 Who was Marin Mersenne?  Luther Welsh
It was not until the mid 20th century that Mersenne became known primarily for his Prime Number Conjecture. Historically, he was much better known for his correspondence with leading scientists of the day. Interested in optics, he also been called the
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 Why 2001 Won't Be 2001  Keith Devlin (Devlin's Angle)
"It's a good story... But how realistic is the behavior of HAL? We don't yet have computers capable of genuinely independent thought, nor do we have computers we can converse with using ordinary language. True, there have been admirable advances in systems
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 Why Calculus?  Helmer Aslaksen
A course the goal of which is to show why calculus has served as the principal quantitative language of science for more than three hundred years.
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 Why Does BacktoSchool Imply Back to Math?  Keith Devlin (Devlin's Angle)
...in a world where everyone can afford a pocket calculator and a great many people seem to be successful in life with little or no mathematical ability or knowledge of science, why do we place so much emphasis on math and science?
Whatever the answer,
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 Why Do Math?  The Society for Industrial and Applied Mathematics (SIAM)
A showcase for exciting mathematical and computational science topics at an introductory collegiate level. Short popular science articles that illustrate the innovative uses of math in yachting, cochlear implants, neuroscience, space travel, tomography,
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 The Why Files  University of Wisconsin
An electronic exploration of the issues of science, math, and technology that lurk behind the headlines of the day, presenting those topics in a clear, entertaining and accessible manner. Provides a bimonthly feature on the science of everyday life, archived
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 Why Isn't There a Nobel Prize in Mathematics?  Peter Ross
Ross writes that Garding and Hormander state, "The true answer to the question (of the title) is that, for natural reasons, the thought of a prize in mathematics never entered Nobel's mind." Nobel's final will of 1895 bequeathed $9,000,000 for a foundation
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 Why is the Area of a Circle Pi*r^2?  Eva Thury
An explanation of the formula for the area of a circle, based on "slicing" and rearranging the circle.
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 Why is the Mathematician So Messy? (Math Chat)  Frank Morgan, MAA Online
A physicist and a mathematician can clean a house in 6 hours; an engineer and the mathematician in 3 hours; and the physicist and the engineer in 1 hour and 12 minutes. How long would it take the physicist alone?
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 Why is the Product of Negative Numbers Positive? (Question Corner and Discussion Area)  University of Toronto Mathematics Network
A short essay and a description of a practical demonstration.
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 Why It Is Important to Learn Algebra  EdSource
This PDF document is a parent/student guide explaining why Algebra I is a required subject, how it helps prepare students for the future, how Algebra I fits into the student's high school math program, and what parents can do to support their student's
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 Why It's Hard to Fold a Triangle in Half (Math Chat)  Frank Morgan, MAA Online
For a circular piece of paper, the lines along which you can fold it "in half" (with half the area on each side) are precisely the lines through the center. What other shapes work the same way? This works for lots of shapes, such as rectangles, parallelograms,
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 Why major in Mathematics?  Department of Mathematics, University of Georgia
Seven reasons to pursue, or applications of, the major in mathematics: because you like it, because professional schools realize it develops analytical skills and the ability to work in a problem solving environment, because employers highly value those
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 Why Not Geometry?  Cut the Knot!, Alexander Bogomolny
An exploration of the validity of teaching algebra at the middleschool level, testing, mathematics ewducation reform, the goal of education, and a suggestion that geometry might be a more important starting point.
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 Why Study Math? How to Study Math  Math Forum, Ask Dr. Math FAQ
Why do we need to learn math? When are we ever going to use it in real life? Math study tips.
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 Why Teach Mathematics?  Harold Brochmann
A series of articles addressing the questions Why do we have to learn this stuff? Why do we teach mathematics? Is the mathematics we teach relevant? Why is teaching mathematics so difficult?
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 Width, Diameter, and Geometric Inequalities (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material on width, diameter, and geometric inequalities.
