 Colm Mulcahy
Blog by a recipient of the Mathematical Association of America's Allendoerfer Award for excellence in expository writing. Posts, which date back to October, 2012, have included "Weak Math? Try Math Week!" and "Oranges and Apples Comparisons: The Roots
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 Colorado Model Content Standards for Mathematics
A detailed description of the model content standards for mathematics that were adopted in Colorado in 1995. Standards are provided with an explanation, a rationale, and specific information about the expectations of students in grades K4, 58, and 912.
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 Colorful Mathematics  Claude Laflamme
An educational software series presenting advanced mathematical concepts to K12 students in a gameoriented approach. The five games offered use simple coloring and/or drawing techniques to illustrate mathematical concepts from graph theory. Downloadable
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 Coloring Penrose Tiles  Ivars Peterson (MathTrek)
One set of Penrose tilings consists of a pair of diamondshaped figuresone fat and one skinny. Attempts to color such Penrose diamond tilings led some people to conjecture that three colors suffice. Now, mathematicians Tom Sibley of Saint John's University
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 Coloring (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material on coloring problems, including the Four Color Theorem and other graph coloring problems.
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 Color Mathematics  Erwin Gelber
High school math software for algebra, geometry, and vectors  includes a graphic calculator, an equation solver, and more. Uses a color system for improved memory.
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 Colors of Math  Ekaterina Eremenko Films
Credits, still images, and trailer of a documentary film that features six mathematicians discussing math "in the context of the five senses" of sight, sound, smell, taste, and touch. The Courant Institute of Mathematical Sciences New York University
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 Columbus State University Math Contest  David Rock and Doug Brumbaugh, College of Education, Columbus State University
Problem of the Week, Algebra in Action, Middle School Madness and Elementary Brain Teaser  all available in "challenge" mode. Past problems are archived, with solutions available upon request.
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 Com2MaC: Combinatorial and Computational Mathematics Centre  Pohang University of Science and Technology, Korea
An integrated mathematical research center conducting research in various areas of mathematics and its applications relevant to the information and communication technology necessary for the nextgeneration industrial competitions. Basic research, educational
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 CombinaTexas: Combinatorics in the SouthCentral U.S.  Texas A&M University
Web pages for conferences, with contact information.
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 Combinatorial Figures  Robert M. Dickau; Math Forum
Mathematica pictures that are interesting for elementary combinatorics. Catalan number diagrams; permutation diagrams; derangements; shortestpath diagrams; Stirling numbers of the first and second kind; Bell numbers, harmonic numbers and the bookstacking
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 Combinatorial Games  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A collection of interactive combinatorial games, many implemented in both normal and misère versions, including by Kayles, Nimble, and Northcott; variants of Nim, such as Wythoff's Nim; OnePile and TakeAway games; a subtraction game, a fraction
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 Combinatorial Games Page  Erik Demaine
A combinatorial game usually involves complete information, with no hidden cards and no random randomness  a pure strategy game. Demaine has researched combinatorial puzzles such as Tetris, Clobber, Phutball, Pushing blocks (puzzles involving a robot
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 Combinatorial Game Theory  David Eppstein, Theory Group, ICS, UC Irvine
A list of links to materials on the Web. Combinatorial Game Theory studies strategies and mathematics of twoplayer games of perfect knowledge such as chess or go (but often either concentrating instead on simpler games such as nim, or solving endgames
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 Combinatorial Geometry (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material consisting of problems in which one starts with a geometric figure (say a polytope) but then considers abstract incidence properties of it rather than its metric properties. Most tiling and coloring problems
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 Combinatorial Mathematics Society of Australasia (CMSA)
Information for members of a society formed to facilitate, encourage, foster and cherish the branch of mathematics known as combinatorics throughout Australia, New Zealand and their neighbouring countries. Rules; members; minutes of meetings; annual general
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 Combinatorial Object Server (COS)  Frank Ruskey; Dept. of Computer Science, Univ. of Victoria, B.C., Canada
Specify a type of combinatorial object, together with specific parameter values, and COS will return to you a list of 200 such objects. Generation pages: permutations, combinations, various types of trees, unlabelled graphs, linear extensions of posets,
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 Combinatorica  János Bolyai Mathematical Society, SpringerVerlag
An international journal that publishes research papers in English in a variety of areas of combinatorics and the theory of computing, with particular emphasis on general techniques and unifying principles.
