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 Does the Number e have Special Meaning? - Spencer, Chan; Univ. of Toronto Mathematics Network Answers, explanations, and expositions of the question, Does the number e have any real physical meaning, or is it just a mathematical convenience? Addresses the topics: Simple and Compound Interest; A Physical Meaning for the Number e; The General Situation; ...more>> Doing Mathematics - Bryan Meyer Blog by an eleventh grade math teacher at a project-based learning (PBL) school pursuing a Masters Degree in Teacher Leadership. Posts, which date back to February, 2012, have included "What Bowflex Can Teach Us about Assessment," "Habits of a Mathematician," ...more>> Domain and Range of a Function - Math Forum, Ask Dr. Math Common Question A selection of answers to questions about the domain and range of a function, as well as determining the domain and range of a function from its graph. ...more>> Domebook - Tom Camilli Cardboard and transparent plastic geodesic domes built by children. Students start by constructing paper models, then apply scale factors to construct domes of any size using cardboard or wooden dowels and plastic sheeting. See pictures of classroom projects; ...more>> Dominoes Activity - Suzanne Alejandre A classroom activity (similar to Pentomino + 1 = Hexomino; a variation on polyominoes) aligned to the NCTM and California Standards, to be explored through manipulatives (paper dominoes). Students explore whether it is possible to cover a 6x5 grid with ...more>> Donald Coxeter, Mathematician and Geometer - Great Canadian Scientists (GCS) Harold Scott MacDonald Coxeter, Professor Emeritus, Math Dept., Univ. of Toronto, is best known for his work in hyperdimensional geometries and regular polytopes - geometric shapes that extend into the 4th dimension and beyond. In 1926 he discovered a ...more>> donalduncan's Channel Narrated paper and pencil instructional videos -- some, specific to British Columbia's Foundations of Math and Precalculus exams -- on number, line segments and lines, rational expressions, factoring, quadratic functions, functions, exponents, polynomials, ...more>> Don Knuth's Home Page - Donald E. Knuth, Stanford University From the author of The Art of Computer Programming. "Computer Musings" chronologically documents Knuth's informal lectures at Stanford. It also links to Musings Online, digitized versions of videos from the lecture series that included Dancing Links; ...more>> Don't Hate No Math - Elio Motella Advice for students, parents, and teachers. The document called "Lecture" includes sections such as "The causes of your troubles," "It's called metacognition," and "Mental models and propositional representations"; see in particular Part D, titled "An ...more>> Doodling and Miracles - Cut the Knot!, Alexander Bogomolny Almost 100 years ago, Frank Morley proved a curious theorem from elementary geometry that had remained unknown until 1899. With time, the theorem became known in mathematical folklore as Morley's Miracle (Morley's Trisector Theorem is a more mundane term.) ...more>> The DOR: Home of the Direct Opposite Reverse - David P. Sterner Sterner developed this shape, which he calls a geometric "missing link", and has applications as a lens. ...more>> Doron Zeilberger's Electronic Headquarters Doron Zeilberger researches combinatorics using computer programs. The site is notable for his Opinions page; these opinions are wide-ranging but touch upon mathematics education, the use of computers, and the value of incomplete proofs. All of Zeilberger's ...more>> Do software engineers need mathematics? - Keith Devlin (Devlin's Angle) Software engineers don't use their college mathematics, but they make use of their college mathematics education every day. Brains are perhaps the world's best examples of an adaptive system. When we subject the human brain to an extended educational ...more>> Do the Math - Slate A topical series about math in culture, politics, psychology, and other popular themes, many written by math professor Jordan Ellenberg. Articles, which date back to June, 2001, have included "Barry Bonds and the Placebo Effect," "Algebra for Adulterers," ...more>> Dot Patterns and Sierpinski Gasket - Cut the Knot!, Alexander Bogomolny How many ways are there to define the Sierpinski gasket (also, the Sierpinski triangle)? The author has counted a respectable 9 but would be happy to learn of more. An applet with rows of digits or circles with colors corresponding to the digits shows ...more>> Dots and Boxes - Ivars Peterson (MathTrek) The familiar pencil-and-paper game of Dots-and-Boxes can be played on several different levels of sophistication. Elwyn Berlekamp posits that the game can be played on at least four different levels. "Players at any level consistently beat players at ...more>> Double Bubble Conjecture Proved (Math Chat) - Frank