 Nearest Neighbors and Voronoi Diagrams (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material on Delaunay triangulations and Voronoi Diagrams.
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 NEOS Guide (NetworkEnabled Optimization System)  The Optimization Technology Center
A thumbnail sketch, outlines of the major algorithms, and pointers to software packages on optimization and its various subdisciplines: integer programming, stochastic programming, network programming, bound constrained, nonlinearly constrained, linear
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 New Foundations  Randall Holmes
Developing site for the set theory "New Foundations," first introduced by W.V.O. Quine in 1937. A refinement of Russell's theory of types based on the observation that the types in Russell's theory look the same, as far as one can apparently prove. Site
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 New Standards  Beauregard Parish (Louisiana) Public Library
Links to sites with information about and discussions of standards, both countrywide and particular to Louisiana.
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 The NODE Learning Technologies Network  The NODE Learning Technologies Network
theNode.org provides networked support for instructors, trainers, designers and administrators with a professional interest in teaching with technology. Register for membership online. Internet resources for the study and teaching of mathematics include
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 Nonius  Jaime Carvalho e Silva
Nonius  Projecto Computação no Ensino da Matemática  Arquivo Electrónico de Matemática. History of mathematics; mathematics topics, mathematics teaching, technology in teaching, and links to relevant mathematical
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 Nonlinear Dynamics (Mathematics Archives)  University of Tennessee, Knoxville (UTK)
Links to sites on nonlinear dynamics, chaos and turbulence studies, complex systems and visualization, continued fractions and chaos, dynamical systems and technology, dynamics and stability of systems, with indications of level and type of resource offered.
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 North Carolina School of Science and Mathematics (NCSSM) AP Calculus Web Center  John Goebel, Matt Wagers
Available here are postings related to the high school AP calculus program, including a Lesson Center which contains MathcadŽ versions of class lectures (MathcadŽ 6.0 or later required); Study Aids which provide material useful for AP Calculus exam preparation,
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 Notes and Literature on Prime Numbers  Peter Alfeld, University of Utah
From Understanding Mathematics, a study guide for Univ. of Utah students. Includes definitions, explanations, links to other related sites, and a list of works to consult for further reference.
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 Numbers (Mathematics Archives)  University of Tennessee, Knoxville (UTK)
Links to sites about particular numbers; dates; palindromes; Gaussian integers; Carmichael numbers; continued fractions; e; Egyptian fractions, mathematics, and numerals; constants; Fermat; Fibonacci numbers; pi; large numbers, sequences, prime numbers,
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 Number Theory Centres  Keith Matthews, Dept of Math, University of Queensland, Brisbane, Australia
An alphabetical list of links to international number theory groups and research centres.
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 Number Theory  Dave Rusin; The Mathematical Atlas
A historical introduction to number theory; applications and related fields and subfields; textbooks, reference works, and tutorials; software and tables; other web sites with this focus; and selected topics.
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 Number Theory (Mathematics Archives)  University of Tennessee, Knoxville (UTK)
An extensive list of links to sites with information about number theory, classified by level and type of resource.
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 Numerical Analysis  Math Forum
Links to some of the best Internet resources for numerical analysis: Web sites, software, Internet projects, publications, and public forums for discussion.
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 Numerical Methods  Douglas N. Arnold; Mathematics Dept., Penn State University
An extensive list of centers (including online services and search engines), individual libraries, other sites (general and specific), journals, books, online publications, and other resources for numerical methods.
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 Oldani's Math and Music Website  Norbert Oldani
A description of the types of mathematics used for electronic music. The site includes other website links and a bibliography.
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 Oldies & Goodies: The School Museum List and Site  From Now On
Virtual Museum Resources, sponsored by From Now On  The Educational Technology Journal. Museum Resources: articles and other resources meant to guide those who are building virtual museums with their students; The Grand List of School Virtual Museums:
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 Olimpíadas Portuguesas de Matemática  Soc. Portuguesa de Matemática (SPM)
The Portuguese mathematical Olympiads: history; archive of problems; past winners; rules; the Portuguese team; links to relevant Web sites; and more.
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 Online Exhibits Hotlist  The Franklin Institute
A list of links to more than 100 online learning experiences for math and science, both interactive projects and exhibits.
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 Online Innovation Institute (OII)  Ferdi Serim
The OII provides educators with a learning environment to support integrating the Internet into their individual teaching styles, offering a combination of online and onsite collaborations in which participants develop projects to use in their classrooms.
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 Online lessons: The NewtonRaphson Method  Kostas, Lambros; Aristotle University of Thessaloniki, Greece
An experiment in computerbased training using the Web: an online lesson on the NewtonRaphson method for solving nonlinear equations and systems of equations. The lesson includes text, sound clips, animation, and links to related computer programs. Contents:
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 Open Directory  Science: Math  Netscape
A comprehensive directory of math sites on the Web, listing links of mathematical interest by general topics, math topic, and site name.