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 Combinatorics and Graph Theory  Department of Mathematics, Umeå University, Sweden
Home page of the Combinatorics Group. Members and research projects, seminars, archives of downloadable software, combinatorial and graph theoretical data, and preprints.
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 Combinatorics  Dave Rusin; The Mathematical Atlas
A short article designed to provide an introduction to combinatorics, loosely the science of counting, studying families of sets (usually finite) with certain characteristic arrangements of their elements or subsets, and asking what combinations are possible,
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 Combinatorics (Graphics Archive, Special Topics)  The Geometry Center
Enumeration problems, and other problems involving counting, including meanders.
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 Combinatorics (MathPages)  Kevin Brown
About 40 "informal notes" by Kevin Brown on combinatorics: Dedekind's problem, cumulative permutation sequences, the factorial number system, Hardy and Ramanujan on partitions, solving magic squares, collecting k complete sets of coupons, and many more.
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 The Combinatorics Net and Annals Of Combinatorics  Bill Chen
Links to combinatorics articles, groups, conference reports, seminars, journals, books, typesetting and graph drawing, software, preprints, open problems, research announcements, news and stories, and related sites. The Annals of Combinatorics publishes
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 Combinatorics, Probability & Computing  Cambridge University Press
Now published bimonthly, the journal covers combinatorics, probability theory, and theoretical computer science. Topics covered include classical and algebraic graph theory, extremal set theory, matroid theory, probabilistic methods and random combinatorial
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 Combinatorics Research Group  Pure Maths Department, The Open University
A group interested in graph theory, design theory, the history of combinatorics, and combinatorial computing. The Group runs the Open University Winter Combinatorics Meeting near the end of January each year.
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 Combinatorists of New England
A series of oneday conferences mostly held at Smith College in Northampton, MA. The Combinatorists of New England meet five times a year. This Web site provides information about future meetings and links to participants' papers available electronically.
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 Combined Membership List  AMS, SIAM, MAA, AMATYC
The searchable Combined Membership List (CML) includes the names and addresses of all persons who were members of the American Mathematical Society (AMS), Mathematical Association of America (MAA), Society for Industrial and Applied Mathematics (SIAM),
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 Combining Science and Mathematics in the Classroom Using Spreadsheets  Dawn M. Laning
A lesson plan involving the use of spreadsheets to investigate data analysis techniques with a set of data gathered in a chemistry experiment. Writeup from a class in mathematics education given by J. Wilson at the University of Georgia, fall 1997.
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 Combustion Chaos  Univ. of Houston, Univ. of Texas at San Antonio
An interdisciplinary research group studying the dynamics of pattern formation in burner stabilized premixed flames. Includes graphics, movies, and Java simulations of different patterns, explanations of models and experiments, and list of related publications;
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 Comedy Tonight, Math Style!  Ivars Peterson (MathLand)
Edward Burger and Colin Adams aren't yet as well known as such famous comedy teams as Laurel and Hardy... but they are not only performers but also math professors at Williams College in Williamstown, Mass. They bring antic energy, slapstick humor, and
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 Comments on Mathematics and Education  E. Lee Lady, University of Hawaii
Notes on the teaching and learning of math. What Is Mathematics? What Makes Mathematics So Hard? My Attitude Towards Teaching. Universities and Learning. Also email comments from readers, on: Teaching Maths in the public schools; Giving Students Power
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 A Common Book of Pi  Neal Carothers
A brief history of extended precision approximations of pi, including Archimedes' method for estimating pi, a proof that pi is irrational, a page full of formulas used to estimate pi over the centuries, and a brief look at a modern algorithm used to compute
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 Common Core Math  New Jersey Center for Teaching & Learning
Freely downloadable teacherdesigned units consisting of one to two hundred Interactive White Board (IWB) presentation slides: each of grades K8, PreAlgebra (available in Spanish), Algebra I (available in Spanish) and II, Geometry, PreCalculus, AP
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 Common Core Online  Darren Burris
Articles on Common Core State Standards (CCSS) mathematics, dating back to December, 2011, as "scooped," or digitally curated, by a Boston, MA, teacher.
