 Homogeneous Transformation Matrices  Daniel W. VanArsdale
Explicit ndimensional homogeneous matrices for projection, dilation, reflection, shear, strain, rotation and other familiar transformations.
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 Hopfield Net for 8Queens Problem  Yuri Pryadkin
Given a standard chessboard and 8 chess queens, place them on the board so that no queen is on the line of attack of any other queen. The author's applet finds solutions to the general problem, with N queens on the NxN board. Tips and analysis of the
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 Hopf Topology Archive  Clarence Wilkerson, Dept. of Mathematics, Purdue University
The Hopf archive contains freely available articles and preprints as dvi, ps, text, or lj.gz files. Some short abstracts and a search engine are included, as well as pictures of topologists and some useful links concerning topology.
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 HostMath  Cui Wei
Input LaTeX, Tex, AMSmath or ASCIIMath, and this dynamic equation editor renders the notation for typesetting. HostMath formats for math, logic, symbols, Greek letters, trigonometry, arrows, and more.
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 The Houston Journal of Mathematics  Klaus Kaiser, Managing Editor, University of Houston
A quarterly refereed journal publishing original research papers on mathematical topics. It welcomes contributed papers that develop interesting, or important, new mathematical ideas and results or solve outstanding problems. Read titles and abstracts
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 How Many? A Dictionary of Units of Measurement  Russ Rowlett; University of North Carolina at Chapel Hill
A dictionary of both metric (SI) and English measurement units, with history, links to related sites, and a bibliography.
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 How To Get Into the Newspapers  Keith Devlin (Devlin's Angle)
A lecture to Devlin's readers with good advice on how to write math clearly enough and other important things to do to get an article published in the newspapers.
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 Howto Series  ERIC/AE; Bruce Thompson, Texas A&M Univ.
This is a set of online, fulltext books and booklets addressing practical evaluation, research, measurement, and statistical issues. The series started as a joint project of ERIC/AE and Bruce Thompson, Texas A&M University. We have since added other
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 HPCNetlib: High Performance Math Software  National HPCC Software Exchange (NHSE)
The high performance branch of the Netlib mathematical software repository. HPCNetlib provides information about high performance mathematical software, both research and commercial, as well as a roadmap to software selection and performance issues.
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 HTML with LaTeX  Alan Selby
Given HTML input that includes LaTeX encoded equations, the LaTeX2HotEqn applet generates webpages with typeset quality mathematics. With examples and documentation.
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 HULL  A program for convex hulls  Ken Clarkson
Hull is an ANSI C program that computes the convex hull of a point set in general (but small) dimension. The input is a list of points, and the output is a list of facets of the convex hull of the points, each facet presented as a list of its vertices.
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 HumanComputer Interaction Group (HCI)  University of York (UK)
A group founded in 1984 to pursue research into the design and evaluation of interactive systems. Its interdisciplinary approach integrates rigorous formal methods from the latest software engineering research with theories of perception, learning, and
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 Hypatia  Taylor, Dawson; Dept, of Computer Science, Queen Mary & Westfield College, East End, London, UK
Hypatia is a searchable directory of research workers in Computer Science and Pure Mathematics, and a library of their papers. Contents: New papers, people, places and papers, bibliographies, useful links, Hypatia of Alexandria. Authors can be found by
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 Hyperbolic Geometry (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material in hyperbolic geometry, in which infinitely many parallels to a line can go through the same point.
