Joako

Hi, suspicious message here, no clue what it means and user got 101 rep, maybe a bot

Hi. I made a question on MSE (with bounty right now), and so far it got only one answer, but someone made a comment that it could have been A.I. generated

@XanderHenderson the question even states at the beginning: "This post was returned to Mathematics Stack Exchange. It is not currently accepting new answers or interactions." but it is not in MSE, and I cannot edit it or do nothing about it, it is just an issue of time the bot will deleted again. I hope you could help me to unfreeze it in order to make it suitable to SE.

@XanderHenderson That is exactly the menace I talk for, but unfortunately if I click on "edit" I get a message saying that the "post is locked" so there is no much I can do about it (I was thinking to move demonstration to answer section but since I cannot edit neither give answers, I was asking to move it again to MSE which is where it was made)

@XanderHenderson Hi @XanderHenderson. I have asked in CrossValidated Meta here and the do undelete my question, by there are menaces it will be deleted agaim soon: Do you believe there is any chances to migrated to MSE in order to keep it undeleted? I think the demonstrations done are at least are right.

Hi @XanderHenderson, How are you?... I am here to see if you could rescue this question I did: it got migrated to CrossValidated, then got migrated back and deleted by a bot, even when has 4 upvotes. I still working on it and I would like to share it asking for some reviews but deleted as it is now not everybody can see it.

Hi, I made a comment a few minutes ago in a question (which should have led to the author to find an answer by himself), and now I realized the question was deleted by him ¯_(ツ)_/¯ .... I wonder now if it was a A.I. made question so I left you to review the user profile question here

@lyxal so I should get that the event is about chating with people about whatever you like?

@lyxal I still as before... Is about self improvement? speech/elevator pitch? a coding competence? coding best practices? a dating site?

@lyxal what is this event about? (sorry but due my lack of english language I still didn't get it from the Wiki)

@naturallyInconsistent Not saying you are wrong, but for what I have understood so far, the only possible way a solution of an ODE could stop moving if and only if the ODE have a non-Lipschitz term (and I believe that classic daily live things stop moving)... other example is Coulomb's friction when is not linearized, like in these questions 1st 2nd

Hi, sorry to ask this in this maybe not 100% appropriate way, but I want to ask for your help: in the this question I found a way to "frustrate" a 2nd order linear ODE with constant coefficients such it stops moving in finite time, and I want to know if anybody have seen these kind of ODEs applied as a physics model at some point. Thanks beforehand.

Greetings everyone! Recently I made a question now on bounty, thinking it wouldn't be something hard to answer, but it has many views and zero answers (neither votes), so I am worried I have asked something stupid without realizing it and don't knowing why. I hope you could comment here if that is the case. thanks beforehand.

*and is g(t)

*sorry is g'' = -sgn(g')

typing just for keeping this room open

Hi everyone! Could you give me some feedback on a question I have on bounty righ now: I asked to validate an ansatz and I have no answers yet, even when Wolfram-Alpha tells it kind of work, so I am worried about if the question is something too stupid to get attention, or instead unintentionally I asked something too hard for an answer (I have very limited background on PDEs so I cannot judge this by myself)... I hope you could help me.

@XanderHenderson Hi. I made a question on MSE (with bounty right now), and so far it got only one answer, but someone made a comment that it could have been A.I. generated

Hi everyone... I came to ask if recently people had experienced issues trying to join into the MSE community like the one I am having here?

I understand now. Thanks.

@XanderHenderson I am asking about curiosity, since sometimes questions got accepted for migration and sometimes not, with similar merits.

and what stop any user to make the delete/repost migration by themselves on any post? I mean, It is done as migration for keep answers/comments on the question? Or it is just simpler to just delete/repost that asking for migration? (I believed -mistakenly I see - that migration was a prefered procedure so the question don't got flagged and closed as duplicates)

Hi admins... I have a short question about the website: Which are the policies for deciding when is worthwile or not to migrate a question to other stackexchange forums?

Hi everyone, in this question I am trying to prove that g(x) = g0+sgn(g'0)/2[|g'0|^2-(|g'0|-t)^2\theta(|g'0|-t)] solves the equation g''=-sgn(x'), I hope you could comment if at least it makes sense (without answers neither comments I don't know if maybe it is just bollocks). Thnks

Hi everyone, I got a question about the expected value of the hyperbolic cosine of the standard Brownian motion, which has an answer here, but I would like to someone else to review it since following what I saw in a YT video it could be mistaken (and I aiming to use it).. I left a comment by the way, with the mentioned video

@Sycorax If the spirit of the website is having a library of good questions and answers, deleting just because math demonstrations are too long is kind a catch22 situation

@Sycorax the question is simple and focused, if you see the editions it grows given my efforts to answer it (which I finally did, with demonstrations done step by step, using code also as benchmark), based on the comments and answers I received (very good indeed), which it has a few... it has 4 upvotes and accepted answers, and I just review the site and extension is not a reason for deleting answers, even more, questions with accepted answers shouldn't be removed by bots

Hi everyone. I am here looking for a CrossValidated moderator assitance. I did a question here with 4 upvotes that got deleted by a bot. First it got migrated from MathStackExchange to CrossValidated, then it looks it got migrated back and then deleted by a bot. I am still working on it and I would like to share it asking for some reviews but deleted as it is now almost no one can see it. I hope you could help me.

