The prime spiral, also known as Ulam's spiral, is a plot in which the positive integers are arranged in a (left figure), with indicated in some way along the spiral. In the right plot above, primes are indicated in red and composites are indicate...
Logic Problems - grouped by difficulty. Includes answers and hints.
In this post I'll explain and demonstrate an algorithm that simulates a group of entities grouping together, illustrating something called "flocking". I think it's quite neat because the flock exhibits some complex collective intelligence when just a...
Step-by-step directions to build and share a simple subitizing (rapid counting) game with Mathematica and Wolfram CDF Player. Download provided.
This is a foundational textbook on abstract algebra with emphasis on linear algebra. You may download parts of the book or the entire textbook. It is provided free online in , , , and postscript.
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RANDOM.ORG offers true random numbers to anyone on the Internet. The randomness comes from atmospheric noise, which for many purposes is better than the pseudo-random number algorithms typically used in computer programs.