 PseudoDifferential Operators  Mark S. Joshi; Cambridge University, UK
Lecture notes in postscript, PDF, and dvi formats covering a first year graduate course on pseudodifferential operators. The calculus on manifolds is developed and applied to prove propagation of singularities and the Hodge decomposition theorem. Problems
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 P.T. Chang
Articles by this math professor from the University of Alaska Anchorage's MatSu College include "The Ostentatious World of Algebra," "InService Training for the Math Teacher of the 21st Century," and "Retesting in a College Remedial Mathematics Course."
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 PTC: Product Lifecycle Management Software  Parametric Technology Corporation
PTC acquired MathSoft, developer of Mathcad and other software for math, science and engineering for business, research, academic and government markets. They also market Pro/ENGINEER, Windchill, Arbortext, ProductView, CoCreate, and InSight.
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 Publications and Research Tools (AMS)  American Mathematical Society
The AMS research and publishing services include MathSciNet and the AMS Electronic Journals. Research tools for mathematicians include Mathematical Reviews Author Lookup, Institution Codes and Addresses, Serials Abbreviations; the AMS Preprint Server,
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 Publications  Douglas N. Arnold; Institute for Mathematics and its Applications
Most of Arnold's papers written since the late 1980s are available in PostScript, TeX DVI or plaintext file format. The Ph.D. theses of students he has supervised are also online. Primary research interests center around numerical analysis, with an emphasis
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 Publications  J. F. Jardine; Mathematics Dept., Univ. of Western Ontario, Canada
On this page there are: a link to a full list of publications; a book subdirectory (Simplicial Homotopy Theory, by P. G. Goerss and J. F. Jardine); and abstracts of papers: A^1local symmetric spectra; Presheaves of symmetric spectra; A rigidity theorem
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 Public Understanding of Mathematics  Key Issues in Mathematics at the Math Forum
Links to organizations and articles that explore perceptions and assumptions nonmathematicians hold about mathematics and mathematicians.
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 Publishing and Journals  Dept. of Statistics, University of California at Los Angeles (UCLA)
Journals and book series edited by UCLA Statistics faculty, and/or distributed by UCLA Statistical Consulting. Journals: Evaluation Review; Journal of Educational and Behavioral Statistics; Journal of Multivariate Analysis; Journal of Statistical Software.
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 Pulchritudinous Primes
Visualizing the distribution of prime numbers: graphical investigations in 2D, 3D, Prime Island, The Ulam Spiral Phenomenon, Triangle Numbers on the Ulam Spiral. With an introduction, Why Primes?
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 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
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 Putnam Competition  Patrick J. Fitzsimmons
Postscript, Adobe Acrobat, and dvi downloads of problem sets from the William Lowell Putnam Mathematical Competition dating back to 1980. With links to solutions hosted by others, and information on participation.
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 Putnam Exams  Dave Rusin
Solution sets and comments compiled from postings on the sci.math newsgroup. Online resources and citations for exams dating back to 1987.
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 PuzzleBeast  James W. Stephens
A collection of computergenerated 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
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 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.
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 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.
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 Puzzle Page  The Black Stump Ltd.
More than 150 links to puzzle sites on the Web. A new site is added each week.
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 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), indepth explorations of manipulative puzzles (Puzzles
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Puzzles/Oneplayer 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.
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 Puzzles, & Riddles  The Contest Center  Frank Rubin
Hundreds of puzzles and mathematical problems ranging from kindergarten through postdoctoral 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
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 The Puzzle TOAD  Tom Bohman, Oleg Pikhurko, Alan Frieze, and Danny Sleator, School of Computer Science, Carnegie Mellon University
Send the authors your solutions to their challenging graph theory, number theory, geometry, discrete mathematics, logic, and other puzzles. Revisit periodically to see the latest question, and download PDFs of solutions of past problems.
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 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
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 Puzzle University  Amy Galitzer
A nonaccredited "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.
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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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 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 massproduced variety found in stores, but limited production puzzles produced by craftsmen (often
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 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
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 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.
