 Hedgehog  a Java Mathematical and Geometry API  Hedgehog Software
The Hedgehog Java API is tailored for mathematical and 2D/3D geometric modelling. Written in 100% Java it supports numerous mathematical packages and 2D and 3D geometric objects. Imports/exports are supported in XML, X3D and HSQLDB database formats.
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 helaman ferguson sculpture  Helaman Ferguson
A mathematician sculptor whose stone and bronze artworks include "Aperiodic Penrose," the Coons Siggraph award, "Esker Trefoil Torus," "Fibonacci Fountain," "Fibonacci Tetrahedron," "Figureeight Knot," "Eine Kleine Link Musik," "Torus with CrossCap,"
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 Helena A. Verrill  Department of Mathematics, Louisiana State University
Notes, links, handouts, and other materials from the courses that Verrill teaches, such as Solving Discrete Problems, Calculus, Elliptic Curves, and Modular Forms. She also provides a Java applet for a wallpaper drawing program and stepbystep illustrations
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 Helmer Aslaksen
A mathematics professor at the National University of Singapore. Research involves abstract algebra, including the trigonometry of symmetric spaces, and calculations for the Chinese, Islamic, and Indian calculators. Papers about these topics may be
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 HelpWithAssignment.com  Surya Akella
Online tutoring and homework help for high school, college, university students, and beyond through affiliate site HelpWithThesis.com. Each project receives the attention of a team of two or three individuals rather than one person. See, in particular,
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 Henry Segerman's webpages  Henry Segerman
Mathematical and typographical art "of various kinds and dimensions." See, in particular, Segerman's 3D printed sculpture, book covers and posters, diamond Go, ambigrams, autologlyphs, autological words, Escher's Printgallery, and mathart tshirts available
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 Hermann Grassmann and the Prehistory of Universal Algebra  Desmond FearnleySander
A definition of universal algebra, with a sketch of its prehistory. "...abstract algebras are divided by a very simple scheme into selfcontained `species'. Within each species a perfect duality is found between families of formal laws and the families
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 herp, derp, math nerd
A Tumblr "documentary of my journey, mistakes and all," by a Canadian undergraduate double major at UC Berkeley. Posts, which date back to May, 2012, have included "mr cauchy, teach us your ways," "closed, open, and clopen: yes, it's possible," "real
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 Hessport's Rubik Shop  Hessport's Rubik Shop
Buy Rubik's Cube, Rubik's Revenge (4 x 4 x 4), Rubik's Professor (5 x 5 x 5), Rubik's Magic, Rubik's Rings, Rubik's Shells, Rubik's UFO, Rubik's Mini (2 x 2 x 2), Rubik's Snake, Rubik's Tangle, Rubik's Triamid, Rubik's Double Tangram, Rubik's Bricks,
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 Hewlett Packard/University of Melbourne School Mathematics Competition  Tony Guttmann
Since 1972, a competition emphasizing mathematical insight and creativity. Download PDF files of competitions and solutions dating back to 1996, as organized into the three levels of junior, intermediate, and senior. Also, FAQs, entry form, and other
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 Hexadecimal Headquarters  Intuitor
A comparison of base ten and base sixteen (hexadecimal), discussing why we should switch to hexadecimal. The site includes a hex clock, and explanations of both base ten and hexadecimal.
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 Hex Loop Puzzles  Erich's Puzzle Palace; Erich Friedman
Ten hexagonalgrid puzzles; can you fill in the correct path? Answers provided.
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 HiDigit  Binary Things
Calculating software with extended capabilities, recommended for use by math, physics, and engineering students and teachers. The main advantage of the software is a simple input format even for the most complicated formulas.
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 Hiding in DNA  Ivars Peterson (MathTrek)
Spies might have to start boning up on molecular biology to pass along and decipher secret messages. During World War II, German spies used microdots to hide information in plain view. Consisting of a greatly reduced photograph of a typed page, a microdot
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 Hiding in Lattices  Ivars Peterson  Science News Online
An improved mathematical strategy for encrypting data: the mathematics of lattices offers an alternative basis for a publickey cryptosystem. A lattice is a regular array of points, each one specified by a set of coordinates. Two coordinates would designate
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 Higher Education Resources and Assistance (HEPROC)  Carl Reimann, Moderator; R&R Publishers, Inc.
