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Infinity cube

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Foldable cube made of die
An infinity cube made of dice being played with
An animation showing different moves and states of the infinity cube (click to animate)

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

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All six configurations of the infinity cube, with the hinges coloured. The configurations can be reached in sequence, with the glow denoting the next hinges to be employed in each step.

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

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The infinity cube has far fewer permutations than the Rubik's Cube.

The Rubik's Cube group has 43,252,003,274,489,856,000 = 12 ! 2 2 12 1 8 ! 3 8 1 {\displaystyle 43{,}252{,}003{,}274{,}489{,}856{,}000,円\!={\frac {12!}{2}}\cdot 2^{12-1}\cdot 8!\cdot 3^{8-1}} {\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 A n {\displaystyle A_{n}} {\displaystyle A_{n}} are alternating groups and Z n {\displaystyle \mathbb {Z} _{n}} {\displaystyle \mathbb {Z} _{n}} are cyclic groups:

( Z 3 7 × Z 2 11 ) ( ( A 8 × A 12 ) Z 2 ) . {\displaystyle (\mathbb {Z} _{3}^{7}\times \mathbb {Z} _{2}^{11})\rtimes ,円((A_{8}\times A_{12})\rtimes \mathbb {Z} _{2}).} {\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

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References

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  1. ^ 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.
  2. ^ 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,
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