- Entropic Groupoids (Catalogue of Algebraic Systems) - John Pedersen, W. Edwin Clark; Dept. of Mathematics, University of South Florida
Definition, examples, and references about entropic or medial groupoids. Links to related terms in the Catalogue.
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- Enumeration of the Binary Trees (Catalan Numbers) - Ivan Galkin
For each number of nodes, n, there is a certain number of possible binary tree configurations. These numbers form a sequence of integers with respect to n. A useful way to describe an integer sequence is to construct a generating function...
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- Environmental Issues: A Mathematical Modeling Approach - Jan Pearce, Mathematics and Computer Science Department, Berea College
Assignments, syllabus, and other classroom materials for this course that discusses the state of the planet. "Local and global issues such as air, land, and water pollution; energy production and consumption; forest, wetland and other resource management;
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- EnVision: A tool for live web-based communication in the mathematical sciences - Marco Pollanen
EnVision is a Web-based whiteboard-chat program that assists in the live communication of mathematical content. It has been used to conduct online office hours in introductory courses. It allows students to log in anonymously and thus reduce anxieties
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- e-Optimization.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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- 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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- EQUADIFF 10 - Ivo Babuska, Jaroslav Kurzweil, Honorary Presidents
Czechoslovak International Conference on Differential Equations and Their Applications Prague, 27-31 August 2001. See the Announcement for information about the venue, program, registration, accommodations, etc.
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- Equalis - Equalis LLC
Register for industrial-grade Scilab support and open source software in Scilab, Octave, Sage and R. Equalis also offers members-only math blogs, discussion groups, and forums; opportunities to meet and collaborate; a career center for math and "math-centric"
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- Equal Sums of Like Powers - Chen Shuwen
An extensive collection of equal sums of like powers, especially those that are solutions to multigrade equations.
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- Equal Sums of Like Powers - Chen Shuwen, People's Republic of China
On the integer solutions of the Diophantine system.
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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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- 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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- Equation Wizard: Algebraic Equation Solver - Bogdan Kobets
The program allows you to solve algebraic equations in the automatic mode. You just enter an equation in any form without any preparatory operations. Step by step Equation Wizard reduces it to a canonical form performing all necessary operations. After
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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 non-English speaking visitors.
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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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- EqWorld: The World of Mathematical Equations - Andrei D. Polyanin, editor
Extensive information on solutions to various classes of algebraic, ordinary differential, partial differential,
integral, and other mathematical equations. It also outlines methods for solving equations, includes interesting articles, gives links to
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- The Erdos-Strauss Conjecture (ESC) - Allan Swett
The conjecture states that that for any integer n > 1 there are integers a, b, and c with 4/n = 1/a + 1/b + 1/c, a > 0, b > 0, c > 0. The page establishes that the conjecture is true for all integers n, 1 < n <= 10^14. With links to
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- The Erdös Number Project - Jerry Grossman
Paul Erdos wrote hundreds of mathematical research papers in many different areas, many in collaboration with others. His Erdos number is 0. Erdos's co-authors have Erdos number 1. People other than Erdos who have written a joint paper with someone with
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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, cris-cross 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 notecard-like bio puts a face to the entries in MathWorld, Weisstein's
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- ESAIM: P&S - Probability and Statistics - EDP Sciences
An electronic journal created to publish original research and survey papers in the area of probability and statistics, covering theoretical and practical aspects in any field of these domains. Of particular interest are methodological developments with
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- Escher and the Droste effect - B. de Smit and H. W. Lenstra Jr., Mathematisch Instituut, Universiteit Leiden, the Netherlands
Applying mathematics to Escher's Print Gallery. A mathematical analysis of Escher's "The Print Shop," including an image of the original print. See the article (PDF format) Artful Mathematics: The Heritage of M.C. Escher in the Notices of the AMS, bringing
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- Escher Tiles - Hop David
Tessellations that resemble recognizable objects, created by the author in the style of M. C. Escher.
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- Escher Web Sketch - Wes Hardaker, Gervais Chapuis; Univ. of Lausanne, Switzerland
A Java applet that allows you to draw repeating patterns. With documentation on how to use the applet, a pattern archive, the authors' favorite patterns, a link to download Escher Web Sketch, the program's source code, and interesting crystallographic
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- Eskimo Pi - Keith Devlin (Devlin's Angle)
"As everyone knows, in the last century, the State of Indiana passed a law legislating the value of pi to be 3. Well, perhaps it's a bit of an exaggeration to say that everyone knows it, but most people do. But that alone is very odd, since it is not
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- Espaces Fibrés et Connexions - Robert Coquereaux
Un livre de géométrie différentielle en hypertexte; une introduction a la théorie des espaces fibrés et des connexions. A hypertext book in French on differential geometry.