@CalvinKhor Thanks for your time, you have been already very helpful. In this question I finally did the question I had on mind while looking for a simple example... you will see there my opinion on "traditional math" lol

@CalvinKhor And the last question, In your experience, Do you think it worth the time to explore solutions of the form $y(t)=\sum_{k=1}^N a_k(T-t)^k\theta(T-k)$?

@CalvinKhor In your experience with the FDE: Have you read somewhere any explanation about why these kind of solution that achieve rest-state losses degrees of freedom?

@CalvinKhor You have been really helpful, the examples you shared will help me to explore and show other people the existence of these kind of alternatives. Thanks you very much

@CalvinKhor but out of jokes, it could have some nuances in how results are interpreted, if math works as a microscope to see what we can't see with equipment, traditional math has some resolution issues: dynamics solutions cannot determined accurately when something stop moving, I explore some issues here

@CalvinKhor oh too bad.. I have been very interested on them, I can't believe I have been able to find examples and solve them with the limited knowledge I have, and some how, they are very unknown, is like the scientific community on purpose decided to forget classic systems stops moving lol....

@CalvinKhor Do you know if in the math literature these kind of solutions of finite duration are named or grouped in some specific term in order for search for them? Had been really hard to find by myself related literature, and since you have shared plenty of them maybe I had been using the wrong terminology (I have recreated many of the equations in order to have simple examples since I don't find them when I search for them)

@CalvinKhor Thanks for the comment. I have to read it in detail yet, it is not an easy read for me.

@K.defaoite I believe that in the update I just uploaded I show that somehow the ansatz do solve $\nabla |u|^{\frac12}=0$, but I am stuck on how to give it boundary conditions, even I don't know if is possible or not meaning the ansatz it just wrong. Hope you could take a look.

@K.defaoite I added what I can do for the case $u_t=\Delta|u|^{\frac12}$ but as on the previous one, is little what I can do since I don't understand the issues with initial/border conditions. Hope you could deliver a simple example with solutions of finite duration. Thanks.

@K.defaoite I appreciate your feedback, but as I don't know which are the differences you mention, I cannot tell you anything in favor of one or the other alternatives. My intention is to make ANY simple PDE with solutions of finite duration so I can start studying it, so if you want to focus in any you felt is more affordable is completely fine with me. As you could see my knowledge on PDE is not zero but is pretty basic, and all help is welcome, but if I start for the very abstract paper I am certainly be as lost at the end as I am now.

@AlexRavsky I have answer your observation as an Update since it wasn't fitting the comments' character number restrictions. I hope is clear now.

@K.defaoite I added what I am trying to do with the better explanation I can do (do my background on math and in English - I am not native in it and still struggle a lot). I hope it is clear enough to receive help on it.

@K.defaoite probably, I understood very little from the paper. As I said I am looking to make simplest possible example from PDE with solutions of finite duration so I can study it, I find examples very illustrative. So far the nearest I have found is the one of Eq. 11 on this other question, but the solutions is a smooth bump function so I don't know how to find its Fourier Transform

@K.defaoite I was thinking on $\partial_x^2+\partial_t^2$ with $x$ an spatial variable and $t$ the time, and tried to use something like $\varphi=x\pm t$ on a similar ODE on the variable $\varphi$ to make an ansatz for these PDEs since they look similar

@K.defaoite maybe I should change the title of the question from "... 2 dimensions" to "$\mathbb{R}^{1+1}$ dimensions?

@K.defaoite here you caught me off guard. I was thinking on the wave equation and tried to split the phase as is done on the 1D wave equation, but I am aiming to make the simplest PDE example of finite duration solutions of these equation with the lowest dimension possible, to see if I can reproduce was is done on the paper shared by (at)CalvinKhor on his comment here (paper where I understood very little)

@CalvinKhor In this question I think I found a finite duration ansatz for solving a similar equation than the ones you mentioned $\nabla |u|^{\frac{1}{2}}=0$, hope you could take a look

@whpowell96 I added to the question why I believe this question is not the same as claiming an answer to the NS Millenium problem, if I am mistaken, I hope you could correct me

@CalvinKhor they are looking then if the NS stand solutions like smooth bump functions? recently I made a question related to them. What make noise to me is that the answer to $y'=-sgn(y)\sqrt(|y|)$ is neither a distribution neither smooth.. Does this mean there are found similar solutions to the NS equation?

@CalvinKhor I added you comments into my question. Thanks you very much.