 The Syllogistic Machine  Johan Mårtensson
A JavaScript machine for checking the properties of Aristotelian syllogisms, with links to Mårtensson's OnLine Logic Book.
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 Symbolab  EqsQuest
This semantic search engine for math and science considers the contextual meaning of equations and expressions. Query a mix of text and symbols with Symbolab's pad, which toggles among Greek letters, operators, differentials, and "accents" (vectors, hats,
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 Symbol, Form and Number in Ancient Egypt  Franz Gnaedinger
A book on early mathematics in Egypt, with some social and religious background. Includes a discussion of the use of Pythagorean triples in Egyptian architecture, and hypotheses on the calculation with unit fractions and the approximation of the area
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 Symbolic Computation Group (SCG)  Dept. of Computer Science, University of Waterloo, Ontario, Canada
SCG has as its primary goal the research and development of algorithms for computer algebra, including both symbolic computation and hybrid symbolicnumeric computation. The algorithms developed are incorporated into the Maple computer algebra system.
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 SymbolicNet: Symbolic Mathematical Computation Information Center  ICM; Kent State University
The area of Symbolic and Algebraic Computation (SAC), also known as Computer Algebra (CA), aims to automate mathematical computations of all sorts. SAC research usually combines mathematics with advanced computing techniques. This site includes: introductory
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 SymmeToy  Hank Hufnagel
A Windows program for creating paint patterns, symmetry roses, tessellated art, and symmetrically decorated 3D polyhedron models. The program is easy to learn, fun to use and includes extensive online help. Appropriate for all ages, but especially for
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 Symmetrica  Lehrstuhl Mathematik II, University of Bayreuth
A collection of routines, written in the programming language C, for doing computations in the representation theory of classical and symmetric groups, and related areas. With a list of papers that mention Symmetrica, and a collection of online programs
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 Symmetric Presentations  J. N. Bray
Presentations of groups, symmetric or otherwise, divided into classes to make location easier. Groups that have just one (finite) nonabelian composition factor up to isomorphism are listed in the first seven sections according to the isomorphism type
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 Symmetry and Group Theory (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
Computational and recreational geometry pointers to sites with information, problems, and lessons having to do with symmetry and group theory (tessellations, kaleidoscopes, origami, etc.).
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 Symmetry  Gyorgy Darvas
Organizations, events, publications, projects related to symmetry.
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 Symmetry Studio 1.01  Binkley, Simon; Artware, Inc.
Symmetry software for mathematics and art, for the Macintosh. A computeraided design tool that allows you to quickly create complex twodimensional symmetrical patterns. It simplifies the study and use of mathematical principles that underlie the regular
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 Symposium on Implementing Reform in Math, Engineering, and the Sciences
A workshop that brought together college faculty and administrators involved in largescale implementation projects on the freshmen and sophomore level, or who were preparing such projects for the near future, held June 78, 1996, in Scottsdale, Arizona.
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 SysQuake  Calerga
Highly interactive software for the design and simulation of dynamic systems. Runs on PowerPC Macintosh computers and Windows 95, 98 and NT 4 computers. SysQuake LE is the free version of SysQuake, and may be downloaded from the site.
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 SysteMATHics  Sigurd Andersen
Based on a discipline started by John G. Bennett, systematics is an attempt to understand the meaning implicit in number. The three areas of mathematical exploration covered are triadic numbers; ngrams, number patterns expressed graphically using the
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 System Simulation: The Shortest Route to Applications  Prof. Hossein Arsham; University of Baltimore
Course notes. Information includes: Course Information (for students enrolled in the class); Topics in Descriptive Simulation Modeling; Statistics and Probability for Simulation; SIMSCRIPT, and SPSS Commands; Techniques for Sensitivity Estimation; Goalseeking
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 T^{3} Conferences  Texas Instruments, Inc.
The Tł program hosts the annual Tł International Conference each spring and twoday Regional Conferences throughout the year. Tł Virtual Conferences contain video recorded sessions from Tł events. Tł conferences are appropriate for Kcollege, mathematics
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 Tables of Roman Measurement  Mike Neill
Tables of Roman measurement on this site (Calender, Capacity, Length, Money, Surface, Weight) are taken from A Smaller LatinEnglish Dictionary, by William Smith LLD, a Classical Examiner in the University of London, John Murray, Albemarle Street, 1865.
