The One-Answer Question Thread [closed]
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timeless
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i avg40-50 in oh
worth it to learn 2 gen f2l inserts?
worth it to learn 2 gen f2l inserts?
CuBeOrDiE
Veteran
pyraminx edge orientation question
Hi there! If you've been on this forum for a while you probably know me. I'll admit I was very arrogant back then, I'm working on it.
anyway, the question is this: when one has solved a little bar of a pyrminx (two tips, their corresponding centers, and the edge between them, why is it that the number of incorrectly oriented edges left is always even? (when I say "incorrectly oriented" I mean that it can't be solved without breaking apart the little bar mentioned earlier.
Hi there! If you've been on this forum for a while you probably know me. I'll admit I was very arrogant back then, I'm working on it.
anyway, the question is this: when one has solved a little bar of a pyrminx (two tips, their corresponding centers, and the edge between them, why is it that the number of incorrectly oriented edges left is always even? (when I say "incorrectly oriented" I mean that it can't be solved without breaking apart the little bar mentioned earlier.
cubernya
Premium Member
It's impossible to have an odd number of unoriented edges.
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Godmil
Premium Member
You want the resolution for an image that could be printed into a 0.6*0.6 square? It kinda depends on the dpi (Dots Per Inch) of the printer. If you're printing it yourself find out the printers DPI and multiply it by 0.6, if you're getting someone else to print it ask them what resolution would be best.
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CuBeOrDiE
Veteran
okay.... but why?
cubernya
Premium Member
CuBeOrDiE
Veteran
Yeah, I've read this, but there is one thing I'm unclear about. If you take a [[edit: solved]] cube and scramble it (each move making an even number of swaps), it would make sense that the inverse scramble would also require an even number of swaps. But why does ANY solution for this scramble require an even number of swaps? (wait... it does, doesn't it?)
cubernya
Premium Member
1) It's not an even number of swaps, it's an even number of flips 
2) From the page I linked to : "It also turns out that each legal move on Rubik's Cube always flips an even number of edges..." This means that it's not possible to flip an odd number of edges, thus any solution will always flip an even number
2) From the page I linked to : "It also turns out that each legal move on Rubik's Cube always flips an even number of edges..." This means that it's not possible to flip an odd number of edges, thus any solution will always flip an even number
CuBeOrDiE
Veteran
1) It's not an even number of swaps, it's an even number of flips
2) From the page I linked to : "It also turns out that each legal move on Rubik's Cube always flips an even number of edges..." This means that it's not possible to flip an odd number of edges, thus any solution will always flip an even number
1) it depends... a flip is a swap of two stickers, right?
2) Well, you would have to prove the assertion that each legal move always flilps an even number of edges, which brings me back to the question I asked last time (just change the word 'swap' to 'flip'. Just to be clear though, I'm talking about pyraminx (although since it is a twisty puzzle it shares many similarities to the cube)
cubernya
Premium Member
1) it depends... a flip is a swap of two stickers, right?
2) Well, you would have to prove the assertion that each legal move always flilps an even number of edges, which brings me back to the question I asked last time (just change the word 'swap' to 'flip'. Just to be clear though, I'm talking about pyraminx (although since it is a twisty puzzle it shares many similarities to the cube)
1) Yes, but the stickers have to be on the same piece
2) Just do each legal move and see how many edges each move flips, then report back.
CuBeOrDiE
Veteran
1) Yes, but the stickers have to be on the same piece
2) Just do each legal move and see how many edges each move flips, then report back.
hm.... seems so simple, never thought of that ! :fp
But what is a frame of reference for edge orientation in the pyraminx? Haven't been able to find one.
cubernya
Premium Member
I'm not quite sure, but I believe it is insert-able by R U moves. Don't take my word for it though, I'm probably wrong
ZeeK
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does the lubx torpedos work on the guhong v2? i know that the guhong v2 came with torpedos but i like that they are green and i have a set.
onlyleftname
Regular
They don't because the GuHong v2 has a larger gap between the edges than the original GuHong. Anyway, the v2 comes with OEM (Original Equipment Manufacturer) torpedoes.
CuBeOrDiE
Veteran
Lol, that brings us back to square one. (haha, square 1, get it?)
stannic
Regular
frame of reference in the pyraminx
David Joyner in his book "Mathematics of the Rubik's Cube" wrote about how to compute effect of basic moves on the edge orientations of Pyraminx.
http://www.scribd.com/doc/72005543/100/Orientations
You have to mark with "+" one of two stickers on each edge piece in solved configuration. Also, you need to mark with "+" position of this sticker. So you have 6 marked stickers and 6 marked positions. If sticker with mark "+" is in position "+" then the edge piece is correctly oriented, and vice versa.
David Joyner in his book "Mathematics of the Rubik's Cube" wrote about how to compute effect of basic moves on the edge orientations of Pyraminx.
http://www.scribd.com/doc/72005543/100/Orientations
You have to mark with "+" one of two stickers on each edge piece in solved configuration. Also, you need to mark with "+" position of this sticker. So you have 6 marked stickers and 6 marked positions. If sticker with mark "+" is in position "+" then the edge piece is correctly oriented, and vice versa.
Michael Womack
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I want to learn blind but i want to start easy then hard can some one help me learn it
emolover
Legend
I would suggest learning from Zane's tutorial it is explained well and if you still have questions you can post your question in the thread. But make sure you read and watch it thoroughly before you ask.
There are some that are horrid.
Crappy 6x6
As I have gotten sub 20 avg on the 3x3, ( finally! ) I have decided to start moving onto the bigger cubes. My mains are a mini dayan + mf8 4x4, a V cube 5, 6, and 7. The 4x4, 5x5, 7x7 are great cubes for me, but 6x6 pops about one dozen times a solve! I am forced to turn relatively slowly, very frustrating :fp. I have been told to break in cube, but I have been using for about 2 month now... will this require mod? I am not very experienced with mod, I have taken apart and reassembled my 6x6, but it is pain in the butt, so I would rather not. Does anybody have tricks or tips on making my v cube 6 better?
As I have gotten sub 20 avg on the 3x3, ( finally! ) I have decided to start moving onto the bigger cubes. My mains are a mini dayan + mf8 4x4, a V cube 5, 6, and 7. The 4x4, 5x5, 7x7 are great cubes for me, but 6x6 pops about one dozen times a solve! I am forced to turn relatively slowly, very frustrating :fp. I have been told to break in cube, but I have been using for about 2 month now... will this require mod? I am not very experienced with mod, I have taken apart and reassembled my 6x6, but it is pain in the butt, so I would rather not. Does anybody have tricks or tips on making my v cube 6 better?
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