 The Amazing ABC Conjecture  Ivars Peterson (MathTrek)
In number theory, straightforward, reasonable questions are remarkably easy to ask, yet many of these questions are surprisingly difficult or even impossible to answer. Fermat's last theorem, for instance, involves an equation of the form x^n + y^n =
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 Amazing Applications of Probability and Statistics  Kelly Rogers; Intuitor.com
Intuitor.com's Prob. and Stat. page provides clear and concise information
on a variety of topics covered in AP Statistics, including: Probability,
binomial coefficients, data analysis, random numbers, skewness, hypothesis
testing, and power. This
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 The Amazing Mandelbrot Set  Bill Boll
This site hosts a gallery of Mandelbrot Set images and a primer on how the Mandelbrot Set is generated. Posters and a DVD of animations are available.
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 Amazing Math Tutor San Diego  Sam Mirs
Oneonone inhome tutoring for algebra, trigonometry, geometry, precalculus, calculus and college math students in San Diego county. Blog posts, which date back to January, 2013, have included "The 7 Steps to Succeed in Math Tests," "The 3 main Questions
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 Amazing Seattle Fractals  Tutorials  Doug Harrington
Fractal art galleries, fractal tutorials, slide shows, software downloads, guest galleries and more. Four different online fractal art tutorials illustrate step by step how to get started creating this art form based on mathematics.
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 An Amazing, Space Filling, NonRegular Tetrahedron  Peg Cagle and Joyce Frost, Park City Mathematics Institute
The rhombic dodecahedron derives its name from its twelve ("dodeca") faces, all of which are congruent rhombi, each formed by joining two tetrahedra. In this article, Cagle and Frost explore these related polyhedra, showing how to exploit their space
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 Amby's Math Instruction, Reinforcement, and Learning Activities  Amby DuncanCarr
Stepbystep tutorials, with autoscoring quizzes: order of operations, solving word problems, properties of numbers, prime numbers, prime factorization, greatest common factors (GCF), least common multiples (LCM), simplifying (reducing) fractions, changing
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 America Counts  U.S. Department of Education
In 1997 President Clinton issued a Presidential Directive to the Department and the National Science Foundation to work together to devise an action strategy for using Federal resources in support of improving student performance in mathematics. The result
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 American Council on Education (ACE)
A forum for the discussion of major issues related to higher education and its potential to contribute to the quality of American life. ACE maintains a domestic and an international agenda and seeks to advance the interests and goals of higher and adult
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 American Educational Research Association (AERA)
An Association concerned with improving the educational process by encouraging scholarly inquiry related to education and by promoting the dissemination and practical application of research results. Twelve divisions: Administration, Curriculum Studies,
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 American Go Association
Learn to play the ancient Chinese board game called Go in Japan, Baduk in Korea, and Weichi in China. Go is said to be 4,000 years old, and is played worldwide. This site lists clubs and resources for beginning and expert players. The AGA provides free
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 American Indian Science and Engineering Society (AISES)
Membership, chapters, news and events, notices of conferences, internships, and scholarship and educational opportunities.
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 American Institute of Mathematics
The American Institute of Mathematics (AIM) "expands the frontiers of mathematical knowledge through focused research projects, sponsored conferences, and the development of an online mathematics library." See, in particular, the nonprofit organization's
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 American Journal Of Mathematics (AJM)  Shiffman, Shokurov, Hida, Zworski, Eds.; The Johns Hopkins University Press
AJM does not specialize, but publishes articles of broad appeal covering the major areas of contemporary mathematics. Subscription information, guidelines for contributors, and copyright information can be found at the site.
