 Decisioneering, Inc.
Excelbased decision analysis software tools (Crystal Ball, CB Predictor) for risk analysis and business forecasting.
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 Decision Sciences Institute
An interdisciplinary, international organization dedicated to the advancement of the science and practice of education and research about business decisions. Publishes the Decision Sciences Journal.
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 Decision Tree for Optimization Software  Hans D. Mittelmann, P. Spellucci
Information on optimization software and optimization research, including links to a dictionary, tutorials, testcases, interfaces, and software.
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 Deckulator  Michael B. Moore
For your collectible trading card games, especially Magic: the Gathering. Deckulator calculates the percentage that a card combination will occur in the first cards dealt off the top of the deck. The calculator uses multivariate hypergeometric distribution.
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 Deep in the Jungles  Ivars Peterson (MathTrek)
Humans are predisposed to seeing order and meaning in a world that too often presents random choices and chaotic evidence. Random events sometimes get linked into a meaningful, though ultimately bogus, scenario... At the same time, the mathematics of
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 Defending the Roman Empire  Ivars Peterson (MathTrek)
Questions of military strategy can be handled mathematically. Charles S. ReVelle of Johns Hopkins University in Baltimore and Kenneth E. Rosing, recently retired from Erasmus University Rotterdam, describe their approach in the AugustSeptember American
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 Dekov Software
Educational software, a journal of computergenerated Euclidean geometry, and a computergenerated encyclopedia of Euclidean geometry. Current software titles include: Solving Triangles (stepbystep solutions to triangle problems in elementary geometry);
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 Delaware State Data Center  Delaware Economic Development Office
A focal point for the distribution of census information in Delaware and for the dissemination of other information from the federal government, state government and other sources, coordinating the use of census and other data for economic development.
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 Delphi For Fun  Gary Darby; Intellitech Systems Inc.
Delphi is based on the Pascal programming language developed in the early 1970s by Niklaus Wirth and named after mathematician Blaise Pascal. This site explores the use of programming as a tool in math problem solving, discussing interesting problems,
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 Delta Blocks  Hop David
A way to model different 3D tessellations and a tool for studying geometry, crystallography, and polyhedra. Delta blocks were inspired by M. C. Escher's print "Flatworms," which he said demonstrates that one can build a house not only with the usual
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 Demography: the Java Version  Daniel Udovic, Joshua Coxwell
Java Demography 2.0.2 simulates growth in age structured populations. The program's click and drag features allow users to directly manipulate the fertility and mortality graphs and the population's current age distribution, represented as a bar chart
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 The De Morgan Journal  London Mathematical Society
The De Morgan Journal aims "to encourage academic mathematicians to reflect on current issues in mathematics education at all levels, from primary school to graduate studies; to encourage them to explore links between higher mathematics and elementary
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 Demos with Positive Impact  David R. Hill and Lila F. Roberts
Demos with Positive Impact organizes effective math teaching tools. Submit your own demo, or browse the existing collection of physical demos, calculator demos, databased demos, browserbased demos, and software demos, each with statements of objectives,
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 Demos with Positive Impact  David R. Hill and Lila F. Roberts
A collection of classroom demonstrations that use some form of instructional technology. The authors invite others to submit demos and provide them with feedback on the demos already collected. Demos are organized under the levels of Pre Calculus, Calculus
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 Departamento de Didáctica de la Matemática  Universidad de Granada
The University of Granada's Department of Mathematics Instruction features research groups, each with bibliographies of downloadable publications and other resources, on numerical thinking (pensamiento numérico), statistics education (educación
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 Department of Higher Mathematics, PhysicoTechnical Institute  Moscow State University
In Russian. Information on the department, study materials (textbooks and study aids by the dept. teachers, previous exams, lists of programs and classes and conferences for the current year), and information and download of a mathematical computer program
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 Department of Logic  Faculty of Philosophy, Moscow State University, Russia
In English and Russian. History of the department, staff, books, papers, courses, news.
