• LAVA Moderator: Shinji Ikari

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Each painter's isomorphic image in Z mod 2^17 - 1 is that painter's effect on zero. Profound idea, really. Just lacking a proof...

Perhaps a good start would be to show that the painter permutations are, themselves, isomorphisms; ie, show A(x + y) = A(x) + A(y).

Nope, scratch that; can't be, because A(0) is never 0. Back to the drawing board.

So, the basic question is this: I have 17 functions, commutative under composition. What do I need to show that those 17 functions are elements of a LARGER group isomorphic to Z mod 2^17 - 1?

And why is x_0 = 0 = 000...000 so important?

I think I'm starting to see it. Let f be the "tenative" isomorphism from the "expanded"*** painter permutations to Z mod 2^17 - 1. I'm saying that for all A in {PP}, f(A) = A(0). I think it suffices to show the following two statements:

1. Whenever A(0) = x and B(0) = y, for any A, B in {PP} and x, y in Z mod 2^17 - 1, then AB(0) = BA(0) = x + y. And its easy to show the commutativity part.

2. If D & E are in the "expanded" {PP}, and D(0) = E(0), then D(x) = E(x) for all x in Z mod 2^17 - 1.

***And by expanded painter permutations, I mean all 17 painter permutations, PLUS all their compositions. In other words, the group generated by the painter permutations.
 
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So strange that addition should be the isomorphic function

You think I am going to give you problems with ordinary isomorphic functions!?!?!

NSFW:
;)


Your solution isn't the same as mine, but this problem does have multiple routes. I'd say put up a finalized version in S&T soon, and when you do, I'll show you my solution and we can compare/contrast them.
 
^anyway, I think I found a pretty short & sweet solution (posted in S&T).

It's based on the idea that if one guy painted twice in a row, it would have the same effect as the guy next to him painting once.
 
Yeah, thats all well and good. But when you boink a German chick, you're GUARANTEED anal. In fact, they get pissey if you don't.


Especially true of the older ones.
 
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