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 Hyperbolic Geometry Using Cabri  Tim Lister
A site that provides documentation for drawing in the hyperbolic plane (noneuclidean geometry) using Cabri. As examples, it explains several concepts of hyperbolic geometry providing visualizations in the form of figures, animated gifs, and downloadable
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 Hyperbolic Tessellations  David Joyce; Dept. of Mathematics & Computer Science, Clark University
The hyperbolic plane has more space in it then the Euclidean plane. There are only three regular tessellations of the Euclidean plane, namely {3,6} in which equilateral triangles meet six at each vertex, {4,4} in which squares meet four at each vertex,
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 Hyperspace at UBC  University of British Columbia, Vancouver, Canada
Hypertextbased services for general relativity research from the University of British Columbia's general relativity and cosmology group. Information on the UBC GR group; Software for finding GR mail addresses; GR News Archives; Preprint searches; Classical
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 Hyperspace  International Society on General Relativity and Gravitation, QMW, University of London
A set of hypertextbased services for general relativity research from the QMW Relativity group (Queen Mary and Westfield College, Univ. of London). Software for finding GR (e)mail addresses; GR News Archive; Our GR related FTP archives; Preprint searches
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 Hypertext Help with LaTeX  Sheldon Green
LaTeX is a document preparation (wordprocessing) system widely used in the scientific community that processes an input file containing the text of a document with interspersed commands that describe how the text should be formatted. The crosslinked
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 IASolver: The Brandeis Interval Arithmetic Constraint Solver  Timothy J. Hickey
A Java applet that uses interval arithmetic techniques to solve systems of nonlinear constraints. It includes a 'safe plotting' feature for plotting projections of the constraint set onto any two variables. The source code is also available.
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 IBM ILOG CPLEX  International Business Machines Corp.
This mathematical optimization software features dynamic algorithm parameter control and postsolution information and analysis such as objective function value, solution variable and slack values, constraint dual values (shadow prices), bound sensitivity
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 iDeSolver  KeatsSoft Co.
iDeSolver is an integrated environment that simplifies the process of
solving ordinary and partial differential equations (ODE, PDE), linear and
nonlinear algebraic equations, with computational data and plot output
through MATLAB. The site offers
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 Ido Efrat
A mathematics professor at Ben Gurion University of the Negev in Israel. Site includes the syllabi for current courses and a list of Efrat's publications in abstract algebra, especially group theory. Some articles may be downloaded in PDF or DVI format.
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 IEOR Tools
Purchase books and software on operations research, industrial engineering, data mining, analytics, and statistics.
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 IFS (Iterated Function Systems) for 2D and 3D Visualization  Craig M. Wittenbrink
Using fractal interpolation to graphically represent two and threedimensional scalar data: download article in PDF or PostScript format, and view related images.
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 IIE (Institute of Industrial Engineers)
A society dedicated to serving the professional needs of industrial engineers and all individuals involved with improving quality and productivity.
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 ILNumerics  Jonas Nordholt
This numerical library for .NET supports the creation of algorithms and visualizations for scientific computing and technical applications. Available in free, open source Community Edition as well as Professional Edition, which offers prebuilt binariesc
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 Image Coding Using Fractals  Signal and Image Processing Group, University of Bath
Graphs show how image compression using fractals compares to other methods. Also includes comparison pictures and a list of articles on fractal compression, some of which may be downloaded in gzipped PostScript format.
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 Image Coding Using Wavelets  Signal and Image Processing Group, University of Bath
Read the article "What makes a good orthonormal wavelet for image compression?" Download other wavelet articles in PDF or PostScript format. Visit the Wavelet Warehouse, a repository of wavelet filters (biorthogonal and orthonormal) to download and
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 Images and Mathematics (Mathematics Archives)  University of Tennessee, Knoxville (UTK)
A large collection of images based on or related to mathematical principles, many purely mathematical abstractions, such as fractals; others of natural objects whose shape is explained by equations and mathematical models (for example, a drum vibrating).
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 IMAGINARY  Mathematisches Forschungsinstitut Oberwolfach
A platform for open and interactive mathematics. Explore events, exhibitions, programs, galleries, handson, and films  and share your own activities, projects, and discussions. Started as a maths and arts exhibition for the German Year of Mathematics
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 Implementations of Extended LLL  Wilberd van der Kallen
Notes, including implementations of the extended LLL in Mathematica and GP/PARI, and links to home pages of mathematicians doing recent relevant work.
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 The Independent Set Algorithm  Ashay Dharwadker
A polynomialtime algorithm for finding maximal independent sets in a graph with new bounds on Ramsey numbers.
