 Encyclopedia of Triangle Centers  Clark Kimberling
A searchable catalogue of hundreds of special triangle points (centroid, incenter, Hofstadter points, Yff centers, Apollonius point, etc.), with a glossary, collinearities, graphics, and links to biographical sketches of geometers, geometry software and
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 The Endeavour  John D. Cook
Cook's blog posts, which date back to January, 2008, have included "A Ramanujan series for calculating pi," "Limerick primes," "Twin prime conjecture and the Pentium division bug," "Three surprises with the trapezoid rule," "Where to wait for an elevator,"
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 Engauge Digitizer  Mark Mitchell
Software that takes a digital graph or map, and converts it into numbers. Engauge Digitizer automatically traces curves of line plots and matches points of point plots; handles cartesian, polar, linear and logarithmic graphs; supports draganddrop and
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 Engineering Formulas  eFunda
Formulas, derivations, diagrams, and online calculators. Fluid mechanics topics include the NavierStokes equation, the Bernoulli equation, Reynold's number, pipe friction, manometer, and Venturi flowrate. Mechanics and materials topics: stress/strain,
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 Engineering Mathematics  eFunda
Illustrated by Wolfram Research's Mathematica and organized into arithmetic, geometry, calculus, differential equations, series, elementary functions, special functions, orthogonal polynomials, transforms, numerical methods, statisstics and probability.
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 Engineers Edge
Formulas, design guide, and online calculators. Design and engineering topics include Reynold's number, pipe friction, mechanical tolerances, beam bending, springs, thread stress area, strain gauge application, plastic snap fit application, pressure vessel
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 Engines for Education  Roger Schank, Institute for the Learning Sciences (ILS)
A "hyperbook" written by Roger Schank, Director of ILS, and Chip Cleary, a graduate student, about what's wrong with the education system, how to reform it, and the role of educational technology in that reform. CDROM version and hardcover and softcover
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 English Attack on the Longitude Problem  MacTutor Math History Archives
Linked essay covering the period from the mid17th through the mid18th century, with 9 references (books/articles).
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 The English Name of a Number  Landon Curt Noll
This program will help people obtain the names of very large numbers. You may enter a number or the power of ten you want. It will give you the name, or the digits, of your number in American or English style.
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 Enigmalia. El país de los enigmas
In Spanish or Catalan: Web donde podrás resolver cada semana un nuevo problema matemático/lógico. Estos problemas versarán sobre los enigmalianos, habitantes de un país donde el motor que todo lo mueve es la curiosidad por los enigmas. La publicación
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 The Enigma Machine  Russell Schwager
This Java applet simulates the operation of an Enigma machine, based on the one used by the Germans in World War II to encrypt military messages. With information on the history and workings of the mechanical Enigma machine; a brief description of how
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 Enigmatum, Centre des Énigmes
In French: A tous ceux qui aiment se creuser la tête, de nombreuses énigmes classées
par thèmes: logique, mathématiques, paradoxes etc.. Toutes les énigmes sont
accompagnées de leurs solutions. Des plus petits au plus grands venez
travailler votre
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 Enlaces en español para la matemática / Spanish language math resources  Math Forum
Mathematics and math education resources available online in Spanish, collected by the Math Forum. Categories: Juegos de ingenio/Problems and Puzzles (Brainteasers, games, and competitions); Lecciones y actividades/Lessons and activities (Lesson plans
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 The eNLVM Project: Promoting Student Achievement in Mathematics through Educator Collaboration [PDF]  Pam Buffington, Burt Granofsky, eNLVM Project
This article explores the use of the eNLVM from the perspectives of Curriculum Developer, Math Content Expert, Special Education Professional, and Classroom Teacher. The article paints a picture of how multiple educators can collaborate to use the eNLVM
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 Ensuring Equity and Excellence in Mathematics (NCREL)  Claudette Rasmussen; Pathways to School Improvement
Critical issues in mathematics. Educators and community members are beginning to recognize that most students, including a disproportionate number of women, minorities, and the poor, leave school without the mathematical skills they need to thrive in
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 Entersoft
Instructional videos and slides for sale: Central Board of Secondary Education (CBSE) 10th maths, Vedic mathematics, and more.
