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The Abacus: Index

http://www.ee.ryerson.ca:8080/~elf/abacus/ What's New Updated: Tue 27 Nov 2012 11:42:57 PM EST Frequently Asked Questions Before you email me, please take a moment to read this list of answers to questions I'm asked most often.
http://www.flashandmath.com/mathlets/index.html Flashandmath.com Site Search In this part of Flash & Math you will find a large and growing collection of self-contained learning and teaching modules for mathematics - math appplets, i.e. mathlets. Mathlets can be used by instructors for classroom demonstration, and by students for self-paced study and exploration. They are all programmed in ActionScript and run in the Flash Player. If you are interested in developing you own mathlets, visit the second part of our site: ActionScript 3 Tutorials for Flash Developers . Come back to our site often for new mathlets!

Mathematics Applets for Students and Instructors - Mathlets

This section introduces some basic cube theory. Understanding a little about the cube's properties will help you to realise what is possible and what is not, as well as help you to see more elegant ways to solve Rubik's Cube. Basic definitions http://www.ryanheise.com/cube/theory.html

Rubik's Cube theory

Useful

geometry

Math

http://www.mathsisfun.com/combinatorics/combinations-permutations.html

Combinations and Permutations

What's the Difference? In English we use the word "combination" loosely, without thinking if the order of things is important. In other words: So, in Mathematics we use more precise language:

Binary marble adding machine

http://woodgears.ca/marbleadd/ Way back when I built my Marble Machine one , I incorporated a few logic-like elements in it, including several divide by two mechanisms, as well as a complicated and slightly unreliable divide by 6 mechanism. It had occurred to me that perhaps with an insane amount of perseverance, it might be possible to build a whole computer that runs on marbles. But my second marble machine was much less based on logic - it was more about just making lots of cool noises. But then I had an idea as to how the divide by two mechanisms from my first marble machine could be cascaded together to actually function as a sort of adder register, or counter.