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 American Mathematical Association of Two Year Colleges (AMATYC)
A service for members and other interested professionals to review and receive current information on AMATYC's programs and activities and the activities of affiliates. Conference information, Job listings, list of available publications, how to join
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 The American Mathematical Monthly (MAA Online)  Roger A. Horn, Ed., Mathematical Association of America (MAA)
The Monthly publishes articles, notes, and other features about mathematics and the profession. Its readers include professional mathematicians as well as students of mathematics at all collegiate levels. Authors are invited to submit articles and notes
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 American Mathematical Society (AMS)
eMATH, the home of the AMS on the Web. A searchable site with information on members and activities, government affairs and education, publications and research tools, employment and careers, authors and reviewers, meetings and conferences, what's new
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 American Mathematical Society Committee on Education  EMath  Web Site of the AMS
The Committee charge, membership, contact information, annual reports for prior years, and links to education pages on the site are available.
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 American Mathematics Competitions  Dr. Walter E. Mientka, Executive Director
The American Mathematics Competitions (AMC) seek to increase interest in mathematics and to develop problem solving ability through a series of competitions for junior/middle (grades 8 and below) and senior high school students (grades 912). They include
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 American Pi  Lawrence Mark Lesser
Song lyrics by Lawrence Mark Lesser, approximately to the tune of Don McLean's "American Pie." Read a PDF of the Texas Mathematics Teacher article Slices of Pi: Rounding Up Ideas for Celebrating Pi Day, and see Lesser's "mathemusician" page for more lyrics
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 American Regions Math League (ARML)
An annual national mathematics competition. High school students form teams of 15 to represent their city, state, county or school and compete against the best in the from the United States and Canada. The event consists of Team, Power, Individual and
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 American Scholastic Association
Home of the American Scholastic Mathematics Association (ASMA) Annual Math Contest for junior, intermediate, and senior high schools. Read about the contest design and general information; see a list of the year's high performers and their school affiliations;
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 American Statistical Association (ASA)
A scientific and educational society founded in 1839 to foster excellence in the use and application of statistics to the biological, physical, social and economic sciences. The ASA publishes journals, conducts scientific conferences, fosters a continuing
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 America's Favorite Number (Math Chat)  Frank Morgan, MAA Online
Math Chat invited each reader to send in a number. The most commonly submitted number, with the best explanation of why, wins. Answer: In a tight race between 7 and pi, pi wins by a single vote...
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 The Americas  Mathematics and the Liberal Arts  Todd Hammond
Notes on published articles: a resource for student research projects and for teachers interested in using the history of mathematics in their courses. Many pages focus on ethnomathematics and on the connections between mathematics and other disciplines.
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 AmeriStat  Population Reference Bureau and Social Science Data Analysis Network
Graphical and textual summaries of the demographic characteristics of the U.S. population: marriage and family; population estimates and projections; education, race, and ethnicity; income and poverty; foreignborn population; migration; children; older
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 Amlon Tutors
Private tutoring service based in New York City, covering the NJNYCT area. Math topics covered include: Elementary, Algebra, Geometry, Trigonometry, PreCalculus, Calculus, Sequential I, II, II, Statistics.
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 AMOF: The Amazing Mathematical Object Factory  Frank Ruskey
Combinatorial objects are everywhere. How many ways are there to make change for $1 using unlimited numbers of coins of all denominations? Each way is a combinatorial object. AMOF is part encyclopedia and part calculator, a teaching tool that generates
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 Amortization Calculator  myAmortizationChart.com
Online amortization calculator, with definition, schedules, and links to other financial calculators.
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 Amortization Calculator  Quoteserv
A mortgage calculator for calculating the total cost of a loan, including monthly payments and amortization. Complete breakdown of payments month by month, with great detail.
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 Amortization Schedule
JavaScript calculators for figuring out loan amortizations, investment fees, debt payoffs, savings, timesheets, and tips; for simulating investments; and for comparing savings rates and mortgages.
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 AMPL: A Modeling Language for Mathematical Programming  Bell Laboratories
A comprehensive and powerful algebraic modeling language for linear and nonlinear optimization problems, in discrete or continuous variables. AMPL lets you use common notation and familiar concepts to formulate optimization models and examine solutions,
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 Amplify U Learning Centre  Ahmed Harb
Academic tutoring in math and physics, with mentoring, and peer networking, for grades 712.