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 Entropia.com
The Global Internet Community for Science and Mathematics Distributed Research Computing, Entropia.com is a community dedicated to performing real research on a massive scale using ordinary home and office computers connected through the Internet. Entropia.org's
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 EnviroNET  Space Environment Information  Messore and Chrissotimos; Goddard Space Flight Center
An online service for the space environment community in support of NASA's engineering and scientific goals, providing models and information on the space environment via the Internet. The EnviroNET programming group is staffed entirely by students who
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 eOptimization.com
An informational meeting place for anyone interested in optimization software. Conduct an "application search" to find case studies, press articles, and vendors about the use of optimization in industries ranging from aerospace and apparel to sports and
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 Epistemology and Learning Group  Massachusetts Institute of Technology (MIT)
Constructionism asserts that knowledge is not simply transmitted from teacher to student, but is actively constructed by the mind of the learner, and that learners are particularly likely to create new ideas when they are actively engaged in making external
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 Epson Omega Designs  Khaled Omran
Downloadable software for solving, plotting, and manipulating functions and matrices. Demo free trial versions or purchase Mathwizard, the matrices calculator, and the algebra calculator.
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 Equalis  Equalis LLC
Register for industrialgrade Scilab support and open source software in Scilab, Octave, Sage and R. Equalis also offers membersonly math blogs, discussion groups, and forums; opportunities to meet and collaborate; a career center for math and "mathcentric"
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 Equalities And Inequalities (SMILE)  Perry Lemon, Shoop School
A lesson designed to involve students in discovery; to teach partitioning and equivalency; and to teach the order of fractions. From the Algebra and Trigonometry section of a collection of almost 200 single concept lessons by the Science and Mathematics
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 Equality and Education  The Century Foundation
Links to information examining causes and effects of economic inequality and exploring policy options for redressing such problems as home inequity, summer schooling, integration, educational choice, and others. Topics: Classroom Inequality, School Choice,
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 Equals and Family Math  Franco, Kreinberg; Lawrence Hall of Science, Univ. of California at Berkeley
EQUALS programs provide workshops and curriculum materials in mathematics for teachers, parents, and community members, working to increase access and equity in mathematics for students in traditionally underrepresented groups. There are over forty EQUALS
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 The Equal Tempered Scale and Some Peculiarities of Piano Tuning  Jim Campbell
An article on tuning applications from the Precision Strobe Tuners site. The Phenomena of Sound and the Harmonic Series, with information about Fourier analysis; Beats; The Physics of Ringing Strings; The Evolution of the Equal Tempered Scale; Piano Tuning;
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 Equate: The Equation Thinking Game  Conceptual Math Media, Inc.
Have fun creating equations crosswordstyle. An arithmetic version of Scrabble, Equate is a math board game for family and classroom. Earn higher scores by using division or fraction tiles, or by playing tiles on premium board positions that double or
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 Equations Calculator
Key in equations up to the third degree, then click the blue "calculate" button for this online calculator to find solutions to the unknowns.
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 Equation Search  Octahedron, LLC
Browse common equations in algebra, geometry, trigonometry, calculus, probability, and finance; or perform keyword searches by equation name, variable name, constant name, and category.
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 EquationSheet.com  E. Brian Welch
A searchable database of equations, constants, symbols, and units. Equations listings include Latex code and MathType 5.0 Copy/Paste. Symbols listings include HTML code equivalents. Registered users may store equations, constants, symbols, and units of
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 Equation Solver  Alexey V.Voronin
Midlet "Equation Solver" is a mobile phone app intended to solve systems of linear algebraic equations with real coefficients of the second and third order (with two and three unknowns). System Requirements:
Mobile phone should have a color screen and
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 EquationSolver  Patrick McMordie
Online equation solver. In “real mode”, ES will solve a huge variety of equations in x (single real variable)  for example those involving polynomial functions of unlimited degree, logarithmic, trigonometric, ... . It’ll solve systems of linear simultaneous
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 Equations with Roots 2 and 5  Jim Wilson; Dept. of Mathematics Education, Univ. of Georgia
A Pedagogical Exploration with a Relation Grapher. This paper examines sets of equations that have graphs crossing the xaxis only at 2 and 5.
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 Equipalindromic Numbers  Len Smiley
A description of the expansion of square root of natural numbers into continued fractions, and the strings of palindromes that can emerge from them. With a table of the first 100 natural numbers and their equipalindromic quadratic polynomials.
