of Random Bits  Ivars Peterson (MathLand)
Researchers use random numbers for tackling a wide range of problems, from modeling molecular behavior and sampling opinion to solving certain equations and testing the efficiency of algorithms. Such numbers also play crucial roles in a wide variety of
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 Catalog of the Scientific Community in the 16th and 17th Centuries  Albert Van Helden
A searchable collection of 631 detailed biographies with facts about each individual and his or her contributions to science, compiled by the late Richard S. Westfall; Dept. of History and Philosophy of Science, Indiana University.
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 Catalogue of Algebraic Systems  John Pedersen, W. Edwin Clark; Dept. of Mathematics, University of South Florida
Bilinear algebras/ Algebras / Associative algebras; Boolean algebras; Cylindric algebras; Fields; Groupoids; Groups; Inverse semigroups; Jordan algebras; Kleene algebras; Lattices; Lie algebras; Loops; Modules; Monoids; Nearfields / Nearfields; Nearrings;
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 Catalogue of Lattices  Neil Sloane, Gabriele Nebe
A catalogue of different types of lattices, combinatorial objects with direct applications to packing spheres into a limited amount of space.
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 Categorical Geometry  Zhaohua Luo
See a brief tour of categorical geometry, which studies the geometric properties of unitary categories. The categorical approach to algebraic geometry was initiated by Yves Diers in his pioneer book Categories of Commutative Algebras (Oxford University
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 Categories and Combinatorics Group  Mathematics and Statistics, Univ. of Sydney, Australia
Category theory is a recent branch of mathematics originating in algebraic topology, but rapidly establishing connections with algebra, logic, algebraic and differential geometry, and most recently computer science. Category theory is particularly suited
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 Categories, Quantization, and Much More  John Baez
An introductory article touching on noncommutative, but still associative, algebras, the notion of a category, the axioms for a category, and more.
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 Category Theory Demonstrations  Jocelyn Paine
This is a Web page with buttons that generate examples, with diagrams, of concepts in category theory. These include: initial and terminal objects, products and coproducts, equalisers and coequalisers, pullbacks and pushouts, and limits and colimits.
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 Category Theory, Homological Algebra  Dave Rusin; The Mathematical Atlas
A short article designed to provide an introduction to category theory, a comparatively new field of mathematics that provides a universal framework for
discussing fields of algebra and geometry. While the general theory and certain types of categories
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 Category Theory  JeanPierre Marquis
An entry in the Stanford Encyclopedia of Philosophy covers category theory's definitions, history, and philosophical significance. Also includes a bibliography.
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 CATS: Combinatorial Algorithms Test Sets  ACM Journal of Experimental Algorithmics (JEA)
Mission: to facilitate experimental research by standardizing common benchmarks, providing a mechanism for their evolution, making them easily accessible and usable, and identifying significant open questions in the design of good test sets and the assessment
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 Cattle of the Sun  Ivars Peterson (MathTrek)
The story goes that Archimedes of Syracuse (287212 B.C.) was annoyed with Apollonius of Perga (262190 B.C.), who had criticized Archimedes' work on the multiplication of large numbers. For revenge, Archimedes devised a fiendish computational problem
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 CAUSEweb  Dennis K. Pearl, Director
The Consortium for the Advancement of Undergraduate Statistics Education (CAUSE) collects, reviews, develops, and disseminates resources for members of the undergraduate statistics education community. Resources include lesson modules for lecturers; computer
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 cavmaths  Stephen Cavadino
Blog by a maths teacher and KS5 coordinator. Posts, which date back to July, 2012, often incorporate social media and snapshots of scratch work: "Christmaths Projects," "Engaging with Written Feedback," "Consistency, Humour, Well planned Lessons and
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 C/C++ Café: Scientific Computing with C/C++
The site provides an open forum for discussion to assist programmers of scientific applications in analyzing and improving the performance of their code.
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 CC (Concord Consortium) Library: Papers  Robert F. Tinker
From Robert F. Tinker, Director of the Educational Technology Lab of the Concord Consortium, a nonprofit, research and development organization dedicated to furthering the technology revolution worldwide through innovations in hardware, software, learning
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 CCSSI Mathematics
This blog takes "a critical look at the common core state standards in mathematics." Posts, which date back to April, 2012, have included "The concept of none" and "Does a kindergartner need to know what a hexagon is?"
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 Cédric Villani
For mathematicians, the 2010 Fields Medalist offers his publications, lecture notes for students, errata sheets, and his research into collisional kinetic theory (Boltzmann type), collisionless kinetic theory (Vlasov type), and optimal transport. "For
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 CEISMC (Center for Education Integrating Science, Mathematics and Computing)  Georgia Institute of Technology
CEISMC includes the Virtual Institute, which introduces teachers to technology, connects them to the Internet, encourages collaboration, and provides training and resources; and other programs for students and teachers covering: mentoring; career awareness;
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 The Celestial Image of a Polyhedron (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
Using the celestial image of a polyhedron to get yet another proof of Descartes' angledefect formula. What pattern is traced out on the celestial sphere when you move a flashlight around on the surface of a cube, keeping its tail as flat as possible
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 Celestial Mechanics and the Stability Problem  Jeff Suzuki, Boston University
A thesis that traces the history of the problem of proving (or not) that the solar system is dynamically stable over a long period of time (like geological eras), between the publication of the Principia of Newton (1687) and the works of Laplace (1787).