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 AMS Bookstore  American Mathematical Society
A searchable catalog of over thousands of books, videos, journals, software and gift items from the AMS and participating publishers.
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 Amsterdam Tessellation Projects  M. HosMcGrane
Student tessellations created using the software program Tesselmania, inspired by a class trip to the Escher Exhibition in Rotterdam, The Netherlands.
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 amte  Association of Mathematics Teacher Educators, Math Forum
A mailing list for discussions concerning teaching standards and practices at the K16 level. Read and search archived messages up through the list's last activity, in September, 2000.
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 amtnys  Math Forum
The general discussion group of the Association of Mathematics Teachers of New York State. Use this service to discuss items of interest to math educators everywhere. Read and search archived messages; and register to post to the discussions.
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 The Analemma 
Bob Urschel, Valparaiso, IN
The figure8 path that the sun makes in the sky is called the analemma. This site explores the paths of the sun and the earth, with investigations into the effects and the math of their elliptical orbits and earth's tilt, and a summation.
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 Analog Gadgets  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Java simulations of analog gadgets. Includes an analog device simulation for drawing ellipses, a Peaucellier Linkage simulation, an angle trisection demonstration, a demonstration/essay on cycloids, and applets on geoboards (with a proof of Pick's Theorem)
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 AnalyCorp
XLSim, analytical business modeling in Excel; INSIGHT.xla, software for Monte Carlo simulation, forecasting, and optimization, with seminars in the application.
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 Analysis and Applications (AA)
Analysis and Applications publishes high quality mathematical papers that treat those parts of analysis which have direct or potential applications to the physical and biological sciences and engineering. Some of the topics from analysis include approximation
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 Analysis & Knowledge  Sanford Aranoff
Download data analysis software, such as Patterns, which analyzes and charts trends in stock market using Andrews concepts. See also this former Rutgers University physics professor and current high school educator's thoughts on teaching and help file
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 Analysis  Math Forum
Links to some of the best Internet resources for analysis: Web sites, software, Internet projects, publications, and public forums for discussion.
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 Analysis of Algorithms  Flajolet, Prodinger
A research site with papers to download, links to researchers, a newsletter, etc. Analysis of Algorithms (AofA) is a field in computer science whose overall goal is an understanding of the complexity of algorithms. While much research is devoted to worstcase
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 An Analysis of the Job Market for Mathematicians  Geoff Davis
Draft of a paper on the mathematics job market, submitted to the Notices of the AMS. It contains: a comprehensive overview of current labor market conditions for mathematicians; a simple model of the supply process that predicts the observed 10 year oscillations
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 Analysis WebNotes  John Lindsay Orr; Dept. of Mathematics & Statistics, Univ. of NebraskaLincoln
An extensive collection of analysis resources, including class notes, discussion boards, and homework assignments, with questions and answers from analysis labs, and techniques of proofs. There are interactive demonstrations of several central themes
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 The Analyst  George Berkeley
A text based on the 1898 edition of the works of George Berkeley, edited by George Sampson, incorporating a small number of changes. Many mathematicians published replies to Berkeley's attack on contemporary mathematical practice in The Analyst. Included
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 The Analytical Engine  John Walker
The mathematician Charles Babbage designed an Analytical Engine, a mechanical precursor to the computer, in the late 1800s. Read historical documents related to the Engine, including Blaise Pascal's account of his mechanical adding machine (in French),
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 The Analytical Group, Inc.
A site that offers a full range of tabulation and statistical services; survey centers, and interviewing and tabulation software: including Query/WinQuery computeraided telephone and personal interviewing (CATI) software, and WinCross, advanced crosstabulation
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 Analytic and Descriptive Geometry  Dave Rusin; The Mathematical Atlas
An introduction to ordinary analytic geometry as studied in secondary school. (Also included here is a rather lengthy analysis of a result known as Poncelet's Porism.) History; applications and related fields and subfields; textbooks, reference works,
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