 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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 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  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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 History and Biography  Dave Rusin; The Mathematical Atlas
A short article designed to provide an introduction to history and biography in mathematics. The study of the history of mathematics and its proponents includes several welldeveloped parts. The development of comparatively simple mathematics (through
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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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 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 (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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 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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 Hoagies' Gifted Education Page  Carolyn K.
Research, reviews, professional and social organizations, internet explorations, and other resources for gifted children and their parents and educators. Math items available in all subsections of the site.
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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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 Home Page for Laura Taalman  Laura Taalman
Course materials, mentored projects, publications, and more from Taalman, a professor of mathematics at James Madison University. Taalman's interests range from singular algebraic geometry and knot theory to games, puzzles, and 3D printing. The Puzzles
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 Homepage Michel Delord  Michel Delord
Une site opposé "à la spirale qui prétend faciliter la compréhension en allégeant les savoirs fondamentaux.... [et] à la justification de cette spirale qui sépare l'intelligence conceptuelle de ses manifestations
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 Home Page of Andrei Toom, André Toom  Andrei Toom, Department of Statistics, Federal University of Pernambuco, Recife, Brazil
The home page of one of the developers of the ToomCook, or Toom3 algorithm, a method of multiplying two large integers. Toom's Englishlanguage mathematics articles, published in journals such as the Journal of Statistical Physics, include "NonErgodic
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 Homepage of Keith Matthews  Dept. of Mathematics, Univ. of Queensland, Australia
Matthews is a Senior Lecturer whose professional interests are number theory, teaching, and traversing the World Wide Web to uncover things of interest to number theorists for the Number Theory Web. Links to mathematical interests, gateways (mainly mathematical)
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 Home Page of Persi Diaconis  Persi Diaconis
Download PDF and PostScript papers, organized by coauthor or by year of publication, such as Asymmetric onedimensional constrained Ising model; Random walk on trees and matchings; and Mathematical developments from the analysis of Riffleshuffling.
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 Homepage & Papers  Dr. Peter Singer
Dr. Singer is associated with the MeVisCenter for Diagnostic Systems and Medical Visualization at the Univ. of Bremen, Germany. His interests and publications include: mathematics of finance; Fourier analysis; fractals; medical image processing; stochastic
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 Home Run Numbers  Ivars Peterson (MathTrek)
The integers 61 and 62 have been very much in the news this summer. On the majorleague baseball front, Mark McGwire hit his 62nd home run on Sept. 8, and Sammy Sosa matched that total on Sept. 13, surpassing the record of 61 home runs in a season held
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 Home Schooling: Articles and Research  Carolyn K., Hoagies' Gifted Education Page
Articles and reports on homeschooling, in particular in the context of the education of gifted children.
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 Homeschool Math Contests  Haddon Fox
A list of dozens of math contests open to individuals and which do not require gathering up teams  a requirement that often poses a challenge for homeschoolers. homeschoolmathcontests.com also lists many more regional meets sponsored by colleges and
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 Homotopy Groups  Dave Rusin; The Mathematical Atlas
An introduction to the study of "homotopy continuation methods" in numerical analysis and control, which are essentially unrelated to homotopy theory but rather are more akin to analytic continuation in complex analysis. History, applications and related
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 Homotopy Theory  Dave Rusin; The Mathematical Atlas
A short article designed to provide an introduction to the study of topological spaces using a broader equivalence than homeomorphism, the natural setting for algebraic topology because the traditional algebraic invariants (fundamental group, etc.) are
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 The Honeycomb Conjecture  Ivars Peterson  Science News Online
Mathematician Thomas C. Hales of the University of Michigan at Ann Arbor has formulated a proof of the socalled honeycomb conjecture, which holds that a hexagonal grid represents the best way to divide a surface into regions of equal area with the least
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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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 How Banks Work  HowStuffWorks
An illustrated article describing the functions of banks, what you would have to do to start your own bank, and why we should (or shouldn't) trust them with our hard earned cash.