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 Take a Little Piece of PI with You Wherever You Go  Adam Zampino
Proudly display PI to 1000 decimal places in an attractive design, in various types of apparel and housewares (mugs, clocks, etc.). PI has fascinated people for centuries, and now you can have your own piece of PI to enjoy. This makes a great gift for
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 Taking Games Seriously  Cut the Knot!, Alexander Bogomolny
In the twenty years since it first appeared, Winning Ways for Your Mathematical Plays had become a classic and a rarity. So did its companion book, On Numbers And Games, which was written in just about a week by one of the WW's authors and saw the light
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 Talking about Probability: A Study on Learning Probability Theory via a Dialogue System  Dr. Dietmar Janetzko
After an initial quiz, a "talking head" will present and discuss problems in probability theory. You don't
have to be an expert on probability theory to participate, though people with a background in that field may also enjoy asking questions of Dr.
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 Talk of the Nation, Science Friday  Ira Flatow, National Public Radio
An edited version of a radio program that aired on September 9, 1994. Science Friday host, Ira Flatow, interviewed guests Keith Devlin, Dean of Science at St. Mary's College, and William Dunham, math professor at Muhlenberg College.
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 Talk Stats Forums
A discussion forum for statistics enthusiasts. Get free statistics help or
just hang out and talk about statistics.
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 Tangencies of Circles and of Spheres: Radii Solutions  Eugene F. Dearing; Dearing Aviation
New methods of finding the radii of circles tangent to three given circles, (Apollonius' Problem), and the radii of spheres tangent to four given spheres, (Apollonius' Problem in three dimensions). Download the article in zipped format, or view it online.
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 Tangent Circles  Paul Kunkel
Three circles are given. How many circles can be constructed tangent to all three? How are they constructed? This lesson includes ten applets, to cover all of the special cases. Some of them are very complex.
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 Tangent Planes  Magness, Klotz, Swarthmore College
An experiment in using the World Wide Web to illustrate the intuitive notion of tangent plane to a graph of a function of two variables. Written by Prof. Gene Klotz and Swarthmore College student Ethan Magness.
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 TaniyamaShimura Conjecture Proved (Math Chat)  Frank Morgan, MAA Online
A proof of the full TaniyamaShimura conjecture, partly included in Wiles's 1994 proof of Fermat's Last Theorem, was announced last week [June, 1999] at a conference in Park City, Utah, by Christophe Breuil, Brian Conrad, Fred Diamond, and Richard Taylor,
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 Tanya Khovanova's Home Page  Tanya Khovanova
More than 40 fun predefined properties of numbers, and shows many original and unique properties of an input number. See also this math coach's math blog and lectures.
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 TareasPlus
Videos de lecciones a frente de una pizarra digital, narrado en español. Variando en duración, los asuntos de matemática incluyen aritmética, álgebra, trigonometría, precálculo, cálculo diferencial,
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 The Tau Manifesto  Michael Hartl
"This manifesto is dedicated to one of the most important numbers in mathematics, perhaps the most important: the circle constant relating the circumference of a circle to its linear dimension... The traditional choice of circle constant is π  but,
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 Taxicab Angles and Trigonometry  Thompson, Dray
Taxicab geometry is essentially the study of an ideal city with all roads
running horizontal or vertical. The roads must be used to get from point A to point B; thus, the normal Euclidean distance function in the plane needs to be modified. Article abstract:
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 Taxicab Geometry/La Géométrie des Taxis  Pascal Tesson
A term project for a Pattern Recognition course given by Godfried Toussaint at McGill University. Other student projects from 1997, 1998 and from a Computational Geometry course are also available. Contents: What is Taxicab Geometry? Why Taxicab Geometry?
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 Taylor & Francis Mathematics Journals  Taylor & Francis Group
A list of the mathematics journals published by Taylor & Francis Ltd.
including links to the home page of each journal on the Taylor & Francis Web site. Journals listed: Applied Mathematical Finance; Linear and Multilinear Algebra; Applicable
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 TcP@d: TeleConferencing Pad  Vision Alpha Products
A small, erasable white board together with a PC camera called a TcP@d (Pat. Pend.), used in conjunction with freely available video conferencing software, to transmit "scribal information" in real time. Viewer(s) see equations, drawings, etc., written
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 Teachable Moments International
Nonprofit organization dedicated to inspiring youth to act as "conscious global stewards" through domestic and international academic and cross cultural experiences. Teachable Moments International (TMI) sponsors free math and science workshops for high
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 teachade  AP Ed Ventures
An online community for teachers to discuss issues relevant to teaching, share and author curriculum, access resources that support their professional development, and have an impact on commercial providers of educational services and products. Draft
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 Teacher Education and Professional Development  Mathematics Education at the Math Forum
New ideas and pedagogy: articles, conference sessions, centers, and courses on the Web for preservice education, inservice education, and the college and university level.
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 Teacher Education Online Enlightenment  Online Degree Enlightenment
An online teacher education and continuing education portal. Also links to numerous online degree programs.
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 Teacher Exchange  the Math Forum
Web units, lessons, and activities organized by NCTM Standards and grade band level. Created by Math Forum staff members, educators, and collaborations between the two. Teachers may contribute their own lessons and ideas as well.
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 Teacher.org
Teacher.org's original math lessons all feature Common Core alignment, objectives and outcomes, materials needed, procedure, assessment and evaluation, modification and differentiation, and links to related lessons. Other resources include scholarships
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 Teachers of Teachers of Mathematics (TOTOM)  Western Oregon University
TOTOM is dedicated to providing a forum for people involved in the training of mathematics teachers. Each year during September TOTOM organizes a meeting for the sharing of information on teacher licensure and training. This includes both elementary,
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 TeachersPayTeachers.com  Teacher Synergy Inc.
An online marketplace for teachers to buy and sell original educational materials. Contribute or purchase lesson plans, unit plans, whole courses, lectures, projects, examinations, workbooks, worksheets, original textbooks, syllabi, study guides, teacher
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 Teachers Teaching With Technology (T3)
Professional development training in handheld technology for educators at each level. Sites worldwide in a host of different languages. The United States site includes: professional development institutes, courses, and seminars; resources for educators
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 TeacherTube  TeacherTube, LLC.
Videos of, by, and for teachers. See, in particular, the math channel of this online community for sharing instructional videos. TeacherTube provides teachers, schools, and home learners an educationally focused, safe venue to upload, tag and share videos
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 Teach Further Maths  Paul Hunt
Packages and licenses for hundreds of animated PowerPoint maths lessons, demonstrations, proofs, worked examples, exercises, exam questions, and more. Hunt has also posted math puzzles and opinion polls of the month since November, 2013. Starting with
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 Teaching and Learning (MAA)  Mathematical Association of America
Teaching and learning mathematics is what most MAA members do for most of their lives. This Teaching and Learning section provides useful and thoughtful articles about teaching mathematics. The Research Sampler is dedicated to spreading awareness of current
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 Teaching and Learning Undergraduate Mathematics  The Mathematical Association (UK)
Read Talum newsletters, 1993  2000. Articles include "Learning to Teach"; "The Case for Geometry"; "Intuiting Mathematical Objects Using Diagrams and Kinetigrams"; "Teaching Mathematical Analysis"; and "Using a Theory of Learning in a College Mathematics
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 Teaching Effectiveness Program (TEP)  University of Oregon
Every term, TEP conducts seminars, workshops and presentations on diverse teaching effectiveness issues. From handson, skillbuilding tutorials to nationally acclaimed, outside presenters, TEP regularly provides the campus with new perspectives on teaching.
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 The Teaching Gap  Stigler, Hiebert
A site supporting a book by James W. Stigler and James Hiebert in which they point out that teaching is a cultural activity. "Although there are teachers using extraordinary methods in all cultures, the extraordinary is not what defines most students'
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 Teaching Introductory Statistics in the Social Sciences and Engineering (Mathematics Across the Curriculum)  Dartmouth College
A course that brings together faculty from many different departments who collaborate to produce instructional modules that can be used interchangeably in different introductory courses in statistics, and which integrate the most current technology available
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 Teaching, Learning, and Computing: 1998 Survey  CRITO: Center for Research on Information Technology and Organizations
Research information from the national survey, Teaching, Learning, and Computing1998, a study of teachers' use of computer technology, their pedagogies, and their school context.
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