 Yves Gallot's Proth.exe and Cunningham Chains  Warut Roonguthai
A collection of interesting Cunningham chains of large prime numbers (with a link to an explanation of Cunningham chains), and how to find some of them using Yves Gallot's Proth.exe, a Windows 95/NT program.
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 yyGrams Books: Books, Games, Puzzles  David Zethmayr
Zethmayr presents boundary mathematics to young children, introducing the ideas of logic, proof, and algebra far earlier than is usually attempted. Books, games, and puzzles on this site reinforce these ideas, and Zethmayr presents a seminar and children's
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 Zahlen  Peter Hartmann
A list of many different types of numbers, with references. In German.
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 ZapaGraph  Brain Waves Software
A graphing program for use in the teaching and learning of high school mathematics and Calculus. Features include the ability to transform any
relation, take the nth derivative of any function, and compose any two functions in nine different ways. The
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 Zap Headquarters  Sue and Bob Durante
Sue and Bob Durante offer a wide variety of Math Programs for school assemblies, math nights, workshops and more. Blending magic with Math and teaching many bits of magical fun that use math and will get students to use math outside of the classroom.
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 Zapple Educational Consulting  Ray Appel
Free stuff: math resources, links and math movies in the style of the Mac/PC ads that teach us about math. Great for teachers for math discussion and older students. Also: workshops and other educational consulting services. Descriptions and testimonials
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 ZCA Kaiserslautern  Olaf Bachmann
The Zentrum für Computeralgebra (Centre for Computer Algebra) at the University of Kaiserslautern is a scientific institution of the departments of Mathematics, Computer Science, and Electrical Engineering at the University of Kaiserslautern in Germany.
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 ZDM: Zentralblatt für Didaktik der Mathematik; International Reviews on Mathematical Education
Electronic journal with surveys, book reviews, literature citations, and trend reports on recent topics and issues in mathematics education and computer science education. The current issue and the 5 issues published prior to this one are available to
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 ZDNet University  ZiffDavis
ZiffDavis computer magazine publishers (PCWeek, MacUser, InternetUser, FamilyPC, etc.) sponsor online feebased computer classes and seminars taught on private moderated message boards. Most classes last 48 weeks, teachers have chat "office hours,"
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 Zebragraph  Jonathan Choate
Download Choate's conference speeches, lecture notes, and other resources such as his Exeter courses and talks. "Enriching the Traditional Geometry Curriculum Syllabus" features the Problem of Regiomontanus. Investigations include the tetrahedral geometry
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 Zen Calculus: A Short, Easy Introduction to Calculus  Peter McCauley
An 11page PDF file that establishes the fundamentals of calculus without using infinite series or limits. Suitable for high school students with one year of algebra.
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 Zeno
School and community programs that "reframe math as fun and relevant" through games and other activities. See, in particular, the freely downloadable PDFs for lesson plans of math games such as 10 Pin Limbo, Twinks, and Farkle. Based in Seattle, this
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 Zeno's Paradoxes  Franz Kiekeben
Statements of the following paradoxes: The Racetrack (or Dichotomy); Achilles and the Tortoise; The Arrow; A brief analysis of the motion paradoxes; The Thomson Lamp; Kiekeben's Odd/Even Paradox; Benardete's Paradox of the Gods;
The Paradox of the Spaceship;
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 Zentralblatt MATH Database  SpringerVerlag
A database edited by the European Mathematical Society, the FIZ Karlsruhe, and the Heidelberg Academy of Sciences, and established in cooperation with Math Doc Cell (France). Search for abstracts of papers on any math subject by author, title, classification,
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 Zero in Four Dimensions: Cultural, Historical, Mathematical, and Psychological Perspectives  Prof. Hossein Arsham; University of Baltimore
A critical panoramic view of basic mathematical fallacies surrounding zero, such as dividing by zero, taking the limit, IEEE special floating point, the notion of zero throughout history, when zero is "not there," the origin of infinity and its symbol,
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 Zeroing In on Catalan's Conjecture  Ivars Peterson (MathTrek)
Preda Mihailescu of the Swiss Federal Institute of Technology in Zurich has
proved a theorem that is likely to lead to a solution of Catalan's conjecture, a
venerable problem involving relationships among whole numbers (in 1844, Catalan asserted that,
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 ZeroKnowledge Proofs  John Scammell
"Random thoughts about teaching math" from a high school math consultant who taught math for 18 years prior. Scammell's blog posts, which date back to May, 2010, have included "Lecture Method vs. Peer Instruction," "Mozart’s Dice Game," "Let the Kids
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 Zeta related functions and proof of Riemann's Hypothesis
Recent studies on Zeta functions and a proposed proof of Riemann's Hypothesis. Theorem of El'Melik; Proof of "Riemann's hypothesis" by above identities; Other Zeta related functions.