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 Wild About Math!  Sol Lederman
Math posts, which date back to October, 2007, have included "10 ways to get wild about Math," "How to square large numbers quickly (part 1)," "26 tips for using learning styles to help your kids with Math," "The algebra of crossmultiplication," "Flexagon
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 Wilder's Fourth Grade Math and Science  Jim Wilder
Wilder's blog, which dates back to July of 2008, has included posts such as "Pumpkin Investigation/Family Math Night," "Spuds, Velocity, & Central Tendency," "predict the pattern," "codes and the tricky elevens," and "thinking about patterns." Wilder
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 Wildlife Trade: Buyer Beware  Shelly Peretz, Thornridge High School, Dolton, IL
Collecting and analyzing consumer values, attitudes, and beliefs regarding wildlife trade and endangered species: a project that demonstrates the feasibility of integrating learning strategies, math, social studies and science within a traditional high
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 Wiles' proof of Fermat's Last Theorem  Paul Hewitt; University of Toledo
An overview, following Glenn Stevens' article in Modular Forms and Fermat's Last Theorem (SpringerVerlag, 1997). Notes from a series of three 1998 lectures.
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 Wiles, Ribet, ShimuraTaniyamaWeil and Fermat's Last Theorem  Dept. of Mathematics and Statistics, The University at Albany
An archive of FLT material from conferences, lecture, meetings, newsgroups, and Web sites. Much of the material that seeded this archive was copied from the former gopher archive pertaining to "Fermat's Last Theorem"at emath.ams.org.
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 William Lowell Putnam Mathematical Competition  The Mathematical Association of America (MAA)
The examination tests originality as well as technical competence. Questions cut across the bounds of various disciplines, and selfcontained questions that do not fit into any of the usual categories may be included. Announcement of winners, description
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 William's Home Page  William Gibbs
A collection of activities that use simple materials to help students explore mathematical concepts. Topics include: shapes and patterns made from paper circles; geometrical activities with magic paper; window patterns from geometrical shapes; where there
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 Will it rot my students' brains if they use Mathematica?  Theodore W. Gray and Jerry Glynn
Excerpts from the introduction to The Beginner's Guide to Mathematica V4. Jerry: "I have young students who reach for their calculators to get the answer to 5×6. My response, when I see that, is to explain that such behavior is socially unacceptable,
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 Will the real continuous function please stand up?  Keith Devlin (Devlin's Angle)
A description and a more rigorous CauchyWeierstrass definition that "forms the bedrock of modern real analysis and any standard 'rigorous' treatment of calculus," with a discussion of how the formal definition involves a major shift in conceptual model
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 Wilson A. 'Snowflake' Bentley (18651931)  Tobias C. Brown
An American farmer who spent most of his life producing photomicrographs of snowflakes at his Jericho, Vermont farm. The site includes a Snow Crystal Display with a sequence of 26 images.
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 Wilson's Inversive Geometry with CabriJava  Wilson Stothers, University of Glasgow
An introduction to inversive geometry, with explanations and illustrations using
CabriJava. Many of the results and ideas are Greek, largely due to Apollonius of Perga. The approach is from the Klein viewpoint, using a group of transformations of a
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 Wilson's Theorem  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A description and proof of Wilson's Theorem, another consequence (Fermat's Little Theorem being one) of Euclid's Proposition VII.30, with related links.
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 Wilson Stothers' Geometry Pages  Wilson Stothers, University of Glasgow
A guide to the various geometry topics on Stothers' pages, including Euclidean, affine, projective, inversive, and hyperbolic geometries, and the Klein View of geometry. These pages began as an experiment in teaching projective conics using Cabri to provide
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 WIMAT  Learning Linear Algebra with the PC  Janiszczak, Knörr
A free DOS and Windows learning and training program, with routines that demonstrate important algorithms or procedures in linear algebra and linear programming such as Gaussian algorithm, procedures for solving linear equations and inverting matrices,
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 WIMS (WWW Interactive Mathematics Server)  Université de Nice  Sophia Antipolis
Interactive mathematical applications, also available in French, with documentation. The server's exercises and programs are designed to find a polynomial with given values; find the Taylor expansion of a function; find a polynomial from its curve; given
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 WINDandSEA  The Oceanic and Atmospheric Sciences Internet Locator  The NOAA Central Library
An atmospheric and oceanic sciences Internet Resource Locator with over 800 selected links to science and policy sites organized by topic and alphabetically within topic. Current interest topics (Year of the Ocean; El Nino)a teacher's corner with teachingrelated
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 window into a math classroom  Sadie Estrella
A snapshotdriven blog subtitled "a glimpse into a math classroom once a day." Estrella's posts, enlivened with pictures of her students and of their work on classroom dryerase whiteboards, have included "Trying Math MetaCognition," "More Arguing about
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 WinFiles.com Windows Shareware Collection  CNET, Inc.
