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  All Sites - 5548 items found, showing 3951 to 4000

  1. Patterns and Magic Squares - Recmath
    This page looks at a particular subset of Magic Squares, those of order four which are 'continuous' (also known as pan-diagonal, Nasik and Jaina). It explores the patterns possible when the numbers in these kinds of squares are represented by a set of ...more>>

  2. Patterns of physical change - Phil Henshaw
    Focuses on the use of tools such as derivative reconstruction (DR) to measure growth and changes in a system. Includes: a short paper "Is the basis of change evolutionary?"; a description of the theory of derivative reconstruction as a method of analyzing ...more>>

  3. Pat Thompson's Home Page - Patrick W. Thompson
    Research on students' development of algebra and calculus ideas in grades 3-16, on the nature of multiplicative reasoning and its role in learning sophisticated mathematical ideas, and on teaching and learning statistical and probabilistic reasoning. ...more>>

  4. Paul Erdos: An Infinity of Problems - Ivars Peterson (MathLand)
    Paul Erdos died of a heart attack on Sept. 20 [1996] at the age of 83. Considered by many as one of the great mathematicians of this century and certainly one of the most prolific ever, he will be missed. For more than 50 years, Erdos wandered the globe ...more>>

  5. Paul's Online Math Notes and Tutorials - Paul Dawkins, Lamar University
    Online notes and tutorials on algebra, calculus, and differential equations. Also, PDFs, some reduced to fit onto one printed page, offering a review of algebra and trigonometry, a primer of complex numbers, listing common math errors, suggesting how ...more>>

  6. Paul's Page of Pi - Paul A. Gusmorino 3rd
    Most of the content of this site is focused on methods of calculating pi: Archimedes' method; Wallis' formula; Gregory, Leibniz, and Machin; Newton's fluxions; and Paul's 8192 digits. Also Pi Poems, Music of Pi, and Pi Links. ...more>>

  7. paulus gerdes's Storefront - Paulus Gerdes
    Purchase print editions or download Gerdes' titles, some also available in Portuguese, Dutch, and French: Drawings from Angola: Living Mathematics, Enjoy Puzzling with biLLies, Puzzle Fun with BiLLies, The Bisos Game: Puzzles and Diversions, Introducing ...more>>

  8. Pavilion of Polyhedreality - George W. Hart
    A page of images of polyhedra from the author of Multidimensional Analysis and the Encyclopedia of Polyhedra. Constructions from wood, paper, paper clips, pencils, food and forks. The is also an extensive linked list of other Web pages related to polyhedra ...more>>

  9. PAX Puzzle - PAX Puzzle
    Wooden puzzles, rope puzzles, puzzles boxes, and board games for sale. Recommendations and gift sets available. ...more>>

  10. Payoff Calculator - www.payoff-calculator.info
    Financial calculators for finding out how long payments will take to pay off a loan, mortgage, or car loan. These payoff calculators also estimate how much you can save by adding extra contributions to your payments. ...more>>

  11. PC Calc
    Calculator program for Windows 2000/XP. Offers calculations, graphing, matrices, steps in solving equations, and more. Features listed and a free 30-day demo is available on the site. ...more>>

  12. PCMI@MathForum - Suzanne Alejandre, Jim King
    An overview and, in some cases, details of the working groups, schedules, and projects from each summer session: Research Program, Graduate Summer School, Undergraduate Program, Mathematics Education Research Program, Undergraduate Faculty Program, High ...more>>

  13. PCS Edventures - PCS Edventures!.com, Inc.
    Education company with a product line ranging from hands-on learning labs in technology-rich subjects like engineering, science, math, robotics, IT, and electronics to administrative tools designed to help schools manage the enormous amounts of data required ...more>>

  14. Pédagogie Mathématiques - Académie de Rennes
    De nombreux documents pédagogiques (du collège au BTS), des jeux ainsi que d'excellents exemples d'utilisation des T.I.C.E. (technologies de l'information et de communication pour l'enseignement) des maths. ...more>>

  15. PDEase2D - Macsyma Inc.
    PDEase solves a range of nonlinear problems in heat transfer, solid mechanics, fluid mechanics, groundwater flow, electromagnetics, chemical reaction diffusion, and quantum mechanics. It simplifies finite element analysis with automatic gridding, automated ...more>>

  16. PDK Poster Project - Pamela Davis Kivelson
    "Using Visual Means to Challenge Stereotypes." Posters for scientific literacy, humanizing the image of research science and scientists, and increasing the number of women and girls who choose to pursue and maintain careers in the physical sciences and ...more>>