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 Index Nationale des Prépublications des Mathématiques en France
Projet qui vise à constituer un index interrogeable par champs: (auteur, titre, classification...) de toutes les prépublications et thèses de mathèmatiques en France. A searchable index by field (author, title, category) of
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 Index Using Mathematics Subject Classification (MSC)  Dave Rusin; The Mathematical Atlas
The index pages at this site are organized according to the Mathematics Subject Classification (MSC) scheme. (This is the scheme developed by the American Mathematical Society and Zentralblatt für Mathematik.) General headings include Foundations;
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 Indian Society for Mathematical Modelling and Computer Simulation (ISMMACS)
Information about the society, its constitution and bylaws, membership application form, conferences.
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 Indian Statistical Institute (ISI)  Bangalore Centre, India
An institute of higher learning in Mathematics and Statistics.
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 Infinity  Pavel Mikhailov
Infinity solves systems of ordinary nonlinear nonautonomous differential equation. See screenshots, read articles, and subscribe to the newsletter; download or purchase the software; obtain help and technical support online.
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 InfoMac archive  Washington University
A mirror of the FTP InfoMac Archive of the University of Michigan. The sci folder offers many mathematics .hqx program files to download, including a subfolder for calculator freeware.
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 INFOMAC HyperArchive ROOT
Root of a hypertext subtree containing a mirror of the Sumex InfoMac archives for the Macintosh. The _Science_&_Math folder offers many mathematics program files to download. Designed for browsing, allowing fast access to the brief descriptions at the
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 Information Mechanics Group  Massachusetts Institute of Technology
A research group for the physics of computation. Resources for CAM8, a computer and operating system designed for work with cellular automata, and various papers, which are available for download in PostScript format .
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 INFORMS Computing Society (ICS)  Institute for Operations Research and the Management Sciences
A society concerned with computer science, artificial intelligence, and their relation to operations research and the management sciences. The purpose of the ICS is twofold: to help keep INFORMS members abreast of useful developments in CS/AI, and to
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 INFORMS Online: Institute for Operations Research and the Management Sciences
The online information service of the Institute for Operations Research and the Management Sciences, serving the professional and scientific needs of OR/MS investigators, scientists, educators, students, and managers, and their institutions. You can subscribe
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 Innovation in Education  M. Casco Associates
Educational software and free online courses in classical mechanics and chaos theory, free (demo version) downloads of mathematical modeling laboratories, and tutoring by email in physics and math. Math modeling programs include classical mechanics and
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 INSERMCEA Cognitive Neuroimaging Unit
This lab of Paris' Institut national de la santé et de la recherche médicale (INSERM) investigates highlevel human cognitive functions using experimental psychology, neuropsychology and neuroimaging approaches. See, in particular, the unit's
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 Institute for Advanced Study/Park City Mathematics Institute (PCMI)
PCMI integrates mathematics education with mathematics research at the highest level, fostering interaction among its participants. It offers a threeweek Summer Session, a yearround High School Teacher Program, a Mentoring Program for Women in Mathematics,
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 Institute for Computer Applications in Science and Engineering (ICASE)  NASA Langley Research Center
A center of research in applied mathematics, numerical analysis, fluid dynamics, and computer science, operated by the Universities Space Research Association (USRA) to provide a natural mechanism for interactions among NASA scientists and engineers,
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 Institute for Gravitational Physics and Geometry  Dept. of Physics, Penn State University
The Institute fosters research of an interdisciplinary character linking astrophysics, gravitational wave physics and experimental gravitational wave detection in the pursuit of the scientific understanding of gravity and the development of gravitational
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 Institute for High Performance Computing Applications (IHPCA)  L. Long, Director; Penn State University
A research center whose mission is to develop and implement new techniques for the numerical simulation of scientific and engineering problems that require the use of large scale computations, with particular emphasis on parallel computers and distributed
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 Institute for Logic (Institut für Formale Logik)  University of Vienna, Vienna, Austria
Research in the group is concentrated on axiomatic set theory, in particular: Inner models and large cardinals; Constructible models of set theory / core models; Consistency strengths; Coding; Forcing; and Descriptive set theory. Abstract Server; People
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