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 How do I tell a real difference from random variation?  Max Janairo
This paper presents the concepts necessary to understand what the methodologies of hypothesis testing and confidence intervals accomplish, and provides an introduction to the use of these concepts to answer particular questions in medicine. Some problems
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 How do we know about Greek mathematicians?  MacTutor Math History Archives
Linked essay examining how the dates of Diocles given in the MacTutor archive have been determined, and other ways to gain information about the ancient Greek mathematicians, with references and other related web sites.
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 How do we know about Greek mathematics?  MacTutor Math History Archives
Linked essay illustrating the way that Greek mathematical texts have come down to us by looking first at perhaps the most famous example, Euclid's Elements, and Archimedes' palimpsest, with references and other related web sites.
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 How to Compute One Billion Digits of Pi (Organic Mathematics Proceedings)  D. H. Bailey, J. M. Borwein, P. B. Borwein
Ramanujan, Modular Equations, and Approximations to Pi  Bailey, Borwein and Borwein. Abstract: This article follows up one small thread of Ramanujan's work which has found a modern computational context, namely, one of his approaches to approximating
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 How to Compute Planetary Positions  Paul Schlyter
A description of how to compute the positions for the sun and moon and the major planets, as well as for comets and minor planets, from a set of orbital elements. The algorithms have been simplified as much as possible while still keeping a fairly good
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 How to Correctly View a Flatland Painting  Mark Schlatter
A paper with Java illustrations: Given a two dimensional painting of a three dimensional object, you can use geometry to find the ideal viewing locationthe position where the image appears most three dimensional. This site reviews that geometry (using
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 How to Fix an Election  Ivars Peterson (MathTrek)
Voting sounds like a simple matter. Just pick a candidate, then count the ballots and announce the tally. When there are three or more candidates (or choices), however, the results may not actually reflect the true preferences of the voters.
Suppose
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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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 How to Lace Like an Ace (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
One of your sneakers has a broken shoelace. You want to replace it, but the only laces you have around are much shorter. Is there a way to lace your shoes so that you can use the shorter laces? There are three common ways to lace shoes: American (or standard)
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 How to Play Fair With Loaded Dice (Math Chat)  Frank Morgan, MAA Online
Answer to the Challenge: For some reason you need a standard fair die (with the numbers from 1 to 6 on the six faces). All you have is an unfair "loaded" die. How can you use the loaded die to fairly choose random numbers from 1 to 6? ... Roll the die
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 How to sell soap  Keith Devlin (Devlin's Angle)
Humorous takeoff on scriptwriting a series on two families: the Points and the Lines...
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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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 How to Split Your Vote (Math Chat)  Frank Morgan, MAA Online
Answer to the Challenge: Suppose all that any voter in the U.S. cares about is that different parties control the Presidency and the Congress. If there is no communication, how should each voter vote?
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 Humanity's Life Span (Math Chat)  Frank Morgan, MAA Online
Challenge: Estimate the life span of the human race. Answer: Al Zimmermann says with 80% confidence that we have between 100,000 and 10 million years to go.
Perhaps another million years is the best guess. (By comparison, the dinosaurs reigned for over
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 Hungarian Central Statistical Office (HCSO)
Introduction to and history of the Hungarian Central Statistical Office; Hungary in figures; important yearly data and most recent statistics; glossary of statistical definitions; catalog of publications; professional and scientific institutes; and detailed
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 HungHsi Wu's Home Page  HungHsi Wu
Articles on the Common Core Mathematics Standards (CCSS) and math education in general, such as "The impact of Common Core Standards on the mathematics education of teachers," "Bringing the Common Core State Mathematics Standards to Life" (published in
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 Hunting e  Ivars Peterson (MathTrek)
Lagging far behind in the celebrity sweepstakes is the number known as e. Carried to 20 decimal places, e is 2.71828 18284 59045 23536. Only 50,000,817 of its decimal digits have been computed so far  though there are unconfirmed reports that 1 billion
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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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 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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 Ian Stewart
News, books, and research by the science and science fiction writer and Emeritus Professor in the Mathematics Department at Warwick University, where he conducts research in nonlinear dynamics. "Goodies" include all 20 issues of the student mathematical
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