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  All Sites - 6989 items found, showing 5301 to 5350

  1. PUERTRA - Javier Sánchez González
    The software package PUERTRA implemented a theoretical study of formal properties of Islamic geometrical art. PUERTRA modeled the Islamic rectilinear interlaced lattices found extensively in wood work (artesonado ceilings, mosque minbars, doors and windows, ...more>>

  2. Punctured Polyhedra - Ivars Peterson (MathTrek)
    A tetrahedron has four triangular faces, four vertices, and six edges. When a vertex of one tetrahedron pierces the face of a second tetrahedron it forms a new, more complicated polyhedron: one triangular face has a triangular "hole" where the face was ...more>>

  3. PuraMate
    Ejercicios e soluciones de ecuaciones de primer grado, ecuaciones de segundo grado, algebra de Baldor, polinomios, producto y cociente notable, binomios, trinomios, desigualdades, y inecuaciones. Un blog empezó en octubre, 2014, tiene entradas ...more>>

  4. Pure Math Online
    Pure Math Online uses live, personal tutors to help students with algebra and other math homework in real time over the Internet. Program information and signup for free demo are available on the site. ...more>>

  5. Purplemath - Your Algebra Resource - Elizabeth Stapel
    Algebra modules provide lessons, practical tips, hints, worked examples, and point out common mistakes in basic triangle length (trigonometry) values, calculators (what model to buy), canceling units, domain and range, exponents, factoring quadratics, ...more>>

  6. PuzzleBeast - James W. Stephens
    A collection of computer-generated puzzles, some illustrated with Java applets, some with solutions included: The Fried Okra Perplexity, A Dozen Irritating Sliding Block Puzzles, The Bulbous Blob Puzzle, Meandering Monk Maze, The Kung Fu Packing Crate ...more>>

  7. Puzzle Choice
    A wide choice of puzzles and games for all ages, including crosswords, wordsearches, brainteasers, number puzzles (a calculator is provided), logics, teacher resources and other online games, including mazes. ...more>>

  8. Puzzle explorer - Wade Philpott
    Links to mathematical games invented by Philpott and now for sale: Multimatch and Leap (originally Sweep). ...more>>

  9. Puzzle Fun - Rodolfo Kurchan
    An online newsletter edited by Rodolfo Kurchan (Buenos Aires - Argentina) about polyominoes and other puzzles. Back issues are on the Web. ...more>>

  10. Puzzlemaker - Discovery Education
    A puzzle generation tool for teachers, students and parents. Create and print customized puzzles, including math squares and number blocks, online, or buy a CD with editing tools and other extras. ...more>>

  11. Puzzle of the Week - Ralph Grove
    A small archive of math and word puzzles having to do with patterns, permutations, and probability, with solutions, from a professor of computer science at Indiana University of Pennsylvania. ...more>>

  12. Puzzle Page - The Black Stump Ltd.
    More than 150 links to puzzle sites on the Web. A new site is added each week. ...more>>

  13. Puzzler - Franklin Institute Online
    Puzzles from the inQuiry Almanack Puzzle Archive: e.g. Cryptograms, January, 1998. Coded messages hide famous quotations. A clue is offered to begin breaking the code, and an answer key is provided. One puzzle a month from March of 1995 through July of ...more>>

  14. Puzzlers - Bryan Clair, University of Chicago
    A collection of Clair's favorite puzzles (no discussion or answers are provided): The Nine Dots; Weighing Coins; The Dollar Hotel, Planning an Orchard; The Math Department; Tea and Cream; Bugs on a Square; River Crossing; More Crawling Bugs; The Unexpected ...more>>

  15. Puzzles
    A blog of math puzzles. Post your answers in the comments sections. ...more>>

  16. Puzzles - Martin Watson
    Blogs, comments, musings, design sketches, and photographs of mechanical puzzles by an avid collector and craftsman. Puzzle news, the author's own burrs (Watson's wormhole, digigrams, Dutch cubist), in-depth explorations of manipulative puzzles (Puzzles ...more>>

  17. Puzzles of Leonid Mochalov - Leonid Mochalov
    Numerical and visual puzzles, some in Russian only, most in English. ...more>>

