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12:48 AM
"What do you do when you find yourselves with an unreadable/inaccessible paper?" You do like the pros: fake it.
 
 
4 hours later…
vzn
4:58 AM
@NovaliumCompany capitalism has a substantial dark side that is becoming more apparent aka "neoliberalism, late stage capitalism, predatory capitalism" etc. one model along the lines you propose is widespread nonprofits, my understanding is canada has success with this model. think JR has point about trying to avoid dualistic thinking wrt political/ economic philosophies. & marx was far more prescient than anyone gives him full credit for. he basically was focused on/ foresaw wealth inequality...!
+ try their chat room

 The Classical Channel

General chat for Quantum Computing SE. For MathJax see meta.st...
 
@vzn I've never said that capitalism is better than communism and I've never said that capitalism has no flaws. What I'm saying is that I have two views on the subject: If I had to choose a government for myself to live in, I'd choose a government which allows me to personally get my hands on huge resources which I can allocate to places of my choice. I'd want to have control over what's going on and not just submit ideas and patents to a board of people.
The second point of view I have is that if I had to choose a government system for the world, I'd choose a system that allows for the most productivity and innovation, not necessarily happiness or equality. I know this might sound a bit wrong, but that is me. I'm not saying that people should not feel good, I'm saying that, in my opinion, innovation and productivity are more important than the release of dopamine in someone's brain.
 
vzn
5:43 AM
@NovaliumCompany read what you wrote. like that you seem to be trying to think out of the box, and applaud that. some would say the results are in on capitalism, and that its a failure. some new system(s) need to be devised/ put into play ASAP. its happening as we speak. a lot is riding on it. future of humanity, future of the planet/ nature. you outline the key areas to address. innovation, productivity, resource allocation, happiness, (in)equality, dopamine, etc lol...
 
6:02 AM
@vzn Sorry I don't know what you mean. I'm not proposing a new system nor do I applaud myself. I'm expressing my opinion on government systems or more specifically, "if I had to choose" opinion.
 
vzn
6:17 AM
@NovaliumCompany your comments envision a different system than the one we are living in. am applauding you for "thinking outside the box" which, as mass panic/ hysteria now surrounding us underlines, is sometimes an uncommon feat. sometimes conventional wisdom is highly overrated (to say the least... more precisely, sometimes its nearly crazy). en.wikipedia.org/wiki/Shoshin
 
6:41 AM
@vzn Yes, as far as I know, no government today is truly capitalistic, socialistic or communistic.
 
7:29 AM
@ACuriousMind what?
Regarding my yesterday's comment?
 
@YuvrajSingh... You can click on the little arrow on the right to reply to specific messages when you mouse over the message. Right now I'm afraid I don't know what you're referring to.
There were plenty of messages here yesterday :P
 
I've had it with the "I didn't mean that" replies to thing that are clearly insulting by any possible interpretation
By acm
I am on my phone.
@ACuriousMind
 
@YuvrajSingh... And what exactly do you want from me? I don't really have an interest in revisiting that discussion unless it's absolutely necessary.
 
user434058
"Your shadow is a confirmation that light has traveled nearly 93 million miles unobstructed, only to be deprived of reaching the ground in the final few feet, thanks to you."
 
@ACuriousMind you have habit of misunderstanding?
 
7:43 AM
Sorry, I'm not in the mood to try to guess what you're talking about. Please state clearly what you want from me and how it relates to what I said, or otherwise don't ping me.
 
7:55 AM
@Slereah Is there ever a right time to deal with the jet bundle? :P
 
 
1 hour later…
9:25 AM
 
Mar 31 at 15:58, by Slereah
I say we burn the witch
 
me too
 
10:04 AM
86
Q: Why is $\frac{987654321}{123456789} = 8.0000000729?!$

marty cohenMany years ago, I noticed that $987654321/123456789 = 8.0000000729\ldots$. I sent it in to Martin Gardner at Scientific American and he published it in his column!!! My life has gone downhill since then:) My questions are: Why is this so? What happens beyond the "$729$"? What happens in bas...

 
user434058
10:16 AM
-1
Q: school suspention

Rrr Rrrcan you get suspended from school if somebody fought you and even if you didn't fight back I heard that some people said that this happened is this true and if it is then why do they suspend you because they don't know if you punched the other or not or that is the rule they want to suspend every...

