 OberPrima Mathematik  Olaf Hinrichsen
Instructional German language math videos, browseable by klasse or searchable by keyword.
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 .oO worksheeps  Felix Heckert
Generate worksheets of customized math exercises, complete with solutions: basic operations with integers, negatives, and fractions; binomial and quadratic formulas; partial roots; percent calculation; curve sketching; metric; derivations; antiderivatives;
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 OptNet  Michael Jünger; SIGOPT, Deutsche Mathematiker Vereinigung (DMV)
An electronic forum for the optimization community organized by SIGOPT under the auspices of the Deutsche Mathematiker Vereinigung (DMV). The basic services are a weekly digest containing a moderated list of contributions, a unique email address and
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 Place Value Chart  Ulrich Kortenkamp
Tap below this interactive place value chart app's headers labeled "ones," "tens," and "hundreds" to create tokens and begin experiencing bundling and debundling in our decimal number system. Compatible with the Apple iPhone, iPod, and iPad; also available
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 Plastelina Logic Games  Plastelina
Free Flash games include classic constrained "crossing" problems, such as the puzzle of ferrying a wolf, a sheep, and a head of cabbage across a river in a boat that only holds any two of them at once, without leaving the wolf and sheep alone in each
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 Platonic Solids  Rüdiger Appel
Dwnload GIF animations, with shadow effects, of the five Platonic solids. Also available in German.
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 Platonische Körper  Klaus Bernt
Nets of the Platonic solids to fold. Download in postscript format for printing. In German.
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 The Playground of Mathematics  Cilenia
JavaScript practice in addition, subtraction, multiplication, division, time, and comparison ("greater than, equal to, or less than"). Select difficulty, complexity, position of unknown, duration, and other settings. Also available in Russian, Italian,
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 Plusepsilon.de  Marc Palm
Questionandanswer German language platform for undergraduate and graduate math students. Browse or search questions by users, by tags of math topics, and other options. Not intended as a discussion platform, Plusεpsilon rewards participation
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 Poles and Zeros of a Causal LTI System  Manfred Thole
A Java applet that shows the domain of a system whose transfer function has two poles and two zeros. Poles and zeros can be dragged with the mouse. The amplitude response and the phase response are shown along the side. Plot: H(s) may take a while.
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 Poly and Poly Pro  Pedagoguery Software
Mac and Windows shareware programs for exploring and constructing paper models of polyhedra. With Poly, you can manipulate a polyhedral solid on the computer and print out a flattened version (a net) which can then be cut out, folded, and taped, to produce
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 Polyedergarten  U. Mikloweit
Photographs of paper models of uniform polyhedra, prisms and compounds. Versions of the site also exist in German and French.
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 Polyhedra plaited with paper strips  H. B. Meyer
A guide to generating certain polyhedra (Platonian, Archimedian and other solids) by plaiting paper strips (glueless method). In several cases pattern download of the paper strips is possible. In German and English.
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 The postIMO97 web page  Olimpíada Matemática Argentina
Problems and results from the math olympics held in Argentina in July, 1997. Available in English and Spanish, with problems also in French, Russian, German, and a host of other languages.
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 Puzzle Workshop  maths online  University of Vienna, Austria
Make your own interactive "jigsaw," or multiple choice puzzles, to save and run on your own computer or to publish on the web. The Applet puzzle creation page requires Java; the Test puzzle creation page allows greater use of mathematical symbols.
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 Pythagoreisches Tripelprogramm  Heinz Becker
A Java applet that reads a and gives integer solutions of a^2+b^2 = c^2. In German and English.
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 Pythagoräische Tripel (Pythagorean Triplets)  H. B. Meyer
A calculator for Pythagorean triplets, making visible the oneto one correspondence between triplets and certain pairs of relatively prime numbers, and an interesting correspondence with certain sequences of letters A, B, or C. (Javascript is required.)
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 sbParserSDK 3.6 for Win32  Joerg Koenning
A program that provides an easy way to create an sbParser object that can solve mathematical functions of any length. You can declare up to 24 variables (6 with the ActiveXcontrol) that can be defined and redefined, which is useful for fast calculations,
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 ScriviFacile Math Algebra  Alessandro Danieli
Learn basic operations with this readaloud Windows software that colorcodes each arithmetic step. Download a demo; purchase the full version.
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 SMART: Explorapaedia of Statistical and Mathematical Techniques  Richard Sharp, BioSS
A collaborative approach to the production and delivery, via the web, of training in quantitative methods. Modules include: growth curve modelling, antedependence (repeated measures) modelling, analysis of molecular variance, sequential acceptance sampling,
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 Software for mathematics education  Piet van Blokland
Software for mathematical education that draws on David Tall's philosophy of teaching: use Graphic Calculus to visualize, explore, and conceptualize the graph of a linear function; analyze the data and simulations included with VUStat to learn statistics
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 StatiBot  Dominik Heeb
This interactive expert system for solving statistical problems inferentially guides users through data to the proper test method step by step. Also available in German.
