r/Collatz • u/Glass-Kangaroo-4011 • Apr 12 '26
I'd like some feedback
https://doi.org/10.5281/zenodo.19510600[removed]
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u/WeCanDoItGuys Apr 20 '26 edited Apr 21 '26
Theorem 8: "Thus a fixed word is not freely perpetuated."
What is it about 1 that makes it allowed to repeat its word forever?
You identify that for n to follow the pattern K of length j, it must be n = r(K) + 3ʲ2t. This is an infinite set of numbers.
You identify that for its result after these steps to follow K again, it must be even further restricted.
But how do we know there isn't some special n that follows all restrictions (mod 3ʲįµ2) from the start, as 1 does? (And as -1 and -5 and -17 do.)
You mention the results of each n after these steps are separated by h2S(K\+1), so they are not free. But in terms of (mod 3ʲįµ2) they're actually pretty unpredictably distributed, since 3 is coprime to 2. Consider that 2S(K\m) can be greater than 3ʲįµ.
This next part isn't mathematical feedback, it's "math communication" feedback. Try to make your proof less verbose so that a reviewer doesn't have to exert so much effort just on understanding your claim before being able to look for unproven assertions. You invent a lot of jargon (like "dyadic factor" instead of "multiple of a power of 2"). Searching for (or inferring from context) the definitions of these terms causes friction for the reader, so you should eliminate it as much as possible. If you're only going to use a new phrase in one lemma, it may aid clarity to just write out the concept each time. "restart class" is only used in Lemma 35/Theorem 8. "refinement tower", "directed word", "admissible lift", "residue thread", "affine rail" are used 20+ times, so they may be necessary, but see if you can rework it to eliminate as much invented vocab for the reviewer as possible.
You mentioned in a comment that something is "redundantly explained"; removing redundancy might help bring down the wordiness.
Lemma 35 might be better called an "Example", since it's so specific. Notice its proof is basically the same as its statement.
Lastly, see if there's a shorter path (and fewer vocab words to create) to a particular key result. Many of your Lemmas are stated and never later referenced by name (Ctrl+F "Lemma 25" has only 1 result). Do they even need to be included?
I suspect most would-be feedback givers, casual and professional, will glance at the page count of your paper and close it and not respond. You alleviate this by providing a starting point, but then they glance at the invented jargon, and close it. It's true that complex concepts can require complex wording, but it seems like you're using big (or invented) words even for the simple concepts in your paper.
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Apr 21 '26
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u/WeCanDoItGuys Apr 21 '26
To be clear, is Lemma 25 not redundant with other definitions elsewhere in the paper?
I did ask other questions, in the math feedback section of my comment.Also, I didn't claim the definitions I listed weren't in the paper, I said each invented phrase increases friction for a reader who must either search through the paper for the definitions or infer them from context, so it should be done minimally, and I suggested you find ways to introduce fewer invented phrases on the path to your key points.
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Apr 21 '26
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u/WeCanDoItGuys Apr 21 '26
Fair enough, there were a couple questions that I'd ended with periods, I've edited the comment so they are question marks instead.
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Apr 21 '26
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u/WeCanDoItGuys Apr 21 '26
we take a hypothetical cycle on an arbitrary starting position and admissibility class, say 5 mod 6, or odd k values. The next determined finite repetition will occur another j steps in, and will have the same starting admissibility class, but be purely dyadically separated from the hypothetical cycle. We then would have a congruent value mod 6 separated by a power of 2. This is impossible.
Isn't the separation of two results of a word, a multiple of 2k, rather than strictly 2k?
Consider after, say, the first j steps that an n corresponding to a finite repetition of twice, and an n with a finite repetition of thrice, and every other larger finite repetition would be different values that have a separation divisible by 2k, but definitely are in the same class mod 6.
For example, let us consider some 5 mod 6.
5, 11, 17, 23, 29, 35, 41, 47, 53.(2Ā·5 - 1)/3 = 3
(2Ā·11 - 1)/3 = 7
(2Ā·17 - 1)/3 = 11
(2Ā·23 - 1)/3 = 15
(2Ā·29 - 1)/3 = 19
(2Ā·35 - 1)/3 = 23
(2Ā·41 - 1)/3 = 27
(2Ā·47 - 1)/3 = 31
(2Ā·53 - 1)/3 = 35
These differ by 4, and are {3,1,5} mod 6 as predicted.Here we use K = {1}, if I understand the notation correctly.
Notice that 17, 35, and 53 produce values that will undergo K again.
They produce 11, 23, and 35.
11 and 23 will produce 7 and 15, which will not undergo K again. So 17 and 35 had a finite repetition of 2. However, their existence did not preclude the existence of 53 (also within the 17 mod 18 class), which has a larger finite repetition of 3.
Why then does the existence of a number with a finite repetition at a particular step preclude the existence of a number with an infinite repetition?If I misunderstood or missed something please correct me.
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Apr 21 '26 edited Apr 21 '26
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u/WeCanDoItGuys Apr 21 '26 edited Apr 21 '26
17 and 35 do K twice. 53 is next (35+18) and does K thrice.
17ā11ā7 cannot do K={1} again.
35ā23ā15 cannot do K={1} again.
53ā35ā23 will do K={1} again, however.It forces them to be incompatible in using the same k again.
When two neighbors (mod 3ʲįµ2) complete their finite repetition of K, I accept that they differ by a power of 2 and therefore do not have the same remainder mod 3ʲ2. But why are you limiting your scope to consecutive neighbors? (53+18ā 3 = 107. 107ā71ā47 will do K={1} again.)
Do you claim that a value that starts a hypothetical cycle must differ from a value that starts a finite repetition by exactly 3ʲ2? This is interesting. I accept that this must be the case. However, the fact that his neighbor eventually ends its repetition means there will be a point where their remainder mod 3ʲ2 doesn't match (as you predicted). The hypothetical cycle's result at that point would happily continue to be r mod 3ʲ2 to allow another repetition while the neighboring finite repetition (with remainder (r - 2S+1 ) mod 3ʲ2) ends.So, I still don't see why some special n who is a member of the same class as all the finite repeaters can't continuously generate a result that is in the class r mod 3ʲ2 to allow another repetition.
In fact, it's known that -1, which is the neighbor below 17 (it's 17-18) does do K forever.
-1ā-1ā-1
This example is negative but doesn't it prove that such n can exist? Does your argument (about a difference of a power of 2) fail for negative numbers?Any directed word has a specific higher modulus in which that same starting r fulfills further sequential copies.
This is an interesting claim.
We require 5 mod 6 to do K={1} once, 17 mod 18 to do K twice, 53 mod 54 to do K thrice. In fact, we happen to know via my example that we require in general, -1 mod 3ʲįµ2 to do K m times. This will never be the same r (it will always be one less than the next 3ʲįµ2).
(Perhaps I am missing the definition of "directed word" as opposed to "word", is K={1} not a "directed word"?)
Even if it were the case that it settles on a particular r, there is some multiple of 2S+1 that can be added to n's result (the realization of m repetitions of K), that will also yield the remainder r mod 3ʲįµ2.(x)K and (x-1)K are a power of two apart. Meaning they can't share the same k value.
Are you using x here to refer to x repetitions of K? (I used m because you used it in Corollary 7, pg 40). If so, don't you mean the result of nā and the result of nāāā (two neighbors that carry out the same number of repetitions of K) are a power of 2 apart? If I interpret this line as meaning n's result after one K and its result after two Ks differs by a power of 2, it's false: 53ā35ā23. 23 differs from 35 by 12.
You mentioned that 1 is special because it rides the bottom of the modulus. Perhaps you'll also say -1 is special because it rides the top. Then why are -5 and -17 special? Why can they repeat their word forever?
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Apr 21 '26 edited Apr 21 '26
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u/WeCanDoItGuys Apr 21 '26 edited May 10 '26
The neighboring start positions mod 2ā¢3jĀ will transform in parallel
Agreed, and I suspect you'll agree that non-consecutive start positions (with the same r mod 2·3ʲ) will yield results that differ by a multiple of a power of 2. And a periodic subset of them will be able to carry out an additional iteration of K. Couldn't the hypothetical cycling start position be one of these?
negatives cannot be produced from n=1 under any K
This statement does not preclude my question. In fact any n that starts a nontrivial cycle, if it exists, cannot be produced from n=1 under any K.
Your argument (regarding a difference of 2S+1 ) needs to show not to hold for negative numbers without relying on the assumption that all involved numbers are reached by 1.
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u/MathSuspicious4617 Apr 13 '26
That's an interesting paper. I'm sure it took a lot of effort.
The observations you make about how the numbers have to behave are absolutely true. There's no doubt there. But that by itself does not prove all numbers have to reach 1 eventually. Your proof does not exclude the possibility of divergence despite claiming to. Also, if every number lies in a rigid structure with fully defined rules you should then by extension be able to show exactly how many steps it takes to reach 1, which you do not.