4D Rubik’s cube

Published on Jun 17, 2016

This video is an introduction to the mysterious 4D Rubik’s cube. Here my main focus is on revealing some ingenious tricks that will allow you to design your own algorithms for this crazy puzzle based on what you already know about the normal Rubik’s cube.

Part 2 of this video is a hands-on introduction to the 4D Rubik’s cube simulator “Magic Cube 4D”. It is hosted on Mathologer 2:
https://youtu.be/Ph6P1Ixfqzk
You can download “Magic Cube 4D” for free from here: http://superliminal.com/cube/cube.htm
If you are really daring/totally insane and would like to try blindsolving the 4D Rubik’s cube or any of the other puzzles included in “Magic Cube 4D”, there is a custom made Mathologer version of the program that you can download from here: http://superliminal.com/cube/mc4d-bli…
(ctrl-d will toggle between greyed out and normal coloured pieces).

Special thanks go to Melinda Green, one of the developers of Magic Cube 4D and the person behind the Magic Cube 4D website for introducing me to the world of higher-dimensional twisty puzzles, answering my many questions about the program and putting together the custom made blindcubing version of the program.

I’ve used the following fabulous programs to generate the clips of 3D and 4D Rubik’s cubes doing their thing featured in this video:

1. CubeTwister by Werner Randelshoferhttps://www.randelshofer.ch/cubetwister/

2. Magic Cube 3D by David Vanderschel http://david-v.home.texas.net/MC3D/

3. Magic Cube 5D by Roice Nelson http://www.gravitation3d.com/magiccub…

4. Magic Puzzle Ultimate by Andrey Astrelin http://cardiizastrograda.com/astr/MPUlt/ and, of course,

5. Magic Cube 4D itself.

Enjoy!

Burkard Polster

Some footnotes (for experts):
1. In a scrambled normal Rubik’s Cube the permutations of edges and corners will always have the same parity, that is, either both will be odd or both even. The four algorithms that I start with (cycling 3 edges, cycling 3 corners, flipping 2 edges, twisting 2 corners) correspond to even permutations of both the edges and the corners. This means that you won’t be able to solve the normal Rubik’s cube by just using these algorithms if the parity of the edge (and corner) permutation is odd. However, on closer inspection it turns out that you can do so if that parity is even. And, if it is odd, just executing one quarter turn will turn these odd permutations into even permutations which can then be unscrambled just using those for algorithms.
2. The face piece and edge piece permutations of the 4D Rubik’s cube are connected in a similar way, that is, either both permutations are odd or both are even. This means that if you get stuck solving the face hypercubies just using the algorithms that I talk about in the video (which all correspond to even permutations of those pieces), just execute a suitable twist and you are on your way. Once the face hypercubies are solved just using our algorithms you can solve the edge hypercubies. The corner piece permutation is always even and can always be solved just using the algorithms derived in the video.

Digital Content

Cory Doctorow describes this problem pretty bluntly as: “If you can’t open it, you don’t own it.”

What You’re Buying When You Buy Digital Content

How Do I Get Rid of the DRM on My Ebooks and Video?

Just as a quick primer here, we should note what exactly it is you’re purchasing when you buy digital content, and why this problem exists in the first place. When you purchase digital content, you’re typically just buying a license to use it. You do not “own” the books or media you purchase in traditional terms. For example, here’sAmazon’s Terms of Use (bolding ours):P

Upon your download of Kindle Content and payment of any applicable fees (including applicable taxes), the Content Provider grants you a non-exclusive right to view, use, and display such Kindle Content an unlimited number of times, solely on the Kindle or a Reading Application or as otherwise permitted as part of the Service, solely on the number of Kindles or Supported Devices specified in the Kindle Store, and solely for your personal, non-commercial use. Kindle Content is licensed, not sold, to you by the Content Provider.P

Most Terms of Use at other digital stores follow Amazon here, and they all also have something similar to this little caveat:P

In addition, you may not bypass, modify, defeat, or circumvent security features that protect the Kindle Content.P

So, just so you know: removing DRM from ebooks and videos is typically against the Terms of Use. Most services like Amazon or Barnes and Noble allow you to store your books or video purchases in the cloud so you can download them again later. But they’re always restricted to their apps.

Epubor Ultimate Converter helps you one-click to decrypt and convert eBooks purchased from Kindle, Nook, Sony, Kobo and Google online eBook stores in batch. This fantastic and award-winning software is a “must-have” tool for all eBook lovers. It’s the most easy-to-use eBook format conversion software ever, and it’s 100% safe with no adware, spyware, or viruses.

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