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 StatiBot: Your expert system for inferential statistics  Dominik Heeb
An interactive tool for data analysis. Enter your data by hand or copy them from another program, then answer a series of questions. StatiBot will perform appropriate statistical tests, comment on test results, and create graphs. Site includes example
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 Statistik Österreich (Statistics Austria)
Wilkommen bei Statistik Österreich; Presseinformation; Publikationskatalog; Fachbereiche (Text, Tabelle, und Grafik); Formulare/ Downloads. (The Austrian government agency in charge of statistics. Introduction to the agency; press releases; catalog
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 StatistikTutorial  Peter Schill
Guidance on statistical problems and the use of software packages such as SPSS. More, including forums, available in German.
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 StocksQuest (Thinkquest 1998)  Connie, David, Joseph
An educational, interactive site offering free global stock games, especially for educators and contest organizers. Integrated into a realistic global stock market simulation are lesson plans, stock guides, and online investing resources.
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 Swiss Mathematical Society
Membership information; conferences, jobs, news.
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 Teachers Teaching With Technology (T3)
Professional development training in handheld technology for educators at each level. Sites worldwide in a host of different languages. The United States site includes: professional development institutes, courses, and seminars; resources for educators
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 Technische Universität München School of Education
Research, publications, teaching portfolios, and more about the Technische Universität München (TUM) School of Education, which trains teachers for vocational schools and upper secondary schools (Gymnasien) in Germany. See, in particular, the
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 Tewodros Amdeberhan's Electronic Headquarters
Tewodros Amdeberhan studies combinatorics, number theory, special functions, partial differential equations, computer algebra, algorithmic proof theory, and harmonic analysis. His articles on these topics, as well as some unpublished musings, are available
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 ti89.com  Mike Hillwood
TI89, Voyage200, and TiNspire graphing calculator apps for purchase: number theory, geometry, conics, algebra, linear algebra, matrices and vectors, precalculus, trigonometry, calculus, differential equations, discrete mathematics (linear programming,
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 TI89Prog  Mickaël Nicotera
A French database of programs for the TI89, TI92+ and V200 graphing calculators, organized into categories such as math, games, ebooks, pictures, and cours prépa. With an online discussion forum, links to other resources, and more. Available
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 Tiling and Packing results  Torsten Sillke
Packing problems, mostly, in English, with some in German. Packing Polycubes and Polyspheres; Tilings with Matching Conditions; links.
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 UnitJuggler: Online Unit Conversions  Pierre Di Marco
UnitJuggler offers free unit conversions, for distance and length, area, volume, weight and mass, temperature, time, and more.
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 Universal Math Solver  Stanislav Kublanovsky
Software that solves problems of arithmetic, algebra, trigonometry, calculus, and other mathematics. Graphs, tables, and automated verbal and written commentaries — also available in French, Russian, Dutch, German, Italian, Spanish, and Hebrew —
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 Universal Math Solver (UMS)  Severny Ochag International
UMS allows students to solve problems simply by entering them from any source, and provides a complete solution and presentation of the whole calculation process, accompanied by an audio commentary. See a screen shot or download a demo. Available in French,
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 VIAS Encyclopedia  Hans Lohninger, Virtual Institute of Applied Science
An online encyclopedia of science topics, with a Mathematics section as well as a German/English dictionary.
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 Views of the Solar System  Calvin J. Hamilton
A multimedia exploration of the Sun, planets, moons, comets, asteroids, meteorites, and more. Study the latest scientific information or the history of space exploration, rocketry, early astronauts, space missions, and spacecraft through an archive of
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 vismath  vismath GmbH
A shop of math manipulatives organized into "Build & Construct" (such as Fat Brain Toys, Itsphun, Papercraft, Pattern Blocks, PlusPlus, and Zometool); "See & Observe" (films, Mathematician's Dice, Playart magnetic sets, postcards, and wooden polyhedra);
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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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 Working Group Mathematical Logic
 LudwigMaximiliansUniversität, Munich, Germany
In English and German. Contact information, staff, conferences, seminars, and workshops, Ph.D. program, links, articles.
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 Worldometers.info
Counters that display the realtime data on world population (e.g., births this year, births today, deaths this year, deaths today, net population growth for today), government and economics (daily government expenditures toward health care, education,
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 wrotniak.net  J. Andrzej Wrotniak
Includes shareware and freeware programs for Windows written by Wrotniak: scientific and regular calculators, a spherical geometry calculator, a logic and strategy game, a statistics graphing program, and a simple program to compute the area of a polygon.
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 www.caseymongoven.com  Casey Mongoven
In his music, Casey Mongoven works with Fibonacci numbers, related sequences, and the golden ratio. The site includes scores, writings, WAVs, and MP3s among other files available for download. In English and German.
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 www.logic.at  University of Technology, Vienna, Austria
A group in Applications of Formal Logic. This server contains the home pages of
the Institut für Computersprachen; the Abteilung für Anwendungen der formalen Logik; the Kurt Gödel Society; the Vienna Group for Multiplevalued Logics;
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