 Calendar Math  Kees Couprie
Algorithms for converting dates from one calendar to another and for calculating the dates of (religious) events. Also an Excel AddIn available for download.
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 Calendar Quirks  Ivars Peterson (MathTrek)
Calendars represent our efforts to create frameworks that allow us to reckon time over extended periods. We normally count the day  the time it takes Earth to rotate once on its axis  as the smallest unit of calendrical time. The measurement of fractions
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 Calendars  L. E. Doggett
An introduction to calendars: what they are; astronomical bases of calendars; calendar reform and accuracy; historical eras and chronology; the Gregorian Calendar  ecclesiastical rules, history; the Hebrew Calendar  rules, Determining Tishri 1, Reasons
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 Calendrical Calculations  Nachum Dershowitz and Edward M. Reingold
A book about the algorithms used to calculate different calendars (Gregorian, Julian, Mayan, Hebrew, Persian, and more.) The preface, table of contents, index, and a sample chapter are available in PDF and PostScript formats. Other book resources include
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 CalMaeth: Computer Aided Assessment and Learning of Mathematical Methods  Mathematics Dept., Univ. of Western Australia
A collegelevel interactive aided teaching and learning system that poses math questions on various topics and then evaluates the student's answer. It is designed for UWA students, but guest login is enabled. A set of demonstration questions will show
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 Cambridge Physics Outlet (CPO) Online  Tom Hsu
An integrated math/science curriculum that builds skills in three levels for grades 48, 711, and 11/12+. Designed in 11 modules, the curriculum comes with student Activity Guides, detailed Teacher's Guides with full solutions, six kinds of assessment
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 Cambridge University Press
Cambridge University Press is the printing and publishing house of the University of Cambridge. Founded in 1534, the world's oldest press is today one of the largest educational and academic publishers, producing more than 2,000 titles a year in print
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 CAMEL  Canadian Mathematical Society / Société mathématique du Canada
The bilingual (English/French) Web service of the Canadian Mathematical Community, with links to the Canadian Mathematical Society (CMS), the International Mathematical Olympiad (IMO), the European Mathematics Information Service (EMIS), the Société
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 CAMI Educational Software
Creators of interactive educational software emphasizing learner efficiency, reinforcement, and flexibility; and offering diagnosis, practice, and remediation: "The CAMI methodology focuses on knowledge retention as opposed to knowledge transfer....,
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 CAMI Software
International software company, makers of math drill and practice programs. Covers subjects from preschool to early college levels. Company based in South Africa with offices in Australia, Finland, and the United Kingdom.
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 Canadian Applied and Industrial Mathematics Society  Jen Chang, Project Coordinator
Dedicated to the support and development of applied and industrial mathematics in Canada, the Canadian Applied and Industrial Mathematics Society/Société Canadienne de Mathématiques Appliquées et Industrielles (CAIMS/SCMAI)
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 Canadian Forum on Education in Mathematics
The site of the First Canadian Forum on Education in Mathematics, held May 57, 1995 in Château Frontenac, Quebec City. It contains all documents related to the forum, including A. J. (Sandy) Dawson's discussion paper "A Canadian Education in Mathematics:
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 Canadian Mathematical Society (CMS)
The mission of the CMS is to promote research in mathematics; to assist in improving the teaching of mathematics in Canadian universities, colleges and schools, and to encourage and assist in the development of mathematics and mathematics education. Publications
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 Canadian Mathematics Education Study Group  David A. Reid, Acadia University
CMESG is a group of mathematicians and mathematics educators who discuss mathematics education issues at all levels of learning. The aims of the Study Group include studying the theories and practices of the teaching of mathematics, and exchanging ideas
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 Canadian Operational Research Society (CORS)
Société Canadienne de Recherche Opérationnelle (site is in French and English). Past issues of the CORS Bulletin; information about careers in Operational Research, prizes and awards, conferences, speakers, related sites, a history
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 Canadian Society for the History and Philosophy of Mathematics (CSHPM)  Glen Van Brummelen, SecretaryTreasurer
Promotes research and teaching in the history and philosophy of mathematics. A History and Pedagogy of Mathematics Newsletter is free to members; back issues of the HPM Newsletter are available in WordPerfect format. The CSHPM Bulletin, with announcements,
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 Candy for Everyone  Ivars Peterson (MathTrek)
Several students are sitting in a circle. Each student has an even (though not necessarily the same) number of wrapped pieces of candy. On a signal, each student passes half of his or her trove to the student on his or her right. Between signals, the
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 The Canonical List of Math and Jokes  David Ni
A searchable archive of jokes and other humor on general mathematics, proofs, statistics and statisticians, and mathematicians. Also, poetry and quotes.
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 Cantor's Attic  Hamkins, Joel David; and Gitman, Victoria
This "home of large cardinal concepts online" offers a complete account of all the various concepts of infinity in mathematics, particularly a detailed account of the concepts of infinity arising in the large cardinal hierarchy. The wiki includes an
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 The Cantor Set  Math Academy Online/Platonic Realms
An article describing a paradox of infinite sets in measure theory.
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 Cantor's Theorem  Math Academy Online/Platonic Realms
An article describing Cantor's diagonal argument, which proved that infinity comes in many different sizes.