  17. Peanut Software for Windows - Rick Parris
    Abstracts and links for downloading free mathematics software: Wingeom (high-precision geometric constructions); Winplot (general-purpose plotting utility); Winstats (scatter plots, curve fitting, histograms, statistical data, and standard theoretical ...more>>

  18. PearlQuiz - Web Pearls Inc.
    A math quiz-authoring system in three parts: an application platform that manages databases and computational engines; a server of HTML and JSP pages; and an author application for writing, editing, and publishing quizzes. Question types include true/false, ...more>>

  19. Pedagogy Articles - Schiller
    Translations of papers by G.W. Leibniz on the catenary (or funicular curve) and by Gauss on the Fundamental Theorem of Algebra. ...more>>

  20. Peek: N-dimensional polytope visualization by cross-section and projection - Gordon Kindlmann
    A program to explore higher dimensional objects interactively through the use of cross-sections and projections. The goal is for the user to gain some intuition about higher-dimensional geometry. Projective views and 3-dimensional cross-sections of hypercubes. ...more>>

  21. Pell's equation - MacTutor Math History Archives
    Linked essay on the indeterminate quadratic equation. With references and other related web sites. ...more>>

  22. Pennies in a Tray - Ivars Peterson (MathLand)
    What's the largest number of pennies that you can pack inside a circular tray to form a carpet of nonoverlapping coins? What about inside a square or triangular tray? What if you could expand or contract the size of all your pennies to fit a required ...more>>

  23. Penn State University Mathematics Department
    Course home pages and instructional material; seminars, colloquia, and conferences; and subject area pages for Penn State research centers, with preprints and links to other resources on the Web: Algebra and Number Theory; Dynamical Systems; Mathematical ...more>>

  24. A Penny Surprise - Ivars Peterson (MathTrek)
    Flipping a coin in the air, catching it, then determining whether it has come up heads or tails is to many people a prototypical random process. In some sense, however, coin tossing isn't really random at all. A mechanical gadget can flip a properly positioned ...more>>

  25. The Penrose Puzzle Room - World of Escher
    Mathematically based Pentaplex Puzzles designed by Sir Roger Penrose, the well-known English mathematician. The original 45 piece Gamebirds, 190 piece Perplexing Poultry - 2 designs, 500 piece Jigsaw Puzzles - 4 designs. ...more>>

  26. Penrose Tiling Generator - Stephen Collins
    A software package for Windows NT, for generating rhombic Penrose tilings and investigating symmetrical topological chains within them. ...more>>

  27. Pens and Crystals (Math Chat) - Frank Morgan, MAA Online
    Answering the challenge: How should you fence in two adjacent rectangular pens of given areas A, B with the least amount of fencing (including the fencing separating them)? Ms. Mattuck's 8th graders at the Richmond School use the Geometer's Sketchpad ...more>>

  28. Pentagonal Geometry and the Golden Ratio (The Geometry Junkyard) - David Eppstein, Theory Group, ICS, UC Irvine
    An extensive annotated list of links to material on geometric problems defined on regular pentagons, involving pentagonal angles, or based on the golden ratio (the ratio of diagonal to side length in a regular pentagon). ...more>>

  29. The Pentagon Universe (Penrose tiles and more) - Kadon Enterprises, Inc.
    Manipulatives based on Penrose tiles, golden triangles and other tilings based on the golden ratio. ...more>>

  30. Pentium Bug Revisited - Ivars Peterson (MathLand)
    The incident that triggered a barrage of ridicule occurred in the fall of 1994, a few months after Intel had introduced its Pentium microprocessor. The furor started with an e-mail message from Thomas R. Nicely, a mathematician at Lynchburg College in ...more>>

  31. Pentomino Relationships - Adrian Smith
    The site describes how pentominoes (twelve pieces of wood, each a different shape and each made of five cubes) fit together into rectangles or cuboids, as well as the subsequent challenge of finding as many other solutions as possible from the one just ...more>>

  32. Perfect, Amicable and Sociable Numbers - David Moews
    Definitions, descriptions, and discussions of perfect, amicable, and sociable numbers; aliquot sequences, related problems, and other definitions of divisibility, with a short bibliography. ...more>>

  33. A Perfect Collaboration - Ivars Peterson (MathLand)
    Euclid and Euler seem an unlikely pairing. One was the most prominent mathematician of antiquity, best known for his treatise on geometry, the Elements. The other was the most prolific mathematician in history, the man whom his 18-century contemporaries ...more>>