  18. Puzzles/One-player Games - Jürg Nievergelt
    Rubik's Cube and its variants. The 3*3*3* cube; Rubik's Revenge (4*4*4 cube); Pyramix (tetrahedron); Rubik's Clock; Rubik's Magic. Also Cryptequations, polyominoes, and links to a list of similar puzzles. ...more>>

  19. Puzzles, & Riddles - The Contest Center - Frank Rubin
    Hundreds of puzzles and mathematical problems ranging from kindergarten through post-doctoral levels. For the easier puzzles, answers are provided on the site; names of those who submit correct solutions to harder problems are posted. See also Puzzles ...more>>

  20. Puzzle Toons, The Citizen Scientist - Brian Mansfield
    A comic strip devoted to puzzles, mind benders, and brain teasers. The subject matter of the puzzles ranges from mechanical devices and geometry to astrodynamics, chess, and billiards. Read back issues of Mansfield's column, dating to its inception in ...more>>

  21. Puzzle University - Amy Galitzer
    A non-accredited "university," created solely for fun. Everything is free to play and take part in. Register, pass a simple test, and advance from freshman to sophomore to junior to senior to grad student this way. The puzzles get harder as you progress. ...more>>

  22. Puzzle Up - Binary Arts Corporation
    A collection of others' Java puzzles, baffler and logic questions, "for serious puzzlers," best of the week, and mazes and mysteries, each organized into the three different skill levels of young, brisk, and expert. Also, information on the company's ...more>>

  23. PuzzleUp - Emrehan Halici
    New problems and games posted every week in a contest format. Register, read the competition's rules, and browse the archive of past problems. ...more>>

  24. 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. ...more>>

  25. Puzzle World - John Rausch
    A searchable site with information and a discussion group (Puzzle Talk) about handcrafted mechanical puzzles. Most of the puzzles presented here are not the mass-produced variety found in stores, but limited production puzzles produced by craftsmen (often ...more>>

  26. Puzzle Zapper - Alexandre Owen Muñiz
    Original mathematical puzzles, some available in lasercut acrylic for sale: polyomino common superforms, pentomino coloring problems, miscellaneous polyomino explorations, flexible polyforms, square grid puzzles, visualizing sequences of numbers, Lissajous ...more>>

  27. Puzzlies.net - Michał Barciś
    Play sudoku and griddler logic puzzles online. Log in to save game play and compete in the rankings. ...more>>

  28. Puzzling Lines - Ivars Peterson (MathTrek)
    Sol LeWitt has often featured geometric and combinatorial themes in his sculptures, paintings, and drawings. In 1973 he composed "Straight Lines in Four Directions and All Their Possible Combinations," a grid of 15 squares, each inscribed with one or ...more>>

  29. Puzzling Primes - Isaac Reed
    To fully comprehend our number system, mathematicians need to understand the properties of the prime numbers - but even finding them isn't so easy. ...more>>

  30. The Puzzling World of Barry R. Clarke - Barry R. Clarke
    Brain teasers from Clarke's column in The Daily Telegraph (UK) and from his various puzzle books: liar problems, logic teasers, number conundrums, matchstick puzzles, lateral mind-benders, and more. With links to other puzzles sites and an article on ...more>>

  31. PyGeo - Arthur Siegel
    A dynamic geometry toolset written in Python, with dependencies on Python's Numeric and VPython extensions. It defines a set of geometric primitives in 3d space and allows for the construction of geometric models that can be manipulated interactively, ...more>>

  32. Pyramid and Frustum Formulas (Ask Dr. Math FAQ) - Math Forum
    Formulas for finding the surface area and volume of a pyramid and its frustum. ...more>>

  33. Pyramids and Algebra - David C. Miller
    Four questions that explore the problem of creating a pyramid from a set of dominoes, dealing with the concepts of arithmetic series; derivation of square roots including a graphical method; scientific notation; exponential notation; quadratic equations; ...more>>

  34. Pythagoras' Haven - Jim Morey
    Step through a geometrical Java applet proof of the Pythagoraean theorem - the square of the hypotenuse of a right triangle is equal to the sum of the squares of the other two sides. ...more>>