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 CelLab  Rudy Rucker and John Walker
Programs to explore cellular automata, for Windows or MSDOS, which allow you to view preset patterns, or create your own rules using Java, C, Basic, or Pascal. Download a copy or subscribe to a mailing list. The substantial User's Manual includes bibliographies
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 Cellular automata and Neural Nets in Basic  Sjoerd.J.Schaper
Some QBasic/FreeBasic programs for graphs, cellular automata and neural
networks. Grids.zip package contains sources, input files and win32
executables. Page contains selected links for further enlightenment.
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 Cellular Automata  Carter Bays
Applets for Conways' Game of Life, pentagonal cellular automata, triangular cellular automata, hexagonal cellular automata, threedimensional (3D) cellular automata, and more.
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 Cellular Automata Dynamics  Rafael Espericueta
Explorations of 0, 1, and 2dimensional cellular automata; and applications of cellular automata to ecosystem modeling. A slide show of the table of contents of the book is available here, as well as the full text of the book, in pdf format.
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 Cellular Automata Miscellanea  José Manuel Gómez Soto
Cellular automata theses, reports of summer research, working papers, lectures, and articles, some in Spanish, many by Harold V. McIntosh. Also, download the CAM/PC exerciser CAMEX and a program collection of NXLCAU, the Linear Cellular Automata for NeXTSTEP.
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 Cellular automata simulator for a *nix platform  Igor Serikov
Key features: declarative input language for rules and for initial patterns definition; ability to emulate Conway's Life Game via proper rules specification; ability to demonstrate self replicating loops; total number of rules can be substantially decreased
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 Celsius to/from Fahrenheit  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about converting Celsius to and from Fahrenheit, such as "Is there a temperature that is the same on both the Celsius and Fahrenheit scales?"
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 CeMaST: Center for Mathematics, Science, and Technology  Dossey, Loepp, Fisher; Illinois State University
A program founded in 1990 to provide a locus of campuswide efforts for research, teacher education, curriculum development, and dissemination efforts as they apply to integration in mathematics, science, and technology education. Further information
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 Census and Statistics Department, Hong Kong Special Administrative Region  Hong Kong SAR Government Information Centre
The statistics collection department of the Hong Kong Government. Key geographic, climate, population, and socioeconomic data, press releases, other publications, and an overview of the department. Frequently requested timeseries are available online
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 Census Challenges (Math Chat)  Frank Morgan; Christian Science Monitor
Gordon Squire notes that planners for the 2000 U.S. Census wonder what to do about missing certain groups of people such as many homeless in New York. Suggestions include statistical random sampling. What approach would you suggest?
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 Census Sampling Confusion  Ivars Peterson  Science News Online
To obtain a more accurate enumeration in the year 2000, the Census Bureau has proposed integrating the results of conventional counting techniques with the results of a large sample survey of the population, but others want to use the straight count (direct
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 Center for Advancement of Learning: Learning Strategies Database  Muskingum College, New Concord, Ohio
Database of background information, purposes and advantages of various strategies, and descriptions of specific strategies themselves. Subjectspecific strategies, including math, and a variety of general purpose strategies are available.
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 Center for Applications and Technology in Mathematics Education (CATME)  Jeremy Haefner; Mathematics Dept., Univ. of Colorado
A comprehensive technology resource for mathematics instructors. The CATME trains Colorado teachers, through its Certificate Program, on the use of technology for mathematics education, and provides continuing support in the form of a newsletter, a resource
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 Center for Applied Probability (CAP)  C. Heyde; Columbia University
An umbrella organization under which diverse research and educational activities in probability and its applications are focused and supported, especially at Columbia University, but with a view to local, national, and international visibility. In addition
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 Center for Applied Probability  Georgia Tech
Formed in the Spring of 1995, run by a group of faculty members in the School of Mathematics and the School of Industrial and Systems Engineering (ISyE) at Georgia Tech. Members, events, mailing list, links to other sites.
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 Center for Applied Special Technology (CAST)
An educational, notforprofit organization that uses technology to expand opportunities for all people, including those with disabilities. CAST conducts applied research in universal design; develops and releases products that expand opportunities for
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 Center for Cognitive Technology  Richard E. Clark, Director
Conducting and analyzing interdisciplinary research on the role of new technology in the development of advanced expertise and performance motivation. See, in particular, the publications "Teaching general problemsolving skills is not a substitute for,
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 Center for Complex Systems Research  University of Illinois at UrbanaChampaign
A research group studying the phenomena of systems with a large flow, such as turbulence and information flow on the Internet. Includes an outline of current research projects and outreach programs (can researchers "resonate" with atrisk kids?).
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 Center for Computational Mathematics and Applications (CCMA)  Mathematics Dept., Penn State University
A focal point for research and educational activities in numerical analysis and applied mathematics at Penn State. Applied and Computational Math Seminar Series; PDEs and Numerical Methods Seminar Series; faculty, grad students; visitors and postdocs;
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 Center for Computational Mathematics (CCM)  Dept. of Mathematics, Univ. of Colorado at Denver
A broadbased response to rapid and dramatic changes in the various fields of computation, the Center is intended to be a highly interdisciplinary organization with associates in other departments at CUDenver, on other campuses of the Rocky Mountain
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 Center for Dynamical Systems and Nonlinear Studies  School of Mathematics, Georgia Tech
Established in September 1988 to strengthen existing research activities in the School of Mathematics with special focus on dynamical systems, differential equations, nonlinear analysis, and applications. Specific topics emphasized are stability, nonlinear
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