 
user434058
....And this was posted on Sound Design SE :D
 
sounds pretty sad to get suspended for getting beat-up
IRL can a person be sent to jail for being assaulted?
(neglecting police brutality, of course)
 
Whenever you find yourself hearing one side of a story immediately ask yourself whether the account you've heard is objective and what the other side of the story might be.
 
disclaimer: you need to first aware that you are on one side of the story
 
true, completely random acts of violence are rare
 
10:25 AM
the same idea as I need to first made aware I have a question to ask before I can ask a question
and that is something that cognitive bias like to filter away
and this is even worse when there is ideology involved as the ideology act as a filter to make you not even aware you need to question
 
 
1 hour later…
12:09 PM
@tpg2114 Hello, I hope you're fine and well. I'm about to do the whole experiment we talked about. One thing that's a bit unclear is, how am I going to remove the baked polymer clay model out of the plaster mold? Will the polymer clay stick to the plaster mold while the plaster mold is being formed?
Would it be easier if I don't bake the polymer clay model and I make the plaster mold around the unbaked polymer clay?
If I do so, would the plaster mold turn out still as good?
 
@FakeMod I see you made a friend in some comments on a meta question today.
 
12:26 PM
is the sleepless one back?
 
user434058
12:38 PM
@JMac I regret doing that :)
 
@JMac @FakeMod For the record, engaging was absolutely superfluous there. That doesn't excuse the other user's behaviour, but...just flag rude comments by other users and don't engage. If someone has started throwing abuse around it is extremely unlikely you will convince them to stop doing that and highly likely you'll just produce more stuff that needs to be deleted later. Let the moderators take the abuse and move on.
 
@FakeMod Yeah I noticed you stopped responding and I figured you realized it was a mistake lol
 
user434058
@ACuriousMind I just felt the guy was too ungrateful, but I will control myself in the future.
 
I can understand the urge to debate people that are on the border of rudeness, but once someone is just shouting slurs, just walk away. Such behaviour is not welcome here, there is no need to normalize it as something that merits any other response than silent deletion.
 
user434058
Sure. Thanks!
 
12:46 PM
@NovaliumCompany not sure on that, I don't think it should stick but you might need to put a release agent on the clay. They use plaster of Paris to make face masks of people and all kinds of stuff, but they might need to put something on the face first
I'd give it a test on a small thing so you don't waste your resources and see if it releases or not, before you do it on your actual model
 
I remember making plaster masks for a play in school, but I can't remember how exactly it worked...it's been a while
 
1:39 PM
@Slereah If $$ T_{\mu v} \stackrel \Delta = \frac{1}{\delta g^{\mu v} \sqrt{-g}}.\frac{\delta(\mathcal L_m \sqrt{-g})}{\kappa} $$ then can I change it to $$ T_{\mu v} \equiv \frac{1}{\kappa \sqrt{-g}}.\frac{\partial (\mathcal L_m \sqrt{-g})}{\partial g^{\mu v}} $$?
 
Is it equal to that
Also do you know what $\delta$ mean
 
@Slereah yep, can you check that? I replaced that to partial derivatives, due to chain rule...
@Slereah variation
 
The action gets variated
For the Lagrangian, that's just an ordinary derivative
 
@Slereah Terms too...
The Einstein–Hilbert action (also referred to as Hilbert action) in general relativity is the action that yields the Einstein field equations through the principle of least action. With the (− + + +) metric signature, the gravitational part of the action is given as S = 1 2 κ ∫ R − g d 4...
 
I know
 
1:41 PM
^ see the equation just after equation (2)
 
It's a bit of an abuse of notation
or it represents the variational bicomplex or whatever
 
@Slereah I'm love with that notation for unknown reasons, pen flipping, probably
@Slereah no. variation only
 
but yes, it's basically just a derivative
 
@Slereah Omg.... Is my step right?
 
2:00 PM
Hm...the IT spyware on my work machine just warned me that I'm using more than 10 browser tabs and this "might impact the performance of [my] device". This thing might've been written by someone not exactly familiar with many people's browsing habits or the capabilities of modern hardware :P
 
@ACuriousMind If you think that 10 tabs can't affect modern hardware, then sit beside a computer with chrome having 10 tabs open... Good place to melt ice.
 
