r/mathematics Aug 29 '21

Discussion Collatz (and other famous problems)

193 Upvotes

You may have noticed an uptick in posts related to the Collatz Conjecture lately, prompted by this excellent Veritasium video. To try to make these more manageable, we’re going to temporarily ask that all Collatz-related discussions happen here in this mega-thread. Feel free to post questions, thoughts, or your attempts at a proof (for longer proof attempts, a few sentences explaining the idea and a link to the full proof elsewhere may work better than trying to fit it all in the comments).

A note on proof attempts

Collatz is a deceptive problem. It is common for people working on it to have a proof that feels like it should work, but actually has a subtle, but serious, issue. Please note: Your proof, no matter how airtight it looks to you, probably has a hole in it somewhere. And that’s ok! Working on a tough problem like this can be a great way to get some experience in thinking rigorously about definitions, reasoning mathematically, explaining your ideas to others, and understanding what it means to “prove” something. Just know that if you go into this with an attitude of “Can someone help me see why this apparent proof doesn’t work?” rather than “I am confident that I have solved this incredibly difficult problem” you may get a better response from posters.

There is also a community, r/collatz, that is focused on this. I am not very familiar with it and can’t vouch for it, but if you are very interested in this conjecture, you might want to check it out.

Finally: Collatz proof attempts have definitely been the most plentiful lately, but we will also be asking those with proof attempts of other famous unsolved conjectures to confine themselves to this thread.

Thanks!


r/mathematics May 24 '21

Announcement State of the Sub - Announcements and Feedback

118 Upvotes

As you might have already noticed, we are pleased to announce that we have expanded the mod team and you can expect an increased mod presence in the sub. Please welcome u/mazzar, u/beeskness420 and u/Notya_Bisnes to the mod team.

We are grateful to all previous mods who have kept the sub alive all this time and happy to assist in taking care of the sub and other mod duties.

In view of these recent changes, we feel like it's high time for another meta community discussion.

What even is this sub?

A question that has been brought up quite a few times is: What's the point of this sub? (especially since r/math already exists)

Various propositions had been put forward as to what people expect in the sub. One thing almost everyone agrees on is that this is not a sub for homework type questions as several subs exist for that purpose already. This will always be the case and will be strictly enforced going forward.

Some had suggested to reserve r/mathematics solely for advanced math (at least undergrad level) and be more restrictive than r/math. At the other end of the spectrum others had suggested a laissez-faire approach of being open to any and everything.

Functionally however, almost organically, the sub has been something in between, less strict than r/math but not free-for-all either. At least for the time being, we don't plan on upsetting that status quo and we can continue being a slightly less strict and more inclusive version of r/math. We also have a new rule in place against low-quality content/crankery/bad-mathematics that will be enforced.

Self-Promotion rule

Another issue we want to discuss is the question of self-promotion. According to the current rule, if one were were to share a really nice math blog post/video etc someone else has written/created, that's allowed but if one were to share something good they had created themselves they wouldn't be allowed to share it, which we think is slightly unfair. If Grant Sanderson wanted to share one of his videos (not that he needs to), I think we can agree that should be allowed.

In that respect we propose a rule change to allow content-based (and only content-based) self-promotion on a designated day of the week (Saturday) and only allow good-quality/interesting content. Mod discretion will apply. We might even have a set quota of how many self-promotion posts to allow on a given Saturday so as not to flood the feed with such. Details will be ironed out as we go forward. Ads, affiliate marketing and all other forms of self-promotion are still a strict no-no and can get you banned.

Ideally, if you wanna share your own content, good practice would be to give an overview/ description of the content along with any link. Don't just drop a url and call it a day.

Use the report function

By design, all users play a crucial role in maintaining the quality of the sub by using the report function on posts/comments that violate the rules. We encourage you to do so, it helps us by bringing attention to items that need mod action.

Ban policy

As a rule, we try our best to avoid permanent bans unless we are forced to in egregious circumstances. This includes among other things repeated violations of Reddit's content policy, especially regarding spamming. In other cases, repeated rule violations will earn you warnings and in more extreme cases temporary bans of appropriate lengths. At every point we will give you ample opportunities to rectify your behavior. We don't wanna ban anyone unless it becomes absolutely necessary to do so. Bans can also be appealed against in mod-mail if you think you can be a productive member of the community going forward.

Feedback

Finally, we want to hear your feedback and suggestions regarding the points mentioned above and also other things you might have in mind. Please feel free to comment below. The modmail is also open for that purpose.


r/mathematics 10h ago

Dinitz-Garg-Goemans conjecture is false

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chatgpt.com
265 Upvotes

r/mathematics 6h ago

6 open erdos problems solved by GPT. 5.6 Sol

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71 Upvotes

So 6 open erdos problems were just solved. GitHub link shows both prompts used and solutions verified by lean. All used GPT 5.6 Sol.