A searchable virtual shareware library. Newest shareware, and shareware classified and sorted by platform on "categories" pages  for details, see the Readme file. Includes calculators, mathematical graphing tools, unit converters, educational games and
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 WinFlash Flashcard Library  Open Window Software
A general purpose study program for helping students memorize math facts. Free flashcard decks and a fractions problem generator for use in mastering basic arithmetic facts. For use with any of the WinFlash series of flashcardbased learning systems.
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 WinKE: A Proof Assistant for Teaching Logic  Ulrich Endriss
An interactive proof assistant based on the KE calculus, a refutation system that combines features from Smullyan's analytic tableaux and Gentzen's natural deduction. The software has been designed to serve as a tutoring system to support the teaching
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 WINKS & KWIKSTAT Statistics Software  TexaSoft
Statistical data analysis software for Windows (WINKS) and DOS (KWIKSTAT). Programs in zipped format to download; free evaluation copy of any program you are interested in seeing. Courses on Statistical Data Analysis and QS9000 Statistical Techniques
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 A Winning Division  Ivars Peterson (MathTrek)
A farmer plans to divide a triangular piece of land evenly between his son and daughter. Because he wants to be scrupulously fair, he would like the two pieces to have not only equal areas but also equal perimeters. Where should he draw the line? This
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 Winning Partitions  Ivars Peterson (MathLand)
The simple idea of partitions has developed into a significant branch of number theory. Indeed, "any time the number of ways of writing a number as the sum of other numbers arises, the theory of partitions can't be far off," says number theorist George
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 The Winning Voting System (Math Chat)  Frank Morgan, MAA Online
Results submitted to the challenge: What do you think is the best voting system among three or more candidates? Joseph DeVincentis suggests a version of approval voting in which each voter has three choices: approval (+1), no opinion (0), or disapproval
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 Winpossible
Online math courses in Winpossible's learning environment replicate the live classroom experience through authoring, presentation and distribution technologies that allow students to hear the teacher's voice and see their handwriting over the Internet.
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 Wired Math  Dean Murray, Soo Go, Jamie Pearson; University of Waterloo (Canada)
A free website created for students and teachers by a teacher for the University of Waterloo. The online games, drills, "follow up exercises," and answers
address topics common to middle grades on every continent. Also availalble from http://www.wiredmath.ca/
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 Wireless Philosophy
Free videos on the practice of philosophy — teaching viewers how to develop critical thinking skills and do philosophy, rather than simply learn what philosophers have thought. See, in particular, Wi Phi's categories of videos on the philosophy
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 WIRIS  Ramon Eixarch and Daniel Marquès, Maths for More S.L.
WIRIS math tools include a formula editor, online CAS (Computer Algebra System) and advanced math assesment tools. WIRIS tools are easily integrated into Moodle and other LMS. You can experiment with all WIRIS tools running in a Moodle environment.
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 Wisconsin Center for Education Research (WCER)  School of Education, Univ. of WisconsinMadison
One of the oldest and largest education research centers in the world, providing an environment where some of the country's leading scholars conduct basic and applied education research. The WCER roster includes nearly two dozen research centers and projects
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 Wisconsin Emerging Scholars Program (WES)  The Math Forum
A program for calculus students designed to boost the performance and persistence of freshman in the UWMadison's 3course calculus sequencea "gateway" course required of students planning to major in science, math, or engineering. The WES program places
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 Wisconsin Mathematics Talent Search  Mathematics Department, Univ. of Wisconsin
Each school year, the Talent Search creates five sets of five problems each and distributes them to high school and middle school students in the state of Wisconsin and throughout the world. These problems are not easy, but their solutions do not require
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 Wise Education and Behavior  Rachel Wise
Educational and behavioral tips on math strategies include "Using Games to Teach Computation"; "Teaching Mental Math"; and "Keywords, Relevant Information, Creating Visuals."
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 Wiskundig Genootschap
The Dutch Mathematical Society, one of the oldest mathematical societies in the world. History of the society, current activities, and calendar of mathematical activities in the Netherlands. Most information is available only in Dutch.
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