  35. Pythagoras: Music and Space - J. Boyd-Brent
    A brief introduction to Pythagoras' observations on the relation between music and number. Graphics show music intervals expressed as mathematical ratios. Pythagoras observed that when the blacksmith struck his anvil, different notes were produced according ...more>>

  36. Pythagoras Plays Ball - Ivars Peterson (MathLand)
    Spring, baseball, statistics, math. In many ways, baseball is a numbers game: Strikeouts, home runs, batting averages, innings pitched, complete games, earned run averages, number of players left on base in scoring position in the bottom of the ninth ...more>>

  37. Pythagoras' Theorem: Elaboration on the Similarity Argument - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
    Euclid included two proofs of the Pythagorean theorem in his Elements. A better known Proposition I.47 (Bride's chair) and VI.31 which is consistently overlooked in the introductory geometry courses. The latter, however, renders the theorem virtually ...more>>

  38. Pythagoras' Theorem in Babylonian Mathematics - MacTutor Math History Archives
    Linked essay examining four Babylonian tablets that all have some connection with the Pythagorean theorem. With references and other related web sites. ...more>>

  39. Pythagorean Puzzle (SMILE) - Earl Zwicker, Illinois Institute of Technology
    A lesson that models the phenomenological approach to enable students to prove the Pythagorean Theorem on their own using puzzle pieces and working together. From the Geometry and Measurement and Algebra and Trigonometry sections of a collection of almost ...more>>

  40. The Pythagorean Theorem and the Maya Long Count - Charles Wm. Johnson; Science in Ancient Artwork -
    Various essays dealing with the possible extension of the Pythagorean Theorem to the third power in relation to the mathematical and geometrical appearance of the Maya long count fractals within progressive series of right triangles. It would appear that ...more>>

  41. Pythagorean Theorem Animated Voice Demo - Chris Beall
    Animted deerivation of the Pythagorean Theorem. ...more>>

  42. Pythagorean Theorem - Bellevue Community College
    A brief illustrated page describing the theorem, with a little historical background and a proof. ...more>>

  43. Pythagorean Theorem - Greg Huberty, Univ. of Georgia
    President James Garfield is credited with a proof of the Pythagorean theorem unlike other proofs in that it does not use squares of the sides; rather, it uses two triangles of sides a, b, and c along with a triangle with legs of c to create a trapezoid. ...more>>

  44. Pythagorean Theorem (Manipula Math) - International Education Software (IES)
    Java applets for experimenting with shifting, rotating, and moving pieces of quadrilaterals to prove the Pythagorean Theorem. ...more>>

  45. The Pythagorean Theorem - Math Forum, Ask Dr. Math FAQ
    What is the Pythagorean theorem? When would you use it? How can we prove it? ...more>>

  46. The Pythagorean Theorem (MSTE) - J. T. Johns; University of Illinois at Urbana-Champaign (UIUC)
    Developing the Chinese proof of the Pythagorean theorem using the Geometer's Sketchpad. Students, each using a computer, are led through it by the worksheet supplied. ...more>>

  47. Pythagorean Theorem - Over 20 Proofs - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
    A general exposition of the Pythagorean theorem, with proofs from Euclid to Garfield - and more. Also links to other sites on the Web with proofs. ...more>>

  48. Pythagorean Theorem Proofs - Math Forum, Ask Dr. Math Common Question
    A selection of answers to questions about proofs of the Pythagorean Theorem, such as "Do you know the exact number of proofs of the Pythagorean Theorem in existence?" and "Why doesn't the Pythagorean theorem work for triangles other than right triangles?" ...more>>

  49. Pythagorean Theorem - Warren F. Davis, Davis Associates, Inc.
    An animated, non-mathematical, annotated proof of the Pythagorean Theorem, assumed to be the method of proof actually used by Pythagoras circa 550 BCE (see the Bronowski reference). ...more>>

  50. Pythagorean Triples - Math Forum, Ask Dr. Math FAQ
    What is a Pythagorean triple? What do Pythagorean triples have to do with Fermat's Last Theorem? ...more>>

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