- On-Line Encyclopedia of Integer Sequences - The OEIS Foundation Inc.
Before publishing that new sequence you have just found, you might want to check here to see if it's already been discovered. Directions for how to look up a sequence in the table, abbreviations used, sending in a new sequence; how to look up a reference
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- On-Line Geometric Modeling Notes: Bernstein Polynomials - Ken Joy; Computer Science Dept., UC Davis
Notes about one of the commonly used bases for the space of polynomials, the Bernstein basis, with a discussion its many useful properties. Available on the Web and in PDF format.
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- Online Graphing Calculator: 1-Click Delivers Complete Graph - Barry Cherkas, WebGraphing.com
Online graphing calculator with automatically optimized viewing window plus step-by-step details to help answer any graphing questions. Calculus results include determining derivatives and finding local maxima, minima, points of inflection, and more.
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- Online Gröbner Basis Calculations - Michael McGettrick, National University of Ireland
Enter generating polynomials for the ideal I to calculate its Gröbner basis, minimal Gröbner basis, or reduced Gröbner basis, which can be used for finding the solution to simultaneous polynomial equations and for determining the existence
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- Online journal publication: two views from the electronic trenches - Jonathan Borwein (CECM), Richard Smith (CPROST)
A report on the experiences of two sets of scholarly publications, the Canadian Mathematical Society and the Canadian Journal of Communication, during their adoption and deployment of new electronic media, drawing on the authors' first-hand experience
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- Online lessons: The Newton-Raphson Method - Kostas, Lambros; Aristotle University of Thessaloniki, Greece
An experiment in computer-based training using the Web: an online lesson on the Newton-Raphson 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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- On-Line Logic Book - Johan Mårtensson
An introductory text, with accompanying Java teaching tools for specific topics. Includes an introduction to logic itself and chapters on ontology and semantics.
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- Online Math
One-on-one online tutoring with a former secondary and college math teacher. Skype or e-mail your first math question, answered free; for subsequent problems, negotiate fees, transferrable by PayPal.
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- Online Math Calculator
This collection of free online calculators includes a scientific calculator that accepts inputs of entire matrices and equations, calculates derivatives, and plots functions. One-button unit conversion calculators convert between Celsius and Fahrenheit,
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- Online Math Calculator - Tom Flowers, Mintmark.com
A free Web-based math tool: simple calculator with inverse and exponent functions and the four trig functions.
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- Online Matrix Calculator - Trifon Triantafillidis, Bluebit Software
This is an online matrix calculator, featuring Determinant calculation, LU Decomposition, Matrix Multiplication, Matrix Trace, Cholesky Decomposition, Systems of Linear Equations, Matrix Rank, QR Decomposition, Matrix Inverse Singular Value Decomposition,
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- Online Ordering and Customer Service Center (AMS) - American Mathematical Society
The AMS Bookstore - a searchable catalog of over 2500 books, videos, journals, software and gift items from the AMS and participating publishers; also MathSciNet and TeX Resources; other special orders (featuring the MathDoc Document Delivery Service
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- Online Resources - Georgia Tech School of Math
Syllabi, course notes, problems, and Maple worksheets for single- and multi-variable calculus, linear algebra, statistics, and a Math for Management course (statistics, probability, sets, and some calculus). The site also contains sample exams for calculus
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- Online Scientific Calculator - Alcula; Giorgio Arcidiacono
An advanced scientific calculator that performs calculations on real or
complex numbers.
The results of expressions are displayed as fractions as well as in their
floating point approximations.
An editable expression history allows to update previous
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- Online Spreadsheet Software - PeoriaDesignWeb.com
A simple program to share and edit a spreadsheet online, useful for displaying and editing an Excel-like spreadsheet that multiple users need to edit.
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- Online Statistics: An Interactive Multimedia Course of Study - Rice University, University of Houston, Clear Lake, and University of Houston, Downtown
An introductory-level statistics book. The material is presented both as a standard textbook and as a multimedia presentation. The book features interactive demonstrations and simulations, case studies, and an analysis lab.
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- Onlineunitconversion.com
Oover 225,000 conversions, togethr with explanations of their history and use.
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- ON-Math: Online Journal of School Mathematics - National Council of Teachers of Mathematics (NCTM)
A peer-reviewed journal from NCTM that presented a broad range of ideas for teaching and learning mathematics at any level, from early childhood to young adult. Issues ran from September, 2002 to January, 2009.
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- On Motivation and Understanding - Cut the Knot!, Alexander Bogomolny
Fourth in a series of columns that draw on Frank Morley's fundamental paper On the Metric Geometry of the Plane n-Line - dealing with what amounts to his proof of the Trisector Theorem. Bogomolny outlines Morley's reasoning first and then supplies necessary
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- On the 3x + 1 Problem - Eric Roosendaal
Numerical data and some conjectures on this problem, also known as the Collatz problem or the Syracuse problem. All numbers up to 29,300 * 10^12 (~ 26 * 2^50) have been checked for convergence.
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- On the Area of the Mandelbrot Set (The Geometry Junkyard) - David Eppstein, Theory Group, ICS, UC Irvine
One can upper bound this area by filling the area around the set by disks, or lower bound it by counting pixels; strangely, Stan Isaacs notes, these two methods do not seem to give the same answer. From the newsgroup alt.fractals.
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- On the Bass Note of a Schottky Group [PDF] - Peter G. Doyle
Using a classical method from physics called Rayleigh's cutting method, Doyle proves the conjecture of Phillips and Sarnak that there is a universal lower bound L2 > 0 for the lowest eigenvalue of the quotient manifold of a classical Schottky group,
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- On the Evolution of Islands - Doyle, Mallows, Orlitsky, Shepp
On islands and seas: an island is a maximal set of adjacent marked cells in a ring or row; a sea is a maximal set of adjacent unmarked cells. An inductive proof and a counting-argument proof. A paper that appeared in the Israel Journal of Mathematics.