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 Equipped for the Future: Fundamentals  Equipped for the Future, National Institute for Literacy
Begun in 1994, the National Institute for Literacy’s Equipped for the Future (EFF) initiative started the development of a framework for adult learning content standards. These content standards were constructed to strengthen the ability of adult education
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 Equity & Access: General  Key Issues in Mathematics at The Math Forum
Issues, networks, general Web resources on equity in mathematics. Also entries of specific interest to minorities, women, people with disabilities, and nonEnglish speaking visitors.
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 Equity and Access in Mathematics Education  EXTEND  Perspectives in Mathematics Education
A summary of an EXTEND roundtable held to discuss key issues and questions concerning equity and access in mathematics education in the context of rapidly changing state and local policy. Links to: key themes of outcomes count, principals count, and teachers
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 Equity Center: Selected Publications (NWREL)  Northwest Regional Educational Laboratory
Publications developed by the NWREL Equity Center (Improving Education for Immigrant Students; Preventing and Countering SchoolBased Harassment: A Resource Guide for K12 Educators; The Fourth R: Responsibility  Ensuring Educational Excellence Through
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 Equity Education On Line  The Equity Assistance Center
One of 10 Federal Desegregation Assistance Centers (See DEACs)  provides services in race, national origin, and sex equity, and welcomes the opportunity to provide technical assistance, onsite training, and planning assistance to school districts in
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 EquPlus  Maria Chernenko
An index of math and science equations, rendered in TeX, MathML, png image files, and MathType. Browse categories such as algebra, calculus, geometry, signal processing, trigonometry, and statistics. See also EquPlus's unit conversions, constants, and
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 Eratosthenes Finds Diameter of Earth!  Mary Kay Hemenway, University of Texas at Austin
Students learn to estimate the diameter and circumference of the Earth by repeating Eratosthenes' experiment, exchange measured data and results, and use the Internet to research the mathematical and scientific contributions of Eratosthenes. Hemenway
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 Eratosthenes' Sieve with JavaScript  H. B. Meyer
An interactive animation with JavaScript of the sieve of Eratosthenes, showsing how the prime numbers <= 400 can be "sieved."
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 Eric Buffington
YouTube lessons and other educational math videos by a Pennsylvania cyberschool teacher. See, in particular, Buffington's channels on "Math That Makes you Think," "Math in Real life," and episode 1 and episode 2 of "What Kids Say About Math."
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 Eric Digest 104: Block Scheduling  Karen Irmsher
A 1996 article, with a bibliography: What's wrong with the traditional day? What is Block Scheduling? What are its advantages and challenges? What advice do experts have for making the change?
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 ERIC Digests  Educational Resources Information Center (ERIC)
Digests are short reports on topics of prime current interest in education, targeted specifically for teachers, administrators, policymakers, and other practitioners, but generally useful to the broad educational community. Each offers an overview of
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 Erich's Combinatorial Geometry Page  Erich Friedman
Famous and infamous problems with diagrams and some solutions and proofs. Includes: tree planting problems; circles through points; maximizing squares; triangulating squares; triangulating triangles; lines avoiding squares; lines avoiding points; points
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 Erich's Packing Center  Erich Friedman
A huge collection of packing problems, each explained with graphics. 2D examples include Triangles in Squares, Circles in Squares, Squares in Squares, Triangles in Triangles, Circles in Triangles, Squares in Triangles, Triangles in Circles, Circles in
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 Erich's Puzzle Palace  Erich Friedman
Mathematical puzzles, with solutions, in the following categories: mirror puzzles, number puzzles, hex loop puzzles, path puzzles, battleship puzzles, triangulation puzzles, grid puzzles, criscross puzzles, weight puzzles, and logic puzzles. In particular,
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 Eric's Treasure Trove of Life  Eric Weisstein
A description of John Conway's Game of Life, with a searchable database of definitions and animated examples of possible patterns.
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 Eric Weisstein's World of Scientific Biography  Eric Weisstein. Wolfram Research
The World of Biography briefly outlines the discoveries and advances of over 250 mathematicians, and includes links to publications with more historical details about the individuals. Each notecardlike bio puts a face to the entries in MathWorld, Weisstein's
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