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 ZetaTrek  Rohit Gupta
An "online expedition of science and math hobbyists across the world," ZetaTrek mobilizes citizen scientists to promote the history and culture of mathematics, and involves them in research, with particular emphasis on solving the Riemann Hypothesis.
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 ZhiWei Sun's Home Page  ZhiWei Sun
Prof. ZhiWei Sun works in the field of combinatorial number theory. Some of his papers and some surveys for nonexperts are available in postscript form from this page.
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 Zimaths  University of Zimbabwe
An electronic maths magazine with clever, amusing articles written to supplement the resources available to Zimbabwean students, most of whom do not have access to extrasyllabus information. Features include: How number plates and ISBNs work; Statistical
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 Zoltan Dienes' Web Site  Zoltan Dienes
"Math through play" from a developer of psychomathematics, multibase blocks, and the sixstage theory of learning mathematics. Freely download PDFs of Dienes' Ruritania stories and math games such as Strip Mathematics, Circular Villages, Six Stages with
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 Zoma's Land O'Logic  David and Zoma Stern
Who Rode the Goat? A logic puzzle with many clues and a link to the answer.
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 Zombie Cat  Diego Fonstad
Zombie Cat shares learning catalysts  those "perfect stories, explanations, or methods to teach complex mathematical and scientific concepts." Insightful math learning catalysts date back to January, 2011, with categories such as "Videos worth watching"
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 Zome Geometry: Handson Learning with Zome Models  George W. Hart
An upcoming book full of things you can make with the Zome System geometry construction set  a handson guide to the geometry of threedimensional space. Contents include: Angles, Polygons, Polyhedra; Icosahedron and Dodecahedron; Platonic Solids; Counting;
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 Zome System  Zometool, Inc.
Available in kits of various sizes, Zometool is a 31zone design tool and educational toy for kids, hobbyists, students, teachers and researchers. Precisionmolded in ABS plastic, Zometool models spatial structures representing hyperspaces of up to 31
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 Zome: Truncated 120cell  PCMI @ Math Forum: SSTP 2007
One of the activities at the 2007 Secondary School Teachers Program in the Park City Mathematics Institute was the construction of a truncated 120cell using Zometool. View both an explanation of the mathematics and photos of the construction.
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 Zona Land: Education in Physics and Mathematics  Edward A. Zobel
Text, Java, and VRML worlds demonstrating mathematical concepts in graphs, functions (including linear and polynomial), geometry, and trigonometry, as well as physics lessons on a similar model.
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 Zone Out! (SMILE)  Willie Mae Wilson, Hartigan Elementary School
A lesson for grades K3 designed to review previously taught concepts of time, hours and 1/2 hours; and to help children with the concept of the four different standard time zones in the 48 states. From the "Miscellaneous" section of a collection of almost
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 Zooba Island  Vrilliance Solutions
Free Flash games for children aged 7 to 12 which "inject fun and excitement into learning mathematics." Developed in consultation with Singapore's Ministry of Education Curriculum Planning Department around the Singapore mathematics curriculum, games
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 Zoomin Calculus  Susan J. Northridge
Short instructional videos for students in calculus and precalculus. Topics include algebra, unit circle, natural logarithms, exponents, limits, derivatives, applications of differentiation, integrals, and more.
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 Zoom Math  I.Q. Joe
The makers of Zoom Algebra, an application with an intuitive visual interface and numerous typing shortcuts. Their apps for TI83 Plus or TI84 Plus graphing calculators let you "type problems in just the way they look in your textbook, and then they
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 ZooWhiz  EdAlive
A curriculumlinked learning system for parents and teachers of children ages 515. Sample fun, colorful learning activities for math, word skills, and reading before registering a free "keeper" account or purchasing a premium "zoologist" subscription.
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 Z's Roguelike Stuff  Zeno Rogue
Mathematical games and projects include HyperRogue, a treasurecollecting, goblinkilling adventure set in nonEuclidean space  specifically, a hyperbolic plane of negative curvature filled with elixirs and slime beasts; and Hydra Slayer, which begins
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 Z Systems, Inc.
Developers of data analysis, acquisition, and visualization software. Evaluation copies available for download. Graphing and data analysis software includes Graph++, a graphing application that evaluates equations and mathematical functions graphically.
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 Zêtre  Arte Merritt
A card game for the whole family that combines math, an element of chance, and a time limit. Players can compete against each other, against the clock, or against themselves. Zetre helps enhance players' math skills, including their knowledge of the order
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 Zuk  Jan Bobrowski
Download an experimental version of a dynamic Mandelbrot/Julia fractal viewer for DOS.
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 Zunzun.com Online Data Modeling  James R. Phillips
Curve and surface fit 2D and 3D data online with a rich set of error histograms, error plots, curve plots, surface plots, and contour plots. The site also has a "Function Finder" to help determine the best equation to fit data.
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