@ACuriousMind "Our scans show that this is an actual computer, not an original raspberry pi, disregard the previous warning."
 
@AbhasKumarSinha This thing has 32 GB RAM and an eight-core i7 processor, it can handle a few (=hundreds) poorly optimized browser tabs.
 
@ACuriousMind Which mobile has 32 GB RAM?
 
...mobile? I didn't say anything about mobiles, it's a laptop.
 
2:07 PM
k
 
@JMac Sadly it would be perfectly in character for that to pop up instead of just suppressing the warning in the first place :P
 
For the first time in the history, I wrote Stress Energy Tensor of a field, in a single try absolutely correct with non-adhoc method... Ama celebrate this by opening 100 tabs....
 
Who's Ama?
 
It's I'm/I'll
I mean I'll here
 
That's imma, not ama.
 
2:15 PM
We write ama here often... Ik, in other english they do like that...
 
Who is "we"? This is the first I can recall seeing anyone use it.
 
we are human beings
 
-_- Who are the human beings who write "ama" often here? This is the first I've noticed anyone using it.
 
I mean we are human beings currently in the chatroom... Ama is different thing, It's I'm/I'll (often used this region) just as woods howdy cwtch are regional words...
 
I have no idea what you just said. Can you not just answer the rather straightforward question of who you mean by 'we' and what place you mean by 'here'?
 
2:22 PM
@ACuriousMind You don't know the meaning of we ? here refers to Indian Subcontinent...
 
@AbhasKumarSinha So by "here" you meant where you live, not "in this chat". It would have been a lot clearer if you just said that when I asked to clarify "who is we". Saying "we are human beings" didn't make it any clearer that you were talking about your region.
 
@AbhasKumarSinha See, 'I meant Indians' then would've been a perfectly fine answer to Jmac's initial question.
 
@JMac ah... I understood,pronouns can be misleading sometimes
@ACuriousMind I initially misunderstood his questions.
 
@AbhasKumarSinha Obviously here refers to the chair in front of my computer... Usually when you say "here" in those contexts it implies both people in the conversation are at the place you're talking about, or you're directly indicating what "here" you mean (like if there were a picture of a map included).
 
@JMac okay....
 
2:26 PM
I'm a bit puzzled at the assumption that someone would be randomly asking about the general meaning of the very basic word 'we', but whatever.
 
@AbhasKumarSinha It's just really good to be clear, especially with text. Being unclear makes conversations a lot more tedious than they need to be.
 
@JMac fun fact: Today it's sunny and warm enough that I have to either keep the shades closed or the window open so that the room doesn't get too warm. These passive houses make really good heat traps.
 
@ACuriousMind Too efficient for it's own good.
 
@ACuriousMind it is an absolutely glorious day in Chester.
 
Yeah, here too. Not a cloud in sight.
 
2:35 PM
There was heavy snow here this morning. It only lasted about 10 minutes and it's sunny now... but still.
 
:-)
272K !!!
 
"Locations: New Brunswick.

Total snowfall: 15 to 25 cm.

Maximum wind gusts: 50 to 80 km/h.

Time span: Thursday through later Friday." And yes, they mean _this_ Thursday
I'm just glad we actually had a really mild winter this year.
 
I miss snow, there wasn't any this winter :/
At least none that would've remained on the ground for more than a few minutes
 
2:47 PM
If there's one Canadian stereotype that usually holds, it's snow in winter.
 
Why cant a wave function and its derivative both vanish at a point?
The answer is that for a 2nd order equations like Schrodinger equation,we have unique solutions,and 0 is a solution because it satisfies the boundary conditions.
so wave function vanishes for all x
But, x^n for any natural number n also satisfies the condition.So wave function need not be 0 everywhere by this?
 
@ManasDogra But $x^n$ does not fulfill the Schrödinger equation.
 
3:05 PM
Doesn't it for $n = 1$
 
@Slereah But for $n=1$ its derivative doesn't vanish :P
 
What about $n = 0$ then
 
That's the case Manas was trying to find an alternative to!
 
Oh well
 
Wait, no, it just doesn't vanish itself because it's the constant 1.
 
3:10 PM
Really 0 is the only unique solution to the differential equation with such boundary conditions?