The general way to structure prompts is also mentioned in the twitter thread!

Credits: https://x.com/qiaoqiao2001/status/2080003441821163958?s=46


r/mathematics 3h ago

What topic you want to understand if you only had one month to live before you die?

6 Upvotes

Assume you have only one month to live, what topic you. want to understand before you die?

algebraic geometry, topology, cohomology, lie group ....etc


r/mathematics 10h ago

Prime Indicator Function

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19 Upvotes

r/mathematics 2h ago

Young people also at ICM??

3 Upvotes

Hello! I just got to the ICM and found out that literally no one I know is here. the profs, postdocs, PhD students, and fellow undergrads I know who said they’d go earlier in the year all dropped for various reasons in the last couple weeks :( are there any other younger mathematicians who would be down to meet up at some point in the coming days? Always looking to meet new people!


r/mathematics 9h ago

Digit Reversal Function

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10 Upvotes

r/mathematics 6h ago

what minor did you do as a math major

5 Upvotes

im sorry if this is the wrong place to ask but what minor did you choose if you did a math major?? Im honestly having such a hard time and thinking about just not doing a minor. (Maybe stats or Econ ????)


r/mathematics 4h ago

Discussion Laptop or tablet for a mathematics bs degree when I already have a desktop at home

3 Upvotes

I'm starting my freshman year at college with a major in mathematics and I cant find anyone with my particular issue. As it says in the title I'm torn between a laptop and tablet as I fully intend to take digital notes as my paper notes are always unorganized and I lose important things often. A issue with a laptop is I would need to get something to take notes on if I got one and a laptop feel like it will be redundant as I am not going to use it at home. I feel like a tablet with a keyboard would just cover all my needs but I would like advice from people who have already gone through this or any recommendations on what to do.

I've seen on other similar posts that a program called LaTeX will require I have a laptop but is this something I need use during lectures or something I can just use my desktop for. Also for reference I live close enough to my school that I will be going home everyday so that's not the issue.

Before I came to this debate I was looking at laptops and found the Acer - Swift Go 16 AI on sale for for 699$ usd. However if anyone has any better recommendations if you think I need a laptop feel free to send them but I would like to say around the 700$ but don't mind going above it if seriously needed. Also I would like to use windows as I'm not a fan of Mac OS. And for tablets I would also just prefer to avoid apple products as I'm not a fan of them but wouldn't mind if its the only good option.

Additionally for classes I'm taking I will have calc 3 in fall and diff eq in the spring if this effects what I should use lmk.

TLDR: just read the title.


r/mathematics 3h ago

geometry behind autostereograms

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2 Upvotes

recently i studied autostereograms and tried to make them on my own out of curiosity. the outcome was not practically useful at all as there're millions of free resources online that could make autostereograms of high quality. it's the journey that mattered. i learned a lot from it and i'd like to share

at first i was overwhelmed by the amount of variables i had to deal with. the eye separation, the view distance, the background distance, the width of the base pattern, the closest point relative to the farthest point, etc. i got lost. after some struggles i realized it's all about ratio / similar triangles

then everything became simple. we don't have to actually set how far the observer was from the screen, etc. as shown in attached image 1, we let the entire thing to be 1 unit wide and 1 unit high and deal everything inside as ratio

as a math guy i particularly love those variables that lie between 0 and 1. we imagine the observer and the background (the plane containing the farthest point) never move. the screen moves. when the screen touches the background p=0. it's the possible minimum of p. when the screen touches the observer p=1. it's the possible maximum of p. the smaller the value of p, the weaker the 3d effect is

we do the same to the closest point. closest point can be interpreted as the highest point of the 3d scene. we imagine the screen and the background never move. the closest point moves. when the closest point touches the background q=0. it's the possible minimum of q. when the closest point touches the screen q=1. it's the possible maximum of q. the smaller the value of q, the weaker the 3d effect is

let's call p the background factor and q the foreground factor and here's my program. you can run it on browsers. click ▶️ to run. click ⏹️ to exit. when running the program

  • press [q] to decrease foreground factor
  • press [w] to toggle foreground subject (a disc / a sphere)
  • press [e] to increase foreground factor
  • press [a] to decrease background factor
  • press [s] to change background (4 included)
  • press [d] to increase background factor
  • press [x] to toggle caption (off / on)

all backgrounds are function generated. if you have any interesting ideas of making background just let me know...:)


r/mathematics 3h ago

Statistics College math concerns

2 Upvotes

Hello all,
I’m currently in the process of enrolling in classes for my first semester in college. I graduated from high school in 2024 and haven’t had much math experience since. Even while in school, I avoided the complex math classes because it was easy to rationalize that I wouldn’t need them for anything I was interested in- plus it was frustrating that missing a day or two meant a complete disconnect from whatever the next section was.