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 Department of Mathematical Sciences  U.S. Military Academy, West Point
Publications include Cryptologia, CASE (Computer Algebra Systems in Education), Mathematica Militaris, and PRIMUS (Problems, Resource, and Issues in Undergraduate Mathematics Studies). MathTECH is a research project that provides Java applets and TI89
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 Dept. of Statistics  University of Illinois at UrbanaChampaign
Web pages generated by statistics courses; biographical sketches of faculty, staff, lab members, and graduate students; department newsletter. Graduate program admission requirements, degrees offered, courses, statistical consulting services, and The
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 Derek's Daily Math  Derek Orr
"Every Number Has a Story to Tell." This blog by an undergraduate at the University of Pittsburgh details number theoretic properties for every day of the calendar year. Orr, a physics and math major, also maintains a list of "Interesting Propositions/Theorems
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 Derivations of Applied Mathematics  Thaddeus H. Black
An opensource book on the essential ideas underlying the derivations of a large number of mathematical results useful in the modeling of physical systems. PDF, with LaTeX source available under the GNU General Public License.
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 Derivative and Integral  Bill Finzer, Key Curriculum Press
Two sketches demonstrating elementary calculus concepts. Each sketch shows the graph of a function and the graph of its derivative. One sketch lets you change the graph of the function and watch the effect on its derivative. The other sketch lets you
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 Derivative Calculator  David Scherfgen
Compute derivatives of functions online, for free. Supporting symbolic computation of the 1st, 2nd, and subsequent derivatives of multivariable functions, the Derivative Calculator dynamically typesets expressions while you type them. derivativecalculator.net
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 Derivatives Page  Financial Pipeline
Derivatives are financial securities whose value is derived from another "underlying" financial security. Options, futures, swaps, swaptions, and structured notes are all examples of derivative securities. Derivatives can be used in hedging, protecting
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 Derive  Texas Instruments, Inc.
DERIVE software is a Computer Algebra System (CAS) for personal computers (Windows, DOS). In addition, the CAS technology in DERIVE is incorporated in TI89 and TI92 calculators. Derive applies the rules of algebra, trigonometry, calculus, and matrix
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 Descartes' Rule of Signs  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A discussion by Scott Brodie of the basis of the attribution to Descartes of the proposition now known as Descartes' Rule of Signs: The number of positive roots of a polynomial with real coefficients is equal to the number of "changes of sign" in the
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 Description of the Julia sets of the Cauliflower fractal  Frans Faase
Investigation of the Julia sets of the Cauliflower fractal, which is a fractal generated by two linear translations with three parameters. The generated fractal can either be solid, connected, or disconnected. The author shows that two Julia sets consisting
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 Design, Analysis, Implementation, and Evaluation of Graph Drawing Algorithms  Petra Mutzel
Automatic Graph Drawing is a relatively new field in Computer Science. The task is to draw diagrams of objects and their relations in such a way that they are easy to read and understand. Applications are, e.g., animation of algorithms, data and flow
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 Design Resources on the Web  Mathematics Research Center, Univ. of London
Links to webbased resources for design theory and related parts of discrete mathematics and statistics (coding theory, finite geometry, combinatorics, graph theory), with an annotated list of lecture notes and related links.
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 Design Science  Design Science, Inc.
Math publishing and presentation tools for the web: MathType, the professional version of Equation Editor, for Windows or Mac; WebEQ, for building interactive math web pages; MathFlow, math publishing for the enterprise; and MathPlayer, to display MathML
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 Designs, Codes and Cryptography  Kluwer Online
An international, searchable, archived, peerreviewed technical journal publishing survey and original papers on design, codes, and cryptography.
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 Desmos  Desmos Inc
This free online graphing calculator zooms in and out of plots, offers slider bars to explore parameters, switches between Cartesian and polar coordinates, and more. Save sketches, mark points of interest, turn on "projector mode" for thicker, darker
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 Determinación Geométrica de los Números Primos y Perfectos  Omar E. Pol
Un breve ensayo en que "se describe la geometría que determina la distribución exacta de los números primos y también de los números perfectos. Se ilustra el texto con diagramas originales; se muestra el modelo principal
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 developer.com's collection of math Java applets  EarthWeb, Inc.
A browsable, searchable collection of links, authors, notes, and details about Java applets contributed to developer.com. Software is organized into the categories of basics and children's, fractals, games and puzzles, general, geometry, plotting, graphing,
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 Developing A General 2nd Degree Diophantine Equation x^2 + p = 2^n  Thien Do; Westmoore High School, Oklahoma City, OK
Using methods of congruences, the author shows that if p = 3 there is only one positive solution (1,2), and if p is any other odd prime not congruent to 7 mod 8, there are no solutions. Introduction; Methodology; Conclusions; Further Works; Acknowledgements;
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 The Development of Group Theory  MacTutor Math History Archives
Linked essay describing the rise and progress of group theory from the 18th through the 19th centuries, with references (books/articles).
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 De Viribus Quantitatis  The University of Bologna
Luca Pacioli, a Franciscan monk, mathematics tutor, and colleague of Leonardo Da Vinci, wrote this foundational text of modern magic and numerical puzzles between 1496 and 1508. De Viribus Quantitatis (On the Powers of Numbers) contains the first ever
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 Devising channels that nurture ingenuity and creativity in mathematics classes.  Helen Christensen; Loyola College; The Math Forum
Summary of a presentation given at the 1996 Joint Mathematics Meetings in Orlando, Florida. Original projects and individual journals can challenge students who are more linguistically oriented, and who crave expression for their ingenuity and creativity
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 DG Differential Geometry (Front for the Mathematics ArXiv)  Univ. of California, Davis
Differential Geometry 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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 The Diamond Theorem  Steven H. Cullinane
Finite projective geometry explains the surprising symmetry properties of some simple graphic designs  found, for instance, in quilts. Links are provided for applications to sporadic simple groups (via the "Miracle Octad Generator" of R. T. Curtis),
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 Dictionary of Algorithms, Data Structures, and Problems  Paul E. Black
Originally compiled for the CRC Dictionary of Computer Science, Engineering and Technology: a dictionary of algorithms, algorithmic techniques, data structures, and archetypical problems, with related definitions. Algorithms include common functions,
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 Dictionary of Mathematics (EnglishSpanish / SpanishEnglish)  Kenneth Allen Hornak
A comprehensive bilingual dictionary covering everything in mathematics: applied mathematics, pure mathematics, algebra, statistics, geometry, arithmetic, calculus, game theory, topology, probability, trigonometry, economic theory, mathematics teaching
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 Dictionary of Number Words  Intergalactic Power & Light
A dictionary of English language words, phrases, prefixes, suffixes, and
symbols that describe numbers. Cardinal Numbers, Ordinal Numbers, very large numbers, Noninteger Real Numbers, Numeric Ranges.
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 A Dictionary of Units  Cleave Books
A summary of units of measurement worldwide (current units and a few of historical interest); conversion factors to the SI (Systeme International); an outline of the SI; its basic defining standards and some of its derived units; all the SI prefixes
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 DieCast Polyhedra Models  Pedagoguery Software
Sets of small diecast solid aluminum polyhedra, in various colors, available for online purchase.
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 Dien dàn Toán hoc.net
A math site in Vietnamese.
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 Difference and Functional Equations  Dave Rusin; The Mathematical Atlas
A short article designed to provide an introduction to functional equations, those in which a function is sought which is to satisfy certain relations among its values at all points. For example, we may look for functions satisfying f(x*y)=f(x)+f(y) and
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 Differential Equations (calculus@internet  Mathematica)  Christopher A. Barker
Mathematica Track. 1. Basics (Mathematica Overview; The Environment; Arithmetic; Using Variables; Working with Lists; Vectors & Matrices; Algebraic Operations; Functions; Calculus Operations; Graphics). 2. Differential Equations (Creating Slope Fields;
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 Differential equations in industry and commerce  TMR network  ECMI
Coordinated at the Oxford Centre for Industrial and Applied Mathematics, the network aims to enhance understanding of industrial processes and commercial operations through the use of reliable modeling, novel mathematics, and numerical analysis. Six young
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 Differential Equations Maple Worksheets  Rensselaer Polytechnic Institute
Maple worksheets and related PostScript files for teaching elementary differential equations are available for download.
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