Are there other ways to prove this maybe?
It means physically that--"Momentum of a particle cannot vanish at nodes",can we arrive at this from other intuitive reasons?
 
@ManasDogra There is no "intuition" because it's not true for completely arbitrary systems, only for nice once. For the TISE in one dimension, the uniqueness theorem that applies is Picard-Lindelöf, but if your potential fails to be Lipschitz you get non-unique solutions, just like with classical Norton's dome.
 
Alright!
 
But if you accept the classical statement that a particle "cannot" start to move without a force acting on it because $F=ma$ has unique solutions, then you should also accept the quantum statement that the wavefunction "cannot" have both itself and its derivative vanishing at a point about the SE has unique solutions
 
This is what I was looking for!
Thanks
 
3:19 PM
Virtual Public Lecture by APS.
 
Does string theory and quantum mechanics have any kind of relationship or similarities?
 
@YuvrajSingh... quantum mechanics is a somewhat loosely defined term.
 
OK n
Quantum theory?
 
For example it encompasses the Schrodinqer equation, Dirac equation and quantum field theory as well as string theory.
 
Oh!
Yes.
I am dumb
I should have use quantum field theory?
@JohnRennie
 
3:31 PM
String theory is a quantum theory because it is quantised, but it is different from quantum field theory and different from the Schrodinger equation.
 
What quantum theory says about quarks?
@JohnRennie
 
The problem with trying to explain even quantum field theory is it is based on some really complicated principles that you wouldn't learn until well into a physics degree. String theory uses even more complicated maths and you probably wouldn't learn it at all at degree level. You'd learn it as a postgraduate course.
 
I will try, please sir?
 
@YuvrajSingh... quarks are described by quantum field theory. The concept of a particle arises naturally in QFT, though it's hard to explain exactly how this happens in simple terms.
 
You will surprise that from at least 7 days I am learning a bit of string theory!
 
3:37 PM
It does no harm to try and learn a bit about string theory, though I'd be surprised if you get far. What book, web site or whatever are you learning from?
 
Some professor lecture from Harvard University!
 
On YouTube?
 
No my brother shared an pendrive!
 
What is the name of the professor?
 
John Doyle if I remember correctly!
 
3:41 PM
@YuvrajSingh... Cool, me too...
@JMac k....
 
@JohnRennie look similar, but yes face is little bit different!
 
@JohnRennie He seems very close to a uncle living in front of my house... very close.
 
I even have Brian Greene lectures.
@AbhasKumarSinha wow, you are very close to uncle XXD:-((-::-[:'(:-)
 
@YuvrajSingh... 10 feet away, he lives in a house, which is around 10 feet away.... (opposite door, btw)
 
3:45 PM
Trying to learn string theory without having a good understanding of quantum field theory - and ideally CFT in particular - is not really advisable
 
Yes same advise was given by my brother, but I know a bit QFT.
 
because lagrangians require FT a bit
 
@ACuriousMind if I were an enthusiastic undergrad right now I'd probably be attempting (and failing) to understand string theory lectures. I don't think it does nay harm.
 
@JohnRennie Sir, I've a question, (after this conversation), please ping me, It'd not take more than a minute...
 
3:48 PM
You can ask now. I don't think we're talking about anything very important.
 
@JohnRennie Freudian slip with the double negation there? ;) Sure, doesn't hurt, I just wouldn't get my expectations up about understanding any of it except the most superficial stuff.
 
Slreah didn't answer my question, he's busy...
2 hours ago, by Abhas Kumar Sinha
@Slereah If $$ T_{\mu v} \stackrel \Delta = \frac{1}{\delta g^{\mu v} \sqrt{-g}}.\frac{\delta(\mathcal L_m \sqrt{-g})}{\kappa} $$ then can I change it to $$ T_{\mu v} \equiv \frac{1}{\kappa \sqrt{-g}}.\frac{\partial (\mathcal L_m \sqrt{-g})}{\partial g^{\mu v}} $$?
@JohnRennie Can I do partial derivatives^?
 
I have absolutely no idea.
 
@JohnRennie hmmm....
Okay.... sir...
@JohnRennie I did hit and trial, works on all classical fields... but didn't try on other fields...
@JohnRennie Another question... $A_{ij} = B^i C_j$? Is that correct or $A_{ij} = B^iC^j$?
 
Neither of those make sense ...
 
3:52 PM
You're once again writing down things which make no sense in standard notation.
 
@ACuriousMind Can you give an example please...?
 
You raise or lower indicies using the metric.
 
@JohnRennie example please... I'm a noob here...
 
Suppose you have a vector $x^\alpha$.
 
okay....
 
3:55 PM
You can lower the index to produces it's dual vector using $u_\alpha = g_{\alpha\beta}x^\beta$.
 
@JohnRennie I can only do that with a metric tensor? not other tensors?
 
where the repeated index is summed over - this is Einstein notation.
I just need to answer a question in another room. Won't be a moment ...
 
okay sir...
 
@AbhasKumarSinha BTW, you really don't need to ping me if your responses are just gonna be "okay..." or "k..." That's not really much of a conversation, so pinging me doesn't accomplish much. It's not clear if you're expecting me to say something else, or just trying to acknowledge that you read it (especially with the ellipsis at the end).
 
@JohnRennie I remember that magical moment when Einstein notation changed my life.... I think I might actually have dropped my pencil.
 
4:11 PM
@nitsua60 What's cool with dropping summations?
 
@AbhasKumarSinha tensor crop up all over physics, but only in differential geometry is there a distinction between vectors and dual vectors.
 
@JohnRennie k, can raising and lowering indices only with metric tensor?
 
So for example torque = moment of inertia times angular acceleration is a tensor equation using the moment of inertia tensor.
But in this case we don't have raised and lowered indicies.
 
@JohnRennie Not so sure that about, linear algebra already has this distinction, and the physicist does reflect this in Dirac notation with bras and kets.
 
True ...
 
4:15 PM
k..... But, is it true $a_{ij}b^j = c_i $ for $a_{ij} \neq g_{ij}$?
 
It's true. The question is whether it's physically meaningful.
 
@JohnRennie no, Just mathematically? Is that mathematically true?
 
Yes
 
@JohnRennie okay... then $A^{i} B^{j} = C^{ij} $?
 
Are these supposed to be equations between known quantities, or definitions of the r.h.s.? It's not really meaningful to ask whether an equation is "mathematically true" when you haven't really defined any of its constituents
 
4:18 PM
because $g^{ij}$ is said to be inverse of $g_{ij}$
@ACuriousMind I mean, can Tensors be multiplied like that (in mathematical sense), if something is not true mathematically, then I can't use those in physics...
 
Tensors are mathematical objects
Therefore it can only be mathematically true
There are no tensors in the night sky
 
@AbhasKumarSinha I guess $A^iB^j$ would be the tensor product of the vectors $A$ and $B$.
 
yes sir, tensor product..
 
@AbhasKumarSinha You haven't answered my question. Are you trying to define a 2-tensor $C^{ij}$ by that equation and you're asking whether the l.h.s. is really a 2-tensor, or are $A$, $B$, $C$ known quantities defined by something else.
 
So yes it would give a second rank tensor with two upper indicies.
 
4:22 PM
@JohnRennie okay...
 
Because if, say, $C^{ij} = A^i A^j$ by definition, then $C^{ij} = A^i B^j$ is clearly false.
 
@ACuriousMind got the answer... It was about ranks of tensor.
 
But ACM's point is sound. In a sense that is a definition of the tensor $\mathbf C$
 
@ACuriousMind no, not for fixed $A, B, C$, I mean if in any specific ones (if exist)
 
i.e. you are choosing to define the tensor C in terms of A and B using that equation.
 
4:24 PM
Is this true? $ds^2 = g_{\mu v} \otimes x^{\mu} \otimes x^{v}$? for metric tensor?
I want to ask, if there's any reason dropping $\otimes$ there^?
 
You don't write $\otimes$ together with the indices.
 
@ACuriousMind means?
 
You either write $C^{ij} = A^i B^j$ or $C = A \otimes B$. $C^{ij} = A^i \otimes B^j$ doesn't mean anything.
And $x^\mu$ is not a tensor.
 
@ACuriousMind vector? na?
 
$x^\mu$ is a component of the tensor $\mathbf x$
 
4:27 PM
In general it's just a coordinate, not a tensor.
 