All of that to say, I’m not too well versed in math, and have made no attempt to sustain most of the information I had.

My current situation:
- I moved to Seattle last year and have obtained residency
- I am working 30-40 hours a week and am making enough to sustain myself, but it’s difficult to save up.
- I’ve enrolled for the fall quarter at Seattle central college
- I don’t know what I want to pursue in school, so I want to have general classes that leave wiggle room to make that choice later
- my partner is a math major

Now the question is- should I take MATH 146? Looking at everything I just laid out, the obvious answer to me feels like no. Taking 146 requires me to concurrently take math 46, which I wasn’t planning on because I didn’t want to overfill and exhaust my schedule since I’m also taking english 101. All three of those classes line up to make my in-person schedule MoWe 8:05-11:35 (eng,46,146)

Again, this is my first college experience. I couldn’t find much information on the subject which is why I’m here. My work is able to accommodate my school schedule and express that they want me to succeed; even with accommodations my hours will still take a slight toll.

If you’ve made it this far, I really appreciate it. Please ask any questions that could help. Thanks :)


r/mathematics 10h ago

Any Applied Math/Statistics majors NOT go CS/finance/medicine route?

6 Upvotes

I'm planning my undergrad degree and would love to hear from people who studied Applied Mathematics and Statistics. I love using math to understand complex systems and am most interested in things like space, weather, oceans, history, culture, and languages. Since I obviously can't major in all of those, I'm considering majoring in Applied Mathematics and minoring in Statistics because it seems like a flexible foundation that could be applied to many different fields. Unfortunately whenever I search for career paths, I mostly find people who went into computer science/tech, finance, or medicine which is fine but I'm not interested in those fields at all. Has anyone here used an Applied Math/Stats background in scientific research or other interdisciplinary fields like the ones I'm interested in. If so, what's your profession? If you're in science, what field are you in? I'd like to know more about using applied math/stats in areas like atmospheric science, oceanography, astronomy, environmental science, archaeology, linguistics, history, geography, or the digital humanities. I'm trying to understand how broad the field really is and what kinds of careers people have actually built with this background. I'd love to hear about any less common paths that you've taken.


r/mathematics 1d ago

Discussion What's a Problem Solver to Do? (PhD Student Looking for Guidance)

90 Upvotes

I'm a PhD student working in probability and analysis, and right now the problem I'm working on could be considered a moderate extension of some existing theory. But it seems like AI is leading to the rapid devaluation of such work and pure "problem solving" as a skill in general (see for example https://davidbessis.substack.com/p/the-fall-of-the-theorem-economy ). If i were to summarize with an analogy - the stock of combinatorialists feels like it is falling while that of people working on geometric Langlands feels like it is rising.

The common sentiment pretty much everywhere seems to be that mathematicians will now be AI guiders and checkers (although the status quo is changing quite literally every day), and those with a wide vision of the entire mathematical "forest" will survive and those who "solve problems for the sake of solving problems" will not or at least will be deprioritized. Honestly, when I think about it, the problem I am working on is small enough in scope that it could probably just be plugged into ChatGPT Pro and solved after some thinking by the model, with no input of my own except a decent prompt. And I have a subscription to GPT Pro, but I still struggle to do that because it just feels so pointless. But at the same time, I feel pointless and obsolete, because - well I am, because my core skillset is problem solving.

Everywhere I look, I see posts stating something to the effect of "solving problems is not the point of mathematics, improving understanding is". And I kind of get it, it's a little evidenced by the counterexample to the Jacobian conjecture, which I saw, and basically said - ok cool, now what? But on the other end, as someone who enjoys struggling with a problem (without thinking about any broader implications), that aspect of math disappearing is deflating. As Paul Halmos famously said:

"Don't just read it; fight it! Ask your own questions, look for your own examples, discover your own proofs. Is the hypothesis necessary? Is the converse true? What happens in the classical special case? What about the degenerate cases? Where does the proof use the hypothesis?"

Sorry, this turned into a rant, but I assume many others are struggling with this transition and I wanted to just get a consensus and some opinions of what people are doing or think is the right thing to do, other than just quit and start feeding questions to AI and become AI guiders. Because if that's what math is going to become, I'd rather not do it and just pursue another field. Literally today, I found a paper on the Arxiv which literally set up a system to autonomously dig through arxiv papers for open problems and then feed them to some kind of LLM to see if it can prove it. Sure, this kind of activity is seeking truth and trying to advance the frontiers of mathematical knowledge - but is this really the point of math? Is this really what it's all about and what it's all going to be?