  34. Perfection - Greg Lobanov
    This mobile game for iPhone and Android handheld devices presents convex and concave polygonal shapes for players to cut into the outlines indicated. Available directly from the iTunes app store and Google Play. ...more>>

  35. Perfect Numbers - MacTutor Math History Archives
    Linked essay describing the work on perfect numbers from Pythagoras through Euclid, Nicomachus, the Arabs, Cataldi, Descartes, Mersenne, Fermat, Euler, Barlow, Catalan, Cole, and others; with other web sites and 20 references (books/articles). ...more>>

  36. Perfect Symmetry Number Theory - Derek Nalls
    A fundamental, educational exposition of a nonstandard number theory based upon perfect symmetry (in contrast to broken symmetry) modelled throughout arithmetic, algebra, analytic geometry, analytic trigonometry and calculus. ...more>>

  37. Performance Evaluation - Keith Devlin (Devlin's Angle)
    "Dear Professor G,..." A critique of current professorial evaluation schemes in the college/university setting. ...more>>

  38. Perimeter Institute for Theoretical Physics
    An independent, non-profit, scientific research organization working to advance our understanding of physical laws and develop new ideas about the essence of space, time, matter, and information. Located in Waterloo, Ontario, Canada, Perimeter also provides ...more>>

  39. Periodic Points of Quadratic Polynomials - Cut the Knot!, Alexander Bogomolny
    The main purpose of the Mandelbrot set is to index Julia sets corresponding to various values of the parameter c... iterations inside M evolve differently depending on the value of c. (You may explore some iterations via the applet supplied.) An interactive ...more>>

  40. Permadi.com - F. Permadi
    Java and Flash applets: logic games, drawing and pattern-making programs, Conway's Life, and more arcade-style offerings. Also includes tutorials in using Flash and a graphics gallery. ...more>>

  41. The perplexing mathematics of presidential elections - Keith Devlin (Devlin's Angle)
    It's not the idea of one person one vote that's the problem, it's that math that is used to turn those votes into a final decision. Ideally, that math should reflect the wishes of the electorate. But does it? The answer usually comes as a surprise to ...more>>

  42. Personal Algebra Tutor (PAT) - CyberEd, Inc.
    An algebra problem solving program for high school and college algebra. Students can enter a wide variety of algebra problems and PAT will solve them step-by-step, with detailed explanations. PAT solves, simplifies, graphs, etc. Solutions with side-by-side ...more>>

  43. Personalized Programming Service Inc.
    Educational software for teachers and students. Topical software in Math, English, Social Studies, and Science, as well as Quizmaker and Testmaker programs. Download demos and upgrades, browse the products, or order on site. ...more>>

  44. Perspective Study - Hop David
    David suggests a mapping from half of 3-D space onto a plane, feeling that traditional perspective drawings are similar to the image projected by a pinhole camera. Perspective illustrations of arches, looking up or down at a skyscraper, peripheral vision, ...more>>

  45. PEST: Model-Independent Parameter Estimation - Watermark Computing
    PEST is a package that can be used with any pre-existing model for data interpretation or model calibration. Use of nonlinear parameter estimation techniques allows you to exercise greater control. The site includes PEST, Parallel PEST, SENSAN, PEST MODFLOW/MT3D ...more>>

  46. PetaCrunchers - Ivars Peterson - Science News Online
    Setting a course toward ultrafast supercomputing: floating point calculations have become so integral to computers that their performance is often measured in floating point operations per second (FLOPS). The next logical step is petaFLOPS computing, ...more>>

  47. Pete Casazza
    Articles by this University of Missouri professor, some of them scanned from journals, include "A Mathematician's Survival Guide," "Classes of Finite Equal Norm Parseval Frames," "Dear Pythagoras: See What You Started," "Equivalents of the Kadison-Singer ...more>>

  48. Pete L. Clark
    Course notes, open problems, publications and preprints by Clark, who teaches at the University of Georgia, and does research primarily in number theory and arithmetic geometry. See, in particular, Clark's freely downloadable PDF expositions on commutative ...more>>

  49. Peter Ash's Thoughts on Math and Education - Peter Ash
    Musings on doing and teaching mathematics, book reviews, and math problems both elementary and advanced from the creator of Cambridge Math Learning. Blog posts, which date back to August of 2007, include "Very Proper Fractions"; "Physical Models for Non-Euclidean ...more>>

  50. Peter Cameron's Blog - Peter Cameron
    Blog by the University of London professor emeritus. Cameron, whose research focused on combinatorics and group theory, has described his blog as "[helping] me keep my sanity amid the crazy things that sometimes go on in academic life." Posts, which date ...more>>

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