@ACuriousMind Okay, so, we don't write indices with $\otimes$?
then why they are $x^{\mu} \otimes x^{v}$ here? - en.wikipedia.org/wiki/…
 
They aren't. Look again, you deleted the $\mathrm{d}$s.
 
@ACuriousMind didn't get it...? Have I written wrong?
 
@AbhasKumarSinha consider the good old dot product. You might write it as $\mathbf a \cdot \mathbf b$ or you might write $a_ib_i$, but you wouldn't write $a_i \cdot b_j$
 
I'm afraid I do not know how to express myself any clearer than that.
 
4:31 PM
@JohnRennie okay...
 
Are you just taking random equations off Wikipedia and asking us if they're true?
 
@AbhasKumarSinha that equation from Wikipedia is more complicated than it appears
The $dx^\mu$ there is not simply the component of a vector.
 
It's ... erm ... um ... I don't really understand what it is if I'm honest, but it's a vector not a component.
 
@JohnRennie Okay.... Yes... exactly this... So, $dx^{\mu}$ is also a tensor?
 
4:33 PM
I also find it very peculiar that you are now asking extremely basic questions about tensor notation when months ago you tried to ask me rather specific questions about the Ricci tensor
 
@ACuriousMind trying to run before you can walk is a time honoured tradition amongst young physics students. I think we should at least admire the enthusiasm.
Even if it can lead to spectacular crashes.
 
@ACuriousMind Why $\otimes$ is dropped here?
@ACuriousMind also, they are not a component..
as you said.
 
@AbhasKumarSinha that's because $dx^\mu$ is being used to mean different things in those two equations.
 
@JohnRennie Doesn't seem.... He just dropped that because of some unknown reasons.... But, I still think your way..
@ACuriousMind no
Are $g$ and $ds^2$ different here?
 
No, the $\mathrm{d}s^2$ is just the "less mathematical" notation.
 
4:38 PM
okay...
 
@AbhasKumarSinha physicists tend to commit grave sins against mathematics in their approach to differential geometry.
Their justification is that it works.
 
@JohnRennie Okay... Now, this feels better to me... I'm not alone :-P XD
 
Hedge physicists like me will quite happily write $ds^2 = g_{\mu\nu}x^\mu x^\nu$ event though mathematically this is not true.
 
I too use that way^
 
If you're interested in doing this sort of thing correctly you should probably look for a maths course on differential gemoetry.
There are maths courses aimed at physicists where they take it easy on us :-)
 
4:43 PM
@JohnRennie Okay.... I was just confused with $\otimes$ thing so, I was afraid of doing raising and lowering indices, because it can get wrong... But, now this makes sense...
@JohnRennie I too see in machine learning, they use distribution function notations which are not usually used in Mathematics... they are bit misleading, but people don't care,... :P
 
user434058
5:21 PM
Sorry!
 
Please do not discuss the suspensions (current or past) of other users here unless absolutely necessary.
 
user434058
@ACuriousMind Alright! 👍
 
6:04 PM
0
Q: Should I use VLQ flags for inadequate/one-line answers?

FakeModI am a bit confused about how to use the VLQ flag. I saw this one-line answer and thus left a comment asking the OP to elaborate and at the same time flagged it as a VLQ answer, because the info of VLQ flag states that: Very Low Quality: This answer has severe formatting or content problems. ...

 
So someone has cast a vote to close on a question. Can anyone help me modify the question?
0
Q: Proving measurements are instantaneous experimentally?

More AnonymousQuestion I was wondering if the sort of experiment below (or variant) below was already done? Experiment Let's say I have I begin with momentum eigenstate $|p_1 \rangle$ after a time interval $\Delta t_1$ I measure momentum again. Then the probability of the transition to $| p_2 \rangle$ is g...

 
user434058
6:38 PM
Good midnight!
 
@FakeMod gn
 
Apparently there's like a "ghost ship" phenomenon in my local area. I might have to try to see this for myself sometime. en.wikipedia.org/wiki/Fireship_of_Baie_des_Chaleurs
 
@tpg2114 Okay thanks, will do.
@JMac "It takes the form of an arc of light" that's called a sunrise. someone has been drinking a lot
 
@MoreAnonymous I'm not quite sure what the close voter was looking for in your question. It certainly doesn't hurt to ask for advice, but if it's just one close vote and you don't get any other feedback suggesting improvements, I wouldn't worry about it. Quite a few questions accumulate one close vote and that's as far as it goes.
 