HEPROC is a community of educators who serve each other as networking partners.
Comprising 2200 members in 40 countries, and over a dozen forums covering specialized subjects, HEPROC can help with research and informational needs. Explore forum topics;
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 High School Financial Planning Program  National Endowment for Financial Education (NEFE)
A sixunit program that provides teens with a greater understanding of and ability to manage their personal finances in the areas of goal setting, budgeting, and saving. With games, simulations, case studies, and interactive exercises, the site provides
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 Hilbert II  Michael Meyling
A predicate calculusbased proof checker, which can check proofs drawn from many different Internet sites.
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 Hilbert's Building Blocks  Robert J. Krawczyk
Investigating space curves to construct 3D forms. Work in 2D with Hilbert curves, spirolaterals, space filling curves, and recursive designs used as a springboard for generating and interpreting space curves.
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 Hilbert Space Methods for Partial Differential Equations  R. E. Showalter
Chapters from a monograph on partial differential equations, in dvi and pdf formats, to download: Elements of Hilbert Space; Distributions and Sobolev Spaces; Boundary Value Problems; First Order Evolution Equations; Implicit Evolution Equations; Second
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 Hilbert's Tenth Problem  Massachusetts Institute of Technology (MIT)
This directory contains files related to Yuri V. Matijasevich's book "Hilbert's Tenth Problem" (MIT Press, 1993), which is the English translation of "Desyataya Problema Gilb'erta" (Nauka, Moscow, 1993). All files in this directory are available via anonymous
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 Hilbert's Tenth Problem  Russian Academy of Sciences
A page to promote research connected with the negative solution of Hilbert's Tenth Problem and developed techniques, which have applications in the theory of algorithms, algebra, number theory, model theory, proof theory and in theoretical computer science.
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 HIME: Huge Integer Math and Encryption Library  DevOTechS
Big number software library (dll) for huge integer mathematics. For encryption and number theory applications. This library also contains encryption functions for public and secret key encryption applications, hash functions, random number generators,
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 HipEstat: Hipertexto de Estadística  Juan y Ignacio Lejarza; Universidad de Valencia, España
A Spanish language tutorial in statistics. Contents include descriptive analysis, probability, inference, and an introduction to multivariate analysis, with text, software, bibliography, and related links.
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 HiQ Analysis, Visualization, and Report Generation  National Instruments
An interactive problemsolving environment where you analyze, visualize, and document realworld science and engineering problems. HiQ solves realworld problems using a notebook methodology that combines interactive analysis, data visualization, and
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 Histogram Applet  R. Webster West, Dept. of Statistics, Univ. of South Carolina
An applet designed to teach students how bin widths (or the number of bins) affect a histogram. The histogram shown for the Old Faithful data set. Students interactively change the bin width by dragging the arrow underneath the bin width scale, and decide
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 Histoire des maths et des mathématiciens  Franck Duffaud
Duffaud, enseignant dans le 93, a dédié son site à l'histoire des maths.
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 HistoriaMathematica  Julio Gonzalez Cabillon
A closed, unmoderated mailing list whose purpose is to provide a virtual forum for scholarly discussion of the history of mathematics among those with a serious interest in the field. English, Portuguese, and Spanish are the official languages, and abstracts
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 Historical Mathematics Monographs  Cornell University Library
More than 550 books in English, French, German, and Italian, scanned from originals held by the Cornell University Library. The Collection is indexed, can be browsed by author and title, and is freely available online to the public.
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 Historical Tidbits  Paul Golba
Biographical and mathematical information (from an online interactive textbook on Real Analysis by Bert G. Wachsmuth) on Niels Abel, Archimedes, Johann Bernoulli, Bernard Bolzano, Georg Cantor, Augustin Cauchy, Augustus De Morgan, Euclid, Leonhard Euler,
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 Historic and International Numeral Systems  Stephanie Nam
Input English, Burmese, Burmese numerals, HinduArabic numerals, Korean, or Thai numerals; select the appropriate choices from the pulldown menus; then press the red "submit" button, and this student project from the Wolfram Summer Camp 2017 outputs
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 The history of cartography
 MacTutor Math History Archives
Linked essay on how map making has played an important role in the development of mathematics.