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 Can You Crack the Enigma Code?  Richard Belfield
The official website accompanying Belfield's book, Can You Crack the Enigma Code? "As part of the book, Richard invited a team of experts from the Information Security Group at Royal Holloway, University of London, to create a challenging collection of
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 Captain Astounding's Nightclub  Dan Welchman
A series of books set in a nightclub, the first of which discusses the practical applications of raising a number to the second, third, fourth and fifth powers. Other topics forthcoming, including "The Probability." The books concentrate on the real meaning
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 Card Colm  Colm Mulcahy
This blog "explores mathematical card principles and effects for fun." Inspired by Martin Gardner and his seminal Mathematics, Magic and Mystery, Mulcahy has posted since August, 2011: "A Call For A New Shuffle Principle (Need Rot Sextet?)," "Splitting
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 Card Games  John McLeod
Rules and information, including probabilities, about card and tile games. Indices by alphabetical order, classified by mechanism and by objective (including a list of children's games), arranged by country and the types of cards. Also, commercial, solitaire,
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 Career.edu: Job Board for the Academic and Research Community
Nonprofit job board for the academic and research community. Many academic positions in math, physics, and astronomy.
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 Career Information (SIAM)  Society for Industrial and Applied Mathematics
Examples of questions addressed by applied mathematics  whether genetic engineering, designer drugs, diesel engines, digital TV, financial markets, paper mills, electric power, insurance rates, inflation statistics, computer chips, compact disks, credit
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 Career Network  The Chronicle of Higher Education
Faculty and research positions in mathematics: new job announcements from the latest issues of The Chronicle, plus other information useful to people pursuing careers in higher education. The Chronicle also offers email notification of new job openings.
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 Career Profiles 
AMSMAASIAM Mathematical Sciences Career Information Project
Mathematicians at work: practical answers to the question, Why should I study math? More than 40 short essays written by math majors around the country about the types of work they are doing after having received their undergraduate or graduate degrees.
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 Careers in Mathematics  Department of Mathematics, Purdue University
A compilation of online career resources available to students, both undergraduates and graduates. What Can You Do with a Math Degree? Just what do mathematicians do? Also, resources and FAQs for finding jobs in mathematics, matriculating to a graduate
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 C.a.R. Geometry Program  Rene Grothmann
A dynamic geometry program that simulates constructions with a ruler and compass (Compasses and Ruler). C.a.R. runs on Java as a local application, with Java Web Start, or as an applet in browsers. The free and open source program includes documentation
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 Carl Bialik
Author of "The Numbers Guy," a weekly column on "how numbers are used and misused in the news, business and politics," for the Wall Street Journal Online. Read past columns, such as "Putting a Number on Happiness," "Lightning Stats Are Partly Cloudy,"
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 Carl Eberhart
Class information and/ or Maple worksheets for courses including multivariable calculus, linear algebra, linear programming, differential equations, numerical methods, and topics for mathematics teachers, as well as Maple and C++ programs for a course
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 Carlo Emilio Bonferroni  Michael Dewey, University of Nottingham
A brief description of Bonferroni's life and works, including Bonferroni's inequalities and his interest in algebraic means. With bibliographies.
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 Carl Offner's Home Page  University of Massachusetts, Boston
Expository papers by Offner on mathematics and computer science (levels: advanced undergraduate to 1styear graduate student): Repetitions of Words and the ThueMorse Sequence; Finite Fields and PseudoRandom Number Generation; Some Early Analytic Number
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 Carlson's Fractal Gallery  Paul Carlson
Fractal images in the following categories: 3D Phoenix Spirals; Atan Method (produced by a variety of methods, mostly transcendental functions); 3D Stalks (produced by a variation on a method by Clifford Pickover); Bubbles (standard Mandelbrot); Pokorny
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 Carnegie Foundation for the Advancement of Teaching
An independent policy and research center improving teaching and learning. See in particular Quantway® and Statway®, the foundation's developmental math pathways for community college.
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 Carnegie Learning
A suite of Cognitive Tutors for Algebra I, Geometry, Algebra II and College Algebra. Each course combines computers and paperbased components with professional development, assisting students while ensuring an important role for the teacher. These products
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 Carolina Science and Math Catalogs  Carolina Biological Supply Company
Teachers may request a free catalog with supplies for the math and science classroom. "Carolina Mathematics" includes math teaching supplies, books and workbooks, calculators, posters, tools, and gifts. Features some multicultural materials.
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 Carousel Math  Web Feats Workshop II
Carousels are as reliant on the laws of motion as roller coasters. Let's take a ride on the new Bear Mountain Carousel at Bear Mountain State Park in New York. After enjoying the ride, take the data that has been collected and use the applet to explore
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 CARROLLIA  Mensa España  CarrollSIG
El órgano de comunicación del CARROLLSIG de Mensa España, que se dedica a las matemáticas recreativas, la lingüística, la literatura experimental, la lógica, la ciencia, y todo aquello que hubiera gustado
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 CARTESIO  Camillo Trevisan
An educational computer graphics program for Windows and Macintosh, providing an understanding of the geometric configuration of projections (for example, the positions of the projection plane and viewpoint relative to the Cartesian axes).
All projection
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 Cartesio  Camillo Trevisan
CARTESIO is an educational computer graphics freeware program for high school and college students exploring and analyzing geometric projections and CAD (computer aided design) principles. Site is in Italian and English, with links to the author's homepage
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 Case Studies Index  SyllabusWeb
A case study index from A to Z on technology innovation taking place in high schools, colleges, and universities throughout the world, with current studies and text archives.
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 Casio Classpad 300 Resource Center  Saltire Software
The Casio Classpad 300 is an intuitive pen based calculator with draganddrop mathematics and geometry. ClassPad.org is packed with resources to help both teachers and students access the full power of the ClassPad. It includes many explorations and
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 Casio Kingdom  Sean Tan
CFX9850 games and programs. A game and several programs, including: Sphere (solves where a point is in relation to a sphere, whether it lies outside, inside or on the sphere); Divide (finds the position vector that divides vector AB in the ratio a:b);
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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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 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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