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- On the Horizon (OTH) - School of Education, University of North Carolina (UNC)
OTH Online: the electronic version of the print publication, with the full text of prior volume years. Also the HORIZON mailing list, seminars and workshops, conferences, and presentations to explore and extend the educational community's thinking about
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- On the Minimax Sphere Eversion - Rob Kusner, Mathematics and GANG, Univ. of Massachussetts at Amherst
A brief paper describing the evolution of the animation of the minimax sphere eversion. Does not include the animation itself.
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- On the Puzzles with polyhedra and numbers - Jorge Rezende
Several articles in PDF format, with related links: one on a set of didactic puzzles published by the Portuguese Mathematical Society (SPM); "Jogos com poliedros e permutações", an article in Portuguese describing puzzles with polyhedra
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- On the Square - Paul Kunkel
Given four arbitrary, unique points, A, B, C, and D, construct one line through each point such that the four lines form a square.
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- On the Teeth of Wheels (Computing Science) - Brian Hayes, American Scientist
A little history on the importance of gears in the history of computing and the importance of computing in the history of gears. "Designers of gear trains have not merely borrowed ideas from mathematics but have also developed some of those ideas on their
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- .oO worksheeps - Felix Heckert
Generate worksheets of customized math exercises, complete with solutions: basic operations with integers, negatives, and fractions; binomial and quadratic formulas; partial roots; percent calculation; curve sketching; metric; derivations; antiderivatives;
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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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- OpenIntro - David Diez and Chris Barr, Co-Founders
The OpenIntro Statistics textbook-- the inaugural effort from these makers of educational products that "are free, transparent, and lower barriers to education" -- comes with data sets for the statistics software package R; normal, t, and chi-square probability
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- OpenMath
A language for communicating mathematical data between computer programs. Its purpose is to enhance different programs capable of handling mathematical data, such as symbolic algebra packages, typesetters, Web browsers, and the like, by providing a basis
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- OpenMathText.org - David A. Santos, Alain Schremmer
OpenMathText.org is a depository of free, downloadable texts and is primarily dedicated to the specification, development, and dissemination of free, editable and downloadable mathematical texts aimed, mainly, at "just plain folk." OMTo invites registrants
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- OpenMath - The OpenMath Society
An extensible standard for representing mathematical objects with their semantics, allowing them to be exchanged between computer programs, stored in databases, or published on the web. Intended for those working with mathematics on computers, for those
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- Open Problem Garden - Matt DeVos and Robert Šámal
A collection of unsolved problems -- mainly, graph theory, combinatorics, and number theory. A wiki for each open problem includes relevant bibliographical citations, importance rating, and recommendation for undergraduates. Navigate by math subject,
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- Open Problems for Undergraduates (DIMACS) - Robert Hochberg, Center for Discrete Mathematics and Theoretical Computer Science, Rutgers Univ.
A collection of open problems in Discrete Mathematics in the areas of Graph Theory; Combinatorial Geometry; Geometry/Number theory; and Venn Diagrams, currently being researched by members of the DIMACS community. These problems are easily stated, require
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- Open Problems in Dynamical Systems - Dept. of Mathematics, State Univ. of New York at Stony Brook
A collection of papers outlining unsolved problems in dynamical systems.
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- Open Problems in Dynamical Systems & Ergodic Theory - Sergiy Kolyada
This collection of problems originated in the Katsiveli-2000 Open Problems Session (Chairman - Benjamin Weiss). New problems are being added. Copies of the page are also at http://iml.univ-mrs.fr:80/~kolyada/opds/ and http://www.math.iupui.edu/~mmisiure/open/.
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- Open Problems - Jeff Erickson
Open problems, mostly in geometry, including folding, combinatorial, and algorithmic problems. Contents include: Existence Problems: Does Object X exist?
Combinatorial Problems: How complex is Object X? Algorithmic Problems: How fast can Problem X be
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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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- OpenStat4 (OS4) - Bill Miller
A statistics package offering descriptive statistics such as central tendency and variability indexes, x-y plots, and frequency distributions; Pearson product-moment correlations and partial correlations; analyses of variance including 1-, 2- and 3-way
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- Operational Research Society
Operational Research (OR) or Operations Research or Management Science (OR/MS) looks at an organisation's operations and uses mathematical or computer models, or other analytical approaches, to find better ways of doing them. The OR Society, with members
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- The Operational Research Society - the Operational Research Society
The Operational Research Society, with members in many countries, provides training, conferences, publications and information to those working in Operational Research. Shop for books, training courses, conferences and one day events; learn about OR (publicity
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- Operations Research - Elmer G. Wiens; Egwald Web Services Ltd.
Operations research - game theory and linear programming: an online linear programming solver; and an online solver of two-person zero sum games (play a two-person zero sum game online).
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- Operations Research - J. E. Beasley
OR-Notes 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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- Operations Research, Mathematical Programming - Dave Rusin; The Mathematical Atlas
A short article designed to provide an introduction to operations research, which may be figuratively described as the study of optimal resource allocation.
Depending on the options and constraints in the setting, this may involve linear programming,
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- Operations Research Society of the Philippines
Activities, officers and members, the ORSP-Corps, and links to related OR sites.
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- Operator Algebra Resources - N. Christopher Phillips
Lists of some resources useful to mathematicians working in the subject of operator algebras. General operator algebra sites and publications, information on regular series of conferences, and some important general mathematical resources.
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