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 History of Compactness  Manya Raman
Download a paper that discusses the development of the concept of compactness, one of the most important and useful notions in advanced mathematics and a sort of gatekeeper topic to higherlevel mathematics. By presenting an historical treatment of this
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 The History Of Computing  Dept. of Computer Science, Virginia Tech
Index of the items in a collection of math history materials related to the history of computing by J. A. N. Lee, EditorinChief of the IEEE Annals of the History of Computing, constructed as part of the course materials for the "Professionalism in Computing"
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 A History of Mathematical Notations  Florian Cajori
"In this history it has been an aim to give not only the first appearance of a symbol and its origin, but also to indicate the competition encountered and the spread of the symbol among writers in different countries...." The first volume of Cajori's
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 The History of Mathematics
Notes from a History of Mathematics course given at the Univ. of South Australia and a Graduate Certificate in Mathematics Education project. Topics include a chronological study of the development of number from a European and Eastern perspective; the
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 History of Mathematics  Carl Eberhart; Dept. of Mathematics, Univ. of Kentucky, Lexington, KY
Information and Maple worksheets on Egyptian fractions and geometry, Babylonian numeration, Hippias and his Quadratix, cubic equations, trigonometry until Ptolemy, curves, and more. Also examples of student projects. A spring 1999 course on the history
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 History of Mathematics  David Joyce; Dept. of Mathematics & Computer Science, Clark University
History sources, books and articles online. Sources by region (Babylonia, Egypt, China, Greece, India, Arab sphere, Japan, and Europe); Books and other nonweb resources (organizations, bibliography of source books, journals, bibliographies and catalogues,
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 History of Mathematics  David R. Wilkins, Trinity College, Dublin
A directory of Web sites and pages around the world relating to the history of mathematics. Also biographies of some seventeenth and eighteenth century mathematicians, taken from A short account of the history of mathematics (4th edition, 1908) by W.
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 History of Mathematics (Mathematics Archives)  University of Tennessee, Knoxville (UTK)
An alphabetical list of some of the best sites for math history on the Web, part of the Math Archives' collections of Math Topics. Icons provide more information about level, interactivity of site, Java, and presence of images or links.
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 History of Mathematics (MathPages)  Kevin Brown
About 40 "informal notes" by Kevin Brown on math history: Zeno and the paradox of motion, Archimedes and the square root of 3, Mayan numeration, Hipparchus on compound statements, Planck's analysis of Kaufmann's experiment, the ten means of Ancient Greece,
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 History of Science and Math
A "free, communitydriven Q&A" for those interested in the history and origins of science and mathematics. Post, answer, and vote up or down questions such as "Ancient Chinese numbering system," "What evidence is there that Fermat had a proof for
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 History of Science, Technology, and Medicine  WWW Virtual Library (WWWVL)
A searchable online service established to keep track of information facilities in the history of science, technology and medicine. Sites are available alphabetically or by scientific field, source, exhibitions, institutions, regions, a historical biographical
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 A history of the Burnside problem  MacTutor Math History Archives
Linked essay on the development of the questions: Is a finitely generated periodic group necessarily finite? Is a finitely generated periodic group of bounded exponent necessarily finite?
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 A history of time: 20th century time
 MacTutor Math History Archives
Linked essay on the dramatic changes in ideas about time in the 20th century.
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 A history of time: Classical time
 MacTutor Math History Archives
Linked essay on the central role time has played in mathematics from its very beginnings.
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 The history of voting
 MacTutor Math History Archives
Linked essay on the history of electoral systems.
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 A history of Zero  MacTutor Math History Archives
Linked essay on the development of the concept of zero. There are two important but different uses of zero: one as a empty place indicator in our placevalue number system, and one as a number itself in the form we use it as 0. There are also different
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 HO History and Overview (Front for the Mathematics ArXiv)  Univ. of California, Davis
Math History and Overview 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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 Holistic Numerical Methods Institute  Autar Kaw
Open courseware, books, primers, journal abstracts, PowerPoint presentations, multiple choice tests, and other resources supporting a typical course in Numerical Methods for undergraduates majoring in science, technology, engineering and mathematics (STEM).
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