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 Open Directory  Science:Math:Statistics  Netscape
A comprehensive directory of statistics sites on the Web, listing links of statistical interest by general topics, statistics topic, and site name.
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 Open Problems (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material on open problems in geometry: antipodes; bounded degree triangulation; centers of maximum matchings; chromatic number of the plane; combinatorial complexity of spheres; covering points by rectangles; cube
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 Open Source Mathematics  David Joyner
An index of open source math software, texts, and papers.
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 Operations Research  J. E. Beasley
ORNotes are a series of introductory notes on topics that fall under the broad heading of the field of operations research (OR). Beasley includes practice questions ("tutorials"), links to other web resources, and past exams.
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 Optics2001
Online optical library with links to papers, theses, and articles on optics for beginner level to researchers. Contents include: General Optics; Optical Detectors; Optical Fibers; Image Processing; Design Techniques; Optical Elements; Optical Instruments;
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 OpticsNotes.com  NIXAR
An index of optics and photonics tutorials, references, and resources. Fundamentals, Design, Components, Manufacture, Applications, References, Industry. Books, software, dictionary, formulas, industry directories, journals, materials, newsgroups, patents,
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 Optimization Links  Tom Cavalier; Industrial and Manufacturing Engineering, Penn State Univ.
Links to online information on various aspects of optimization; interactive guides/case studies; optimization software/test problems; and other sites. Also general operations research sites; OR/Optimization people. Location/Routing/ Conference Information;
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 Origami (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material on the Japanese art of paper folding, obviously geometrical in nature. Some origami masters have looked at constructing geometric figures such as regular polyhedra from paper. In the other
direction, some
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 paperfolding.com  Eric Andersen
Learn to fold origami from diagrams; read about the history of paperfolding, including the origin of the term "origami." The origami & math essay contains sections such as Origami, Geometry, and the Kawasaki Theorem; and Origami and Topology.
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 Parcelles d'infiniPromenade au jardin d'Escher  Alain Nicolas
Book in French, largely composed of pictures, on methods of figurative tiling. Site includes links to related sites in French and English.
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 Parent's Page  Chicago System Initiative (CSI)
A list of informative sites for parents who have questions about parenting and how to get involved in their children's education. Topics include Family Math (a page on math education); Helping your child learn math; Math and Your Child (information on
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 Pathways to School Improvement  North Central Regional Educational Laboratory (NCREL)
A Web site that addresses school improvement issues about students, educators, content, methods, and the environment. Practical, actionoriented summaries of best practice and research, descriptions of schools that have successfully addressed issues,
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 Pat's Math & Problem Solving Links  Pat McQuatty
Site recommendations from the math consultant for the Western Quebec School Board. See, in particular, Special Days (Hundredth Day of school, Math with the number 2000  twenty suggested math activities for the year 2000). Also mathrelated links for
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 Patterns  Suzanne Alejandre
Links to Web sites with patterns. Students look through the pages and answer these questions: How do natural patterns influence us? How do patterns help us to solve problems? Can you put elements of a pattern into an order that can be measured? that
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 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
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 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.
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 Pearson Learning  Dale Seymour Publications
A leading publisher of educational materials, emphasizing math, science, and the arts. The site contains: an online catalog; math curricula include: CMP (the Connected Mathematics Project) and Investigations (Investigations in Number, Data, and Space,
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 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
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 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).
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 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 K12; Private Day and Boarding Schools; VocationalTechnical Schools; Undergraduate
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 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
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 Pi Day  Math Forum, Teacher2Teacher FAQ
Answers to a frequently asked question: What activities can I use for Pi Day?
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 The PiFactory  David Whitfield
Revision notes, boardshots, and Excel worksheets to download, from when the author used to teach in North London. The PiFactory includes an opensource assessment suite, classroom resources, and concept maps. The PiFactory conveniently pulls together
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 PJ's Mathematical Gold Nuggets  Pam Strout; Bethel High School, Bethel, Connecticut
Links relating to K12 research topics in mathematics and mathematics teaching collected and usefully annotated by a mathematics teacher.
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 Place Value  Math Forum, Teacher2Teacher FAQ
Answers to a frequently asked question: How do I provide my students with practice on their place value skills?
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 Planar Geometry (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material on planar geometry.
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 Planetqhe (Probabilistic Learning Activities Network)  David Kay Harris
Outoftheordinary probability problems. The site focuses on using methods of probability to solve counterintuitive problems and deepen students' understanding and competence in the domain. Sections include: a brief history and rationale of the site;
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 Plus Magazine  Department of Applied Mathematics and Theoretical Physics, University of Cambridge
Plus (formerly PASSMaths) is a triannual online magazine for older pupils and the general public. It publishes articles explaining the diverse applications of mathematics used in solving problems in physics, chemistry, biology, engineering, and economics.
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