丁香园AV

The Math Forum @ Drexel

The Math Forum is a leading center for mathematics and mathematics education on the Internet. Operating under the , their mission is to provide resources, materials, activities, person-to-person interactions, and educational products and services that enrich and support teaching and learning in an increasingly technological world.

Wolfram Alpha

Provides answers and knowledge by doing dynamic computations based on a vast collection of built-in data, algorithms, and methods.

Wolfram Mathworld

MathWorld, an extensive mathematical resource, is 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. MathWorld currently features a number of innovative interactive elements that enhance its usability for a variety of different readers. These features include:

• , which provides a set of pop-up "capsule summaries" for more than 300 mathematical terms
• Extensive citations to books and journal articles, many of which are active hyperlinks
• Thousands of downloadable Mathematica notebooks
• Several types of , including for interactive three-dimensional geometry