The h Bar - 2017-08-29 (page 2 of 2)

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Anonymous

3:01 PM

@Sid Input the lines as strings perhaps and then check if they contain the sub-string you desire

Anonymous

125

Q: How to extract a substring from inside a string in Python?

Let's say I have a string 'gfgfdAAA1234ZZZuijjk' and I want to extract just the '1234' part. I only know what will be the few characters directly before AAA, and after ZZZ the part I am interested in 1234. With sed it is possible to do something like this with a string: echo "$STRING" | sed -e...

python string substring

Anonymous

739

Q: Why does comparing strings in Python using either '==' or 'is' sometimes produce a different result?

I've got a Python program where two variables are set to the value 'public'. In a conditional expression I have the comparison var1 is var2 which fails, but if I change it to var1 == var2 it returns True. Now if I open my Python interpreter and do the same "is" comparison, it succeeds. >>> s1 =...

python string comparison

@JohnRennie No. The required lines have to start with X-DSpam-Confidence. And then, they have a number

Again, not all lines need to have the required string. Only some do

@Sid Right, but of the lines that start with X-DSpam-Confidence are they all X-DSpam-Confidence: <number>?

Yeah. Well.... got it

3:05 PM

@Sid got it?

The idea.

I didn't realise that all such lines end with the number.

Then just find lines starting with X-DSpam-Confidence: and slice off the leftmost 20 characters. Then take the next token up to the first space or end of line and and see if it's numeric.

Anonymous

Or other special characters

Anonymous

Just end when it is not numeric

Anonymous

Use ASCII for that

Anonymous

3:08 PM

Seems like a String operation program

@JohnRennie I tied my shoes incorrectly for 14 years and people say I still have a strange technique

@0ßelö7 I'm saying nothing :-)

@ACuriousMind mooooooodules

@0ßelö7 What about them?

@ACuriousMind soooooocles

@ACuriousMind but more seriously, am I supposed to know that a (left) ideal in a unital ring is contained in a maximal (left) ideal?

3:12 PM

@0ßelö7 Yes, that follows directly from the definition of "maximal ideal" (and possibly an invocation of Zorn's lemma)

@ACuriousMind I'm confused what the unit has to do with anything

@0ßelö7 If you don't have a unit you cannot guarantee that the ideal produced by the Zorn argument is not in fact the whole ring.

@ACuriousMind that is what the internet says but since I'm asking that clearly doesn't make sense to me

@0ßelö7 Does it not make sense because you haven't found someone actually pointing out the flaw in the proof in the non-unital case or because you have philosophical issues with Zorn's lemma? :P

Hi all. I'd like to gain more insight into the field of nanomagnetism and its potential uses. I'd appreciate any resource recommendation, comments etc. on the topic. Thanks !

3:21 PM

@ACuriousMind would you believe me that I don't know what an ideal is

Anonymous

@Kirlangic Maybe google can help you more :p

@0ßelö7 No in the literal sense, yes in the sense that you don't have a good intuition for them.

No proper ideal can contain 1 since then r.1=r is in the ideal for each r in the ring

Correct

@ACuriousMind I came here to gloat and you're talking about Zorn's lemma? bejeesus.

3:23 PM

So in the chain you can't have 1s, and the sup doesn't have 1 either. So it can't be the whole thing

@Blue hehe I've already done that. I was hoping to come across someone experienced on the field actually.

@0ßelö7 Exactly, and this construction of the upper bound is what fails in the non-unital case - a union of proper ideals can be the whole ring in that case.

@ACuriousMind agreed

@EmilioPisanty :P

I cannot internalize algebra definitions. I took an algebra class and learned this stuff, then promptly forgot it all

Anonymous

3:25 PM

@Kirlangic Ask a more specific question. You previous question was too broad. BTW I don't know anyone here who is working in that particular field. Yet, they might be able to help you out if you have a specific question.

@0ßelö7 has an easy solution

forget about every algebraic structure that's beyond the holy triad

((vector space, group, field), obviously)

@Blue

@EmilioPisanty I understand those, although cosets still confuse me

I can't get left/right straight

hmmmm. Does anyone here have access to unblocked Elbakyan-net?

I discovered that the magnetism at nanoscale + spintronic devices are considered as the next generation of data storage. I wonder the underlying mechanisms of this concept.

3:29 PM

and if so, can they check whether doi.org/10.1088/1612-2011/13/4/045301 is available there?

the Telegram bot says it doesn't have it

but I swear I've seen the pdf

@EmilioPisanty It's on there.

@ACuriousMind damn

?

DAMN.

@JohnRennie Yes. They started off as purest substanceless (but fun) popcorn, and somewhere along the way developed into real artists. Which just goes to show that you never know.

3:32 PM

@ACuriousMind elbakyan-net is blocked on my institute, so when I needed I tend to ask the telegram bot

but this is the second time that it says it doesn't have it and the web version does

That's...suspicious :P

@ACuriousMind what is?

that I consult elbakyan-net?

No, that the bot would disagree with the web version

@ACuriousMind I was almost hoping it would be "It's Everyday Bro".

=P

@ACuriousMind yeah, it's weird

3:34 PM

DISAPPOINTEED

but why would it be suspicious?

@EmilioPisanty Well, I'd have naively imagined that the bot just passes the request on to the website. This means it does...something else.

@ACuriousMind so, you think it's tracking you and the website doesn't?

@BalarkaSen with the Disney channel flow

@EmilioPisanty Maybe? I don't know, I just can't see a reasonable explanation. Caching? :P

3:36 PM

@ACuriