American Mathematical Society (AMS)
Provides programs and services that promote mathematical
research and its uses, strengthens mathematical education, and
fosters awareness and appreciation of mathematics and its
connections to other disciplines and to everyday life.
Mathematical Association of
American (MAA)
Provides a forum for educators, students, professionals, and
math enthusiasts to share ideas, keep abreast of developments in
the mathematical community, enhance their careers, and make new
friends.
National Council of Teachers of
Mathematics
The public voice of mathematics education, providing vision,
leadership and professional development to support teachers in
ensuring equitable mathematics learning of the highest quality
for all students.
Society for Industrial and
Applied Mathematics (SIAM)
Ensures the strongest interactions between mathematics and other
scientific and technological communities through membership
activities, publication of journals and books, and conferences.
OTHER
arXiv
Open access to 420,900+ e-prints in Physics, Mathematics, Computer
Science and Quantitative Biology (maintained at Cornell University)
Doing Physics with Quaternions
A research effort to see how much of standard physics can be done
using only quaternions, a 4-dimensional division algebra.
Euler Number
Explanations and examples of Euler numbers, also called the secant numbers or zig numbers.
MATLAB Tensor Toolbox Version 2.2 (released Jan. 10,
2007)
Provides the following classes for manipulating dense, sparse, and structured
tensors using MATLAB's object-oriented features: tensor, sptensor,
tenmat, sptenmat, ttensor, and ktensor.
NA Digest
A collection of articles on topics related to
numerical analysis and those who practice it.
Wavelet Digest
This site offers several services intended to foster the exchange of knowledge and viewpoints
related to theory and applications of wavelets.
Wolfram MathWorld
Extensive mathematical resource,
provided as a free service to the world's mathematics and
internet communities as part of a commitment to education
and educational outreach by Wolfram Research, makers of Mathematica
(Latest: April 2008)