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  All Sites - 5504 items found, showing 3951 to 4000

  1. 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>>

  2. 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>>

  3. 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>>

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

  5. 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>>

  6. 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>>

  7. 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>>

  8. 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>>

  9. 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>>

  10. 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>>

  11. 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>>

  12. 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>>

  13. 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>>

  14. 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>>

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

  16. 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>>

  17. 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>>

  18. 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>>

  19. 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>>

  20. 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>>

  21. 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>>

  22. 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>>

  23. 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>>

  24. 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>>

  25. 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>>

  26. 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>>

  27. Peter Doyle - Mathematics, Univ. of California at San Diego
    Advanced tutorials, proofs and papers, mostly statistics, probability, geometry, and graph theory, but with examples from other mathematics areas as well. Don't miss Dr. Doyle's Flip Flops. ...more>>

  28. Peter Gustav Lejeune Dirichlet - Australian Mathematics Trust
    A biography of the mathematician that discusses his theorem, introduction of the function notation y = f(x), boundary problems, minimization principle, and the Pigeonhole Principle. ...more>>

  29. Peter J. Lu - Department of Physics, Harvard University
    Lu's mathematical and historical research has revealed new insights in medieval Islamic quasicrystalline tilings and the earliest machines, such as the one he suggests precisely interconverted the linear and rotational motion responsible for the distinctive ...more>>

  30. peterlu.org - Peter Lu
    Publications and research into medieval Islamic geometry (e.g., decagonal and quasicrystalline tilings in its architecture), soft-matter and colloid physics, high-performance imaging, ancient Chinese technology (e.g., first use of diamond, early precision ...more>>

  31. Peter Olver's Home Page - Peter Olver
    Publications, seminar and conference talks, and more resources from the Head of the University of Minnesota's School of Mathematics. Download notes of Olver's lectures on applied mathematics, numerical analysis, orthogonal bases and the QR algorithm, ...more>>

  32. Peterson's Education Center
    A leading provider of information on U.S.-accredited educational institutions in the U.S. and abroad. Topics include: Summer Programs for Kids and Teens; Public Schools K-12; Private Day and Boarding Schools; Vocational-Technical Schools; Undergraduate ...more>>

  33. Petits Textes sur l'éducation - Laurent Lafforgue
    Essais écrit par le laureat de la medaille Fields 2002, incluent "De l'école et de ce qui fonde la valeur de la culture et du savoir" et "De la culture générale des futurs instituteurs et professeurs" et "Les mathématiques ...more>>

  34. Pfaff's Method (III): Comparison with the WZ Method (Organic Mathematics Proceedings) - George Andrews
    In the 1990's, the WZ method has been the method of choice in resolving new conjectures for hypergeometric identities. The object here is to compare the WZ method with Pfaff's method. Such a comparison should (it is hoped) provide some suggestions for ...more>>

  35. Phalanstère - Équipe de Combinatoire Algébrique, Université de Marne-la-Vallée
    Research into the relations between algebra and combinatorics. Membres; Publications; Logiciels; Séminaire. In French. ...more>>

  36. Phase Portraits for ODE's and Autonomous Systems - Mansfield, Beukers; Mathematics Dept., Penn State University
    A Java applet that allows the user to draw the direction field and integral curves of an ODE. You may also plot a single first order equation by letting x'=1. Or better yet, since dy/dx = y'/x', to solve dy/dx = f(x,y), choose any two functions whose ...more>>

  37. Phase State Diagrams - Harold Brochmann
    Phase diagrams reveal much information about physical phenomena. Brochmann illustrates with a variety of graphs created by computer programs. Phase state diagrams of unstable orbits reveal 'strange attractors', useful in a variety of fields including ...more>>

  38. PhD! ... plus epsilon - Adriana Salerno
    Having earned her math doctorate in 2009, Salerno writes "about some of the challenges I've encountered while teaching, attempting to do research, and the lesser known aspect of 'service'" on institutional committees. In addition to blogging about "publish ...more>>

  39. Philosophy of Mathematics Education Journal - Paul Ernest; School of Education, University of Exeter, UK
    A page with links to past issues of the journal, formerly the Philosophy of Mathematics Education Newsletter, along with links to information on the Falmer Book Series 'Studies in Mathematics Education', the Masters program in mathematics education at ...more>>

  40. Philosophy of Science - David Banach
    A syllabus and collected resources for a course in the philosophy of science, including excerpts from various books. Topics include ancient Greek science and mathematics: the Golden Section, Pythagoras, infinity and continuity, and Plato and Aristotle, ...more>>

  41. Phi's Fascinating Figures - Ron Knott
    More properties of the number Phi, its multiples and powers, continued fractions, formulae, and numerical relations between Phi and its powers. ...more>>

  42. Photographic Polyhedron (Geometry and the Imagination) - Conway, Doyle, Gilman, Thurston; The Geometry Center
    As you stand in one place and look around, up, and down, there is a sphere's worth of directions you can look. One way to record what you see would be to construct a big sphere, with the image painted on the inside surface. To see the world as viewed ...more>>

  43. Photos by Paul Halmos - Mathematical Association of America (MAA)
    Snapshots taken by Paul R. Halmos of notable contemporaries, academics, and other intellectuals of the 20th century. Search or browse the tagged collection of pictures, each of which includes a brief note about the subjects photographed in Halmos' own ...more>>

  44. Phyllotaxis - Pau Atela, Chris Golé; Smith College
    An interactive site for the mathematical study of plant pattern formation. Sections of the site include: Introduction to Phyllotaxis (classification, Fibonacci/golden angle, microscope, mathematical model, and lattices); history; glossary; references; ...more>>

  45. Physics 109N: Galileo and Einstein - Michael Fowler; Dept. of Physics, University of Virginia
    A course that explores two revolutions in our perception of the universe. The first, in which Galileo played the leading role, was the realization that what we see in the heavens - the moon, the planets, the sun and stars - are physical objects. The second ...more>>

  46. Physics and Math Help Online - Bryan Gmyrek
    Tutoring available through e-mail. Previously answered questions are archived on the site, and a tutorial on The Plank Radiation Law - Blackbody Spectrum is available. The author also provides a physics help newsletter and a list of sites for further ...more>>

  47. Physics Forums
    Discussions emphasize physics, but "PF" also includes an entire directory on mathematics: General Math; Calculus & Analysis; Differential Equations; Linear & Abstract Algebra; Topology & Geometry; Set Theory, Logic, Probability, and Statistics; ...more>>

  48. Physics (MathPages) - Kevin Brown
    More than 60 "informal notes" by Kevin Brown on mathematical physics: Doppler for sound and light, optical rays in heterogeneous media, radial orbitgs in Schwarzschild geometry, the formation and growth of black holes, can Schrodinger's cat factor numbers?, ...more>>

  49. The Physics of Baseball - Alan Nathan
    Read about the benefits (or not) of corked bats, the differences between aluminum and wood bats, the issues involved with characterizing the performance of bats from a physics point of view, and a description of the collision between a wooden bat and ...more>>

  50. Physics Problems for the Next Millennium - David Gross, Institute for Theoretical Physics, University of California, Santa Barbara
    The ten most important unsolved problems in fundamental physics, as formulated by participants of the University of Michigan's Strings 2000 Conference: Are all the (measurable) dimensionless parameters that characterize the physical universe calculable ...more>>


 
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