@NovaliumCompany The path of the sun takes the form of an arc; but the sun just takes the form of a huge ball typically.
 
6:44 PM
holy crap we're already 1/3 of the way through 2020?
 
@JMac great, I'm wrong even when my making jokes yay
@JMac that's called a moon eclipse, someone has been drinking a lot
 
7:00 PM
@DavidZ thanks
 
@SirCumference Feels more like 1/3 of a decade :P
 
7:16 PM
@MoreAnonymous The close vote could have also been cast before you edited the question to have more detail
 
user434058
7:39 PM
Do suspensions on PSE cause automatic suspension on Chemistry SE? Just curious... (because that's what I am seeing)
 
@FakeMod It might depend on what the suspension reason was? I don't know enough about suspensions to be sure though
 
@FakeMod No, moderators on one site can only suspend users on their site. SE employees can suspend users network-wide.
 
@FakeMod I don't think there's any mechanism that just bans you on the two sites. Typically it's either a "network wide" suspension, or it's on a per-site basis.
@FakeMod In the interest of being a snoop, you can check through a users network activity and see if there's anything that suggests they might have been banned from another site; like as an example, they might have posted a thread to meta SE asking what's wrong with the chemistry community. This would suggest that they also had problems there and one wasn't automatic because of another.
 
7:55 PM
@FakeMod What ACM said
 
8:46 PM
Hi all; I have a general question
 
@FakeMod No, mods have power only over their own sites. CMs can ban you network-like, and sometimes they do. There are only rumors, why are they banning anybody.
 
For a long time, I have been interested in Relativity and in general, understanding the geometric layout of the Universe; I know that to understand this, I should begin learning Special Relativity
I am currently independently learning Linear Algebra and I believe I have learned a sufficient amount of theory to begin Special Relativity
 
@FakeMod Some people are mods on multiple SE sites. I never heard about that such a mod had punished anybody on other sites where he did the offense. It would be a very serious power misuse for them. As far I know, currently no PSE mod is mod on any other sites.
 
*My question is this: How can I use my knowledge in Linear Algebra to begin understanding Special Relativity? *
 
You could read a book on the topic
 
8:52 PM
I think we have a question with some book recommendations for SR, right?
 
I'm looking online
Please let me know if there is a book/file/videos on the topic
I would greatly appreciate it
 
there are plenty
 
hello
 
I'm working on a project involving how muscles get shorter or longer depending on how they are stretched over time.
 
9:03 PM
9
Q: What are good books for special relativity

Nukul ParmarI read Introduction to special relativity by Robert Resnick. It is a beautiful book as an introduction. I got insights and intuition in special relativity. I want to learn special relativity at a more deeper level. Please recommend some books/ research papers for special relativity?

Apparently it wasn't on our master list
 
I've found an article where the author in question basically comes up with a proposed equation for how a single muscle would change if you stretched it.
But they don't look at the interaction between two muscles.
I want to understand this dynamic.
So I'm envisioning creating a toy model
where I have two springs
each with a spring constant
let me show u
 
People seem to recommend Naber for special relativity apparently
 
Now imagine these two springs have constants $k_1$ and $k_2$
I want to essentially create a phase space that explains how they affect each other
But I'm not sure what literature I would read to learn about how to do that
I know dynamical systems theory is relevant I think
but I don't know specifically what kind of physics book would have a model like this
Any ideas?
 
9:29 PM
if it's not too much trouble, would you mind putting it in the master list? @DavidZ
 
I already did
 
Thanks pal :-)
Would you happen to know if there is any reference to this in the master list? @DavidZ
 
Not directly, of course, but I have no idea if one of the linked questions has an answer that mentions it.
 
10:32 PM
spooky :P
 
11:07 PM
0
Q: Allowing questions regarding typos in books

Sashwat TanayMy question was closed as off-topic because I was trying to be sure whether something was a typo or not. It involved no physics concept. Now, I think physics.stackexchange should be broader in their mindset. The goal should be to promote physics learning overall. This could come in the form of i...

 

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