Morgan, MAA Online Four mathematicians have announced a mathematical proof of the Double Bubble Conjecture: that the familiar double soap bubble is the optimal shape for enclosing and separating two chambers of air. In an address to the Undergraduate Mathematics Conference ...more>> Doubling Pennies - Math Forum, a Classic Problem from the Ask Dr. Math FAQ Which is more, a million dollars or a penny doubled every day? ...more>> Doubling the Cube - MacTutor Math History Archives Linked essay covering the history of and some solutions to the classical problem in Greek mathematics of doubling or duplicating the cube, also called the Delian problem; and on proving the impossibility of constructing a solution using only ruler ...more>> Doug's Home Page - Douglas J. Ingalls Includes mathematical interests such as images of fractal applications of Newton's Method and Gibb's Phenomena, with related programs in FORTRAN and BASIC, a discussion of the apparent depth problem in optics, and how multiple decisions can be reduced ...more>> Downloadable Articles, Papers & Materials - Michael de Villiers; Mathematics Education, Univ. of Durban-Westville, South Africa Articles by Villiers related to geometry and geometry education some in PDF format, including: An Extended Classification of Quadrilaterals; A Mathematical Treasure Hunt; Place Kicking Locus in Rugby; Sketchpad Solutions and Results; A Dual, and Generalizations, ...more>> Downloads - Mac - Mathematics - CNET Download.com Search this site to find a particular piece of software for the Mac, or browse their mathematics listings. ...more>> Downloads - PC - Mathematics - CNET Download.com Search this site to find a particular piece of software for the PC, or browse their mathematics listings. ...more>> Do You Know That... - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny A collection of short essays about over 60 curious mathematical facts and terminology, mostly linked to explanatory or exploratory essays, drawn from various parts of Bogomolny's site, Cut-the-Knot. See page two and page three. ...more>> doyourmath.com Interactive practice and learning tests (Pre-SAT, SAT, AP and Calculus), math puzzles, entertaining math for all ages, a math bookstore, and a math expert to answer your questions. Submit your answers to the puzzle of the week and see the archive of past ...more>> A Dozen Reasons Why Schools Should Avoid Filtering - From Now On (FNO) Why schools should not block access to particular sites: filters may not work very well;. they may work too well; they may increase attention to SMUT and spur motivation; their ongoing cost may block better programs from your students; they may create ...more>> DPGraph (Dynamic Photorealistic Graphing) - David Parker Software that allows you to: display multiple simultaneous dynamic photorealistic 3D implicit equalities and inequalities, and intersections of their volumes; spin, slice, and view time-dependent (moving) photorealistic surfaces in real time; and construct ...more>> Dragonfly Web Pages - Miami Univ. of Ohio with the NSTA Dragonfly is an inquiry-driven magazine published bimonthly during the school year, inspiring children to join with their peers and with scientists in national and international investigations. Dragonfly also publishes poetry, autobiographies, natural ...more>> Draining The Swimming Pool (SMILE) - William Byrne, Martin Luther King High School A lesson that offers experiments that suggest a way to solve the general work problem: If A can do a job in X hours and B can do the same job in Y hours, how long will it take A and B working together to complete the job? From the Algebra and Trigonometry ...more>> Dramatic Results This non-profit educational arts agency improves students' academic confidence and performance "by stimulating curiosity and fostering creativity through a hands-on, arts-based approach to learning." Dramatic Results specializes in curriculum that integrates ...more>> Drawing a Crop Circle - IES Ramon Cabanillas (Cambados, Pontevedra, Spain) To draw a crop circle, the high school students at IES Ramon Cabanillas (Cambados, Pontevedra, Spain) calculated ellipses and discovered the pentagram's relation to the golden mean. This website details their designs, practice, calculations, and final ...more>> Drawing on Math - Tina Cardone Blog by a public high school math teacher in Massachusetts who has participated in Boston University's PROMYS and the Institute of Advanced Studies' PCMI. Posts, which date back to August, 2011, have included "End of Year Reflections: Geometry Favorite ...more>> Drawing Tools - Shai Duvdevani A growing group of .NET C# programs intended to make life easier for highschool and university students studying subjects such as math, computers and electronics. Each of these programs features saving and loading, so that sharing a drawing of logical ...more>> DreamCalc for Windows - Andy