Here's an example of a non-specialist proving a result which is true just by plopping it into an LLM - it is literally "vibe math":

https://x.com/vikvang1/status/2079370200286433340

The example below is by people who are experts in the field, but basically created an autonomous system to trawl papers for open problems and then feed them into LLMs so that they can find solutions. Big caveat here: I have a lot of respect for the authors - they discuss the impacts of AI in terms of dislocation of early career researchers, and the general societal impacts and how humans are still important. I laud them for that. But still, it's ultimately an automated system to find problems and solve them, almost for the sake of solving them.

https://arxiv.org/html/2607.17388v1

What is the point of working on specialized/non-famous problems and understanding a field deeply if this is what's happening now?


r/mathematics 1h ago

Has GPT solved another Erdos problem?

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Upvotes

r/mathematics 6h ago

What to do with a bachelors in applied math?

0 Upvotes

Hello!

I am going to graduate in December with a degree in Applied Mathematics. I have had a variety of interests through my classes (cryptography, options, optimization, amongst a few others), but I am unsure as to do what I want to actually do once I graduate. I have started to consider graduate school, but I was wondering if I should rule that out since I’m already unsure on what to specialize in. Any advice/discussion is welcome, just trying to hear others thoughts and experiences.


r/mathematics 6h ago

Calculus Calculus 2

1 Upvotes

Hey all. I am studying calculus 2 this summer and my professor has put forward a new criteria for getting an A and a quite unrealistic one at that. He said if using chatgpt or any assistance , we are able to create a new convergence test that has never been presented before (works even if it is applicable for even just a few types of series and fails for others) , we can get a good grade. Is it kinda possible that we do this? Has anybody got an idea. HELPPPP

p.s dont mind my english, its my 2nd language.


r/mathematics 23h ago

Geometry Happy Real π Day!

15 Upvotes

For those that celebrate.


r/mathematics 1d ago

How much recognition/reward would a human researcher receive for the counterexample to the Jacobian Conjecture?

118 Upvotes

Hypothetically let's assume that a human math researcher had come up with the counterexample (along with a class of counterexamples similar to the one given by Claude) to the Jacobian Conjecture before the AI era. How much recognition would that person receive? Is this an automatic tenure at a top university? Does the person become a contender for the Fields Medal? Or is it just a good CV booster but no major impact on that person's career by itself.


r/mathematics 17h ago

Need suggestions for phd

2 Upvotes

My bro has qualified gate and net in maths both exam. Can anyone please tell me best institute/university for phd(maths) and complete procedure. And when university open their application forms for admission


r/mathematics 5h ago

Number Theory Why hasn't we tried using Lean to formally verify Mochizuki's ABC Conjecture proof?

0 Upvotes

I recently learned about Shinichi Mochizuki's claimed proof of the ABC Conjecture through his Inter-universal Teichmüller (IUT) theory. From what I understand, the proof spans around 500 pages and introduces a large amount of entirely new mathematics. The main reason it remains controversial is that several experts, most notably Peter Scholze and Jakob Stix, argued that there is a serious gap or flaw in a key part of the argument, while Mochizuki has disagreed with their assessment.

This made me wonder: why hasn't anyone tried to formalize the entire proof in a proof assistant like Lean?

In principle, if every definition, theorem, and logical step were encoded in Lean, wouldn't it be possible to determine whether the proof is logically valid? I realize formalizing 500+ pages of highly abstract mathematics would be an enormous undertaking—especially since much of IUT theory would likely need to be built from scratch—but would such a project be feasible in the long run?

Or is the difficulty not just the size of the proof, but that there are parts of the mathematics that are still too unclear or disputed to even formalize unambiguously?

I'd be interested to hear from people familiar with formal verification or IUT theory.


r/mathematics 8h ago

Discussion Would there be any interest in a mathematician / programmer collab here?

0 Upvotes

I’m a programmer with an interest in math so I subscribe here. Seems AI is doing a lot of work in this field and I’m sure plenty of mathematicians are interested in leveraging AI. I and other devs have a lot of experience in how to do so. I was thinking that it might be beneficial to have a thread where we work together to try and optimize your setup so that you can utilize these tools more effectively.

This was motivated by a recent exchange in this subreddit where a mathematician was saying "I’ve never heard of subagents" and I realized that you guys might be able to accomplish a lot more if we put our heads together.


r/mathematics 22h ago

Calculus CLEP: OpenStax's Calc 1 book good enough?

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2 Upvotes

r/mathematics 1d ago

Discussion What's one math topic that completely changed how you think?

61 Upvotes

r/mathematics 1d ago

What even is the point of non-integer factorials?

13 Upvotes

The other day, I saw a YouTube video on 1.5! and the Gamma Function, and I understood like half of the maths behind it, but I couldn't really understand why extending the factorial to real numbers and complex numbers is so important. Could someone explain it so a high schooler could understand? Thank you.