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- Essay Ideas - Jim Wilson, Dept. of Mathematics Education, Univ. of Georgia
For a course on Using Computers in Mathematics Instruction. Friday the 13th (show there are at most three and at least one Friday the 13th in each year, consider when two consecutive months can be have Friday the 13th); Gingerbread Man (a Microsoft Excel
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- An essay on patterns in musical composition, transformation, mathematical groups and the nature of musical substance - Bill Hammel
An article on music composition and history, with a discussion of the organizing principles of various musical scales as they affect musical composition and links to related sites.
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- Essays on Constructivism and Education - Tom O'Haver; Maryland Collaborative for Teacher Preparation
An extensive collection of articles on constructivist teaching strategies, change in education, technology in the classroom, hypertext and cognitive flexibility, constructivist pedagogy readings, and more.
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- Estadistika - SINCOW
Software for statistical analysis written in PHP: includes measures of central tendency, frequency distributions, median, mode, average, graphic results, surveys online. Free trial version. Free online calculator also available.
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- Ethical Guidelines (AMS) - American Mathematical Society
Guidelines prepared by the Special Advisory Committee on Professional Ethics, (Murray Gerstenhaber, Frank Gilfeather, Elliott Lieb, and Linda Keen, chair), and adopted by the Council in the Spring of 1995 in the name of the Society. Topics address: Mathematical
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- Ethics in Science - Dept. of Chemistry, Virginia Polytechnic Institute
A bibliography of publications that pertain to ethics and misconduct in science; Internet-based resources related to ethics and misconduct in science, including hyperlinks to online professional codes of conduct; Selected Essays on Ethics in Science (the
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- Euclid
A VRML based project that demonstrates the construction of the five Platonic Solids from Book 13 of Euclid's Elements. The aim of the original Euclid project was to provide a clearer sense of the classical geometry of Euclid's Elements. It is hoped that
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- Euclid and his Elements - Donald Lancon, Jr.; University of Houston
A paper written for a Survey of Math class at Bellaire High School(Bellaire, Texas): a discussion of what is known about Euclid's life and his works other than the Elements, followed by a systematic study of the Elements, examining its content, structure,
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- EuclideanSpace - Martin Baker
Introductions to algebra, geometry, calculus, discrete math, and statistics, particularly where relevant to 3D programming. In each subsection, Baker lays out notation and defines key terms to the right, in grey boxes with brown headers.
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- Euclid Lab
This California-based nonprofit operates Camp Euclid, a mathematics research camp for high school students, as well as a sister program for junior and senior researchers (MRPU). See also Euclid Lab's "math blog written for all," Unsolved:, which discusses
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- EucliDraw - Kostas Pamfilos, George Nikoloudakis, and Paris Pamfilos
A program to draw plane Euclidean geometry figures. Features include an extensible toolbox, animations, Euclidean and arbitrary transformations, a catalogue of triangle-center-tools, Scheme-Sockets to combine and generate complicated schemes and fractals,
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- Euclid's Elements - David Joyce; Dept. of Mathematics & Computer Science, Clark University
A version of Euclid's Elements created by David Joyce to rekindle an interest in the Elements and to show how java applets can be used to illustrate geometry and to bring the Elements alive. The text of all 13 Books is complete. Joyce writes: "...deductive
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- Euclid's Fourteenth Book - Ivars Peterson (MathLand)
Officials of the Foundation for Old Occidental Languages announced today that, after a year devoted to authentication and analysis, they are prepared to release the text of a manuscript that appears to be a Latin translation of research notes jotted down
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- Euklides - Peter Simon
Dynamic geometry shareware for two-dimensional geometry; besides the basic elements, Euklides supports conics and point tracking (locus, cycloid). The multi-layer capability ensures easy and efficient construction of drawings. The software produces precise
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- EUKLID - Roland Mechling
Dynamic geometry shareware in German and English. Create geometrical constructions on the screen just as on paper; then take a point in your drawing and drag it to another place, and the geometrical relations between all of the objects will be preserved.
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- Euler 2007
A celebration of Euler's 300th birthday in April 2007. Papers and abstracts from the various symposia and colleges are archived here, and further links to resources and web pages are offered.
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