Infinity cube
An infinity cube is a kind of mechanical puzzle toy with mathematical principles. Its shape is similar to a ×ばつ2x2 Rubik's Cube, but with a different mechanism. It can be opened and put back together from different directions, thus creating a visually interesting effect.
Construction
[edit ]The principle of the infinity cube is simple and can be made by hand with simple paper cutting and pasting. First, make 8 small cubes, then arrange the small cubes in a 2 by 2 by 2 way, and tape 8 edges together. When combined, there are 28 small squares exposed and 20 small squares hidden inside.
Mathematics
[edit ]The infinity cube has far fewer permutations than the Rubik's Cube.
The Rubik's Cube group has {\displaystyle 43{,}252{,}003{,}274{,}489{,}856{,}000,円\!={\frac {12!}{2}}\cdot 2^{12-1}\cdot 8!\cdot 3^{8-1}} permutations[1] [2] and is isomorphic to the following group, where {\displaystyle A_{n}} are alternating groups and {\displaystyle \mathbb {Z} _{n}} are cyclic groups:
- {\displaystyle (\mathbb {Z} _{3}^{7}\times \mathbb {Z} _{2}^{11})\rtimes ,円((A_{8}\times A_{12})\rtimes \mathbb {Z} _{2}).}
The infinity cube only has 6 configurations.
See also
[edit ]References
[edit ]- ^ Schönert, Martin. "Analyzing Rubik's Cube with GAP". Archived from the original on 2013年01月20日. Retrieved 2020年12月26日.
- ^ Tom Davis, "Rubik's Cube. Part II", p.23 in, Zvezdelina Stankova, Tom Rike (eds), A Decade of the Berkeley Math Circle, American Mathematical Society, 2015 ISBN 9780821849125,