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 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 mindbenders, and more. With links to other puzzles sites and an article on
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 pysimplex  Aaron Watters
Mixed Integer Linear programming modules: pysimplex provides some basic symbolic programming tools for constructing, solving and optimizing systems of linear equations and inequalities. It includes an implementation of the classical SIMPLEX linear optimization
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 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
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 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
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 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.
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 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
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 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.
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 Pythagorean Triples  H.B. Meyer
A Javascript calculator for pythagorean triples. In English and German.
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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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 QAMA  QAMA, LLC
"The calculator that thinks only if you think, too," QAMA requires the operator to first enter a reasonable estimate. QAMA encourages rounding and rapid backoftheenvelope reckoning, but does not tolerate errors of magnitude or sign, or of basic operations
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 QA Quantum Algebra (Front for the Mathematics ArXiv)  Univ. of California, Davis
Quantum Algebra preprints, from the U.C. Davis front end for the xxx.lanl.gov ePrint archive, a major site for mathematics preprints that has incorporated many formerly independent specialist archives. Search by keyword or browse by topic.
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 Qhull  The Geometry Center
Download Qhull, software that computes convex hulls, Delaunay triangulations, halfspace intersections about a point, Voronoi diagrams, furthestsite Delaunay triangulations, and furthestsite Voronoi diagrams. It runs in 2d, 3d, 4d,
and higher dimensions.
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 QMG: mesh generation and related software  Stephen A. Vavasis; Computer Science Dept., Cornell University
The QMG package does finite element mesh generation in two and three dimensions. The package includes geometric modeling software, the mesh generator itself, and a finite element solver. It is free software whose source code is downloadable from the Web.
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 QPuzzle  XIAO Gang
A mathematical jigsaw puzzle: your goal is to recover a disordered photo by finding the inverse affine transformation. A French version is also available.
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 Quadralay's Cryptography Archive  Quadralay Corporation
Encryption standards, frequently asked questions (FAQs), and newsgroups. Clipper, Digital Telephony, History of Cryptology, Internet Security, Kerberos, PGP, RIPEM, and a glossary.
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 Quadrangle  Nikolay Khizhnjak
In Russian: Common properties of quadrangles, a cube and a circle are considered.
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 Quadratic Map  Ron Lee
The Quadratic Map is the chaotic dynamical system composed of the following equation: x_n+1 = 4 lambda x_n(1  x_n) with parameter lambda. The Java applet is a quadratic distribution plotter.
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 The Quadray Papers  Kirby Urner, 4D Solutions
An Introduction to Quadrays. The game of quadrays starts with a regular tetrahedron and four rays pointing from its center to the four corners; these or any ray built from these rays are labelled 4tuples  i.e. four numbers separated by commas and enclosed
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 The Quake Project  The Department of Civil and Environmental Engineering and the School of Computer Science at Carnegie Mellon University; and the University of Southern California's Southern California Earthquake Center (SCEC)
An NSF and DARPAfunded project developing the capability for predicting, by computer simulation, the ground motion of large basins during strong earthquakes, and using this capability to study the seismic response of the Greater Los Angeles Basin. Research
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 QuantFinanceJob.com
The quantitative finance community with tutorials, interview guides, questions and job searching resources for quants to land a successful financial engineering job on Wall Street.
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 QuantFinanceJobs.com
The job board for quantitative finance, financial engineering and risk management.
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 Quantitative Environmental Learning Project (QELP)  Greg Langkamp and Joe Hull, Seattle Central Community College
Supported by the NSF, QELP provides resources to integrate math and environmental science in college classrooms. It features data sets (search by
math or environment topic), a book of classroom exercises, and links to relevant Web sites. Each data set
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 Quantitative Reasoning  Bill Briggs; Dept. of Mathematics, Univ. of Colorado at Denver
Ideas and information about teaching Quantitative Reasoning courses (also called Mathematics for Liberal Arts Students), links to many Internet sites that support QR courses, and some information about a new QR book. Includes an article by William L.
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