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 Common Core Ratios and Proportions Wiki for Sixth Grade  Mary Dooms
Instructional videos, manipulatives, samples of levels of mastery, and other resources on ratios and proportions. See also Dooms' Common Core State Standards (CCSS) wiki for sixth grade geometry.
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 Common Core State Standards Initiative  Common Core State Standards Initiative
The Common Core State Standards aim to provide a consistent, clear understanding of what students are expected to learn, so teachers and parents know what they need to do to help them. The standards are designed to be robust and relevant to the real world,
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 Common Lisp the Language, 2nd Edition  Tom Bylander
Links for most Common Lisp functions (and other entities) to the portion of the online Common Lisp manual where they are defined. Since the index was automatically generated from the online manual, some functions may not be included in this index. Also,
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 Common Mistakes in College Mathematics  Eric Schechter
Pointers for students about mistakes in general mathematics and calculus. Errors include: everything is additive, loss of invisible parentheses, incorrect writing of fractions, derivative of x to the x, unbalanced differentials, and naive answers for
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 CommonSense Questions (Learning and Mathematics)  G. Polya; Math Forum
In his 1957 book, How to solve it, Polya describes a fourstage approach to mathematical problemsolving. He bases his approach on commonsense questions that would naturally occur to an experienced problemsolver. Polya claims teachers should pose these
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 CommonsMath: The Jakarta Mathematics Library  Phil Steitz, The Apache Software Foundation
Commons Math is an open source Java library of lightweight, selfcontained
mathematics and statistics components. Download releases; post to the wiki; read the users guide and project documentation.
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 Communicating Mathematical Expressions on the WWW  Ping
A semantic expression notation known as MINSE (a MediumIndependent Notation for Structured Expressions) with a deployed implementation that makes expressions a reality for the scientific and mathematical Internet community. The aim is to help the scientific
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 Communicating Mathematics with Hypertext  The Geometry Center
An archive of resources, including lecture notes, sample pages and programs, and links to software useful for scientific Web site design and management. The archive is based on the materials developed for a a short course by the same name sponsored by
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 Communication and Collaboration  The Partnership for 21st Century Skills
This page details the communication and collaboration skills framework from P21, and links to additional resources: Web Index for Communication Resources (an online index of many communication related topics and resources), Engauge overview of communication
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 Communication and Information, including Encryption  Dave Rusin; The Mathematical Atlas
See the Report of the Working Group on Cryptology and Coding Theory National
Science Foundation, April 1718, 1997. History; applications and related fields and subfields; textbooks, reference works, and tutorials; software and tables; other web sites
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 Community Colleges Home Page  Maricopa Center for Learning and Instruction
Community colleges are twoyear postsecondary educational institutions that offer certificate programs and Associate of Arts (A.A.) degrees. This site contains a searchable index to the web sites for more than 800 community colleges in the United States,
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 Community for Undergraduate Learning in the Mathematical Sciences  The University of Auckland
This crossfaculty community within The University of Auckland (NZ) brings together all the mathematical science providers at the university to create a researchbased Centre for tertiary education in the mathematical sciences. See, in particular, the
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 The Community of Ordinary Differential Equations Educators  Yong, Darryl; and Borrelli, Robert, Principal Investigators
The Community of Ordinary Differential Equations Educators (CODEE) seeks to improve the teaching and learning of ordinary differential equations (ODEs) through modeling, computer experiments, and other active learning projects. Freely download expository
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 Community of Science, Inc. (COS)  Alfred R. Berkeley, Chairman
A collaborative network of scientists and their institutions. Its goal is to accelerate science and promote the visibility and funding of scientific research. COS has been publishing on the Web since February 1994 and currently works with 200,000 scientists,
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 Commutative, Associative And Distributive Properties (SMILE)  James E. Breashears, Robeson High School
A lesson designed to teach students to compute expressions like (56 + a) + 4 and (50 * 7) * 2; to identify the commutative and associative properties; and to rewrite expressions by using the distributive property. From the Algebra and Trigonometry section
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 Commutative Rings and Algebras  Dave Rusin; The Mathematical Atlas
A short article designed to provide an introduction to ring theory. Commutative rings are sets like the set of integers, allowing addition and (commutative)
multiplication. Of particular interest are several classes of rings of interest in number theory,
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