Thomas A freeware scientific calculator for Windows, intended to replace standard hand-held calculators. Fully featured range of math, scientific, statistical & financial functions. Supports natural fractions, complex numbers, base-n logic, unit conversions ...more>> Dream Car Math - Jan Rottner; SCORE Mathematics Collect price statistics on the Internet for purchasing 2 "dream cars" and calculate profits and differences in base price compared to the manufacturer's suggested resale price. Calculate monthly payments and compare calculated results using greater than, ...more>> Dream Frequency .com CGI web applications to calculate the factors of a number, calculate the prime numbers below a number, test a number for primality, calculate a word's position in the alphabetically sorted list, convert hex to ASCII, or convert temperature from celsius ...more>> Dream Home Mathematics (SMILE) - Dennis W. Montgomery, Lyman Trumbull Academy A lesson for grades 5-12, designed to teach students to use basic math to determine affordability of a home based on a given income; calculate decimal placement for currency, percentages and interest; estimate affordability based on income; investigate ...more>> Dr. Genius - Hilaire Fernandes Dr. Genius: "Geometry Exploration and Numeric Intuitive User System." The successor of the Dr. Geo Project, this GNU interactive geometry software allows the construction and manipulation of geometric figures. Read documentation, subscribe to the mailing ...more>> Dr. Hanley's Science Graphs - Patrick Hanley A Windows software package for graphing data and equations in the form y=f(x) and x=f(th); y=g(th) using a PC. The program can also be used to graph up to 1,000 x-y data points from an ASCII file, to graph color contour curves from equations and data ...more>> The Drills To Play - Cut the Knot!, Alexander Bogomolny An exploration of a detail found at the beginning of Kurt Godel's biography by John Dawson, how repetition and practice constitute an integral and necessary part of the learning process; that, by implication, one first conceives an idea, then proves it ...more>> Dr Len Fisher: Opening the Door to Science - Len Fisher Fisher concentrates on the science of the everyday and making science accessible. His latest book is Rock, Paper, Scissors: Game Theory in Real Life. The site contains excerpts from his books as well as descriptions of his talks, articles about his work, ...more>> Dr. Math Books - the Math Forum @ Drexel Featuring Internet references, glossaries, indexes, illustrations, and questions written by actual kids, each can be purchased from Amazon.com via links on this page. The page details the contents of each book: Dr. Math Gets You Ready for Algebra, Dr. ...more>> Dr. Rich's Page o' Math Math problems in algebra, trigonometry, and calculus, posted more or less monthly (past puzzles, with solutions, are on the Web). ...more>> Drums That Sound Alike - Ivars Peterson (MathLand) Peterson writes that physicists and mathematicians have long recognized that the shape of the boundary enclosing a membrane plays a crucial role in determining the membrane's spectrum of normal-mode vibrations. He outlines the progress made on Mark Kac's ...more>> Dueling Pinwheels - A Geometer's Sketchpad Activity - Cynthia Lanius Construction directions for rotations, translation, and reflection, with questions to explore and a demonstration sketch to download. ...more>> Duke University Math Union - Jadrian Miles The Duke University Math Union (DUMU) writes and hosts the annual Duke Math Meet. Download PDFs of problems and solutions from meets dating back to 1998. ...more>> Dunham's Math Dictionary - Charlene Dunham More than 300 Algebra and Geometry math terms, to accompany Charlene Dunham's other pages of course activities (advanced and honors geometry) for Lee Freshman High School. ...more>> dy/dan - Dan Meyer Meyer has taught high school math since 2004, and blogged about it since September, 2006, with two interests in particular: curriculum design (answering the question, "how we design the ideal learning experience for students?") and teacher education (answering ...more>> Dynagraph - Rouben Rostamian, University of Maryland, Baltimore County Dynagraph is a 3D plotting utility for the X Window System. It draws 3D curves and surfaces representing mathematical expressions and numerical data, and allows for interactive rotation, zooming, and other manipulations of the displayed images. Read the ...more>> The Dynamical Systems and Technology Project at Boston University - Robert L. Devaney; Dept. of Mathematics An NSF-sponsored project designed to help secondary school and college teachers of mathematics bring contemporary topics in mathematics (chaos, fractals, dynamics) into the classroom, and to show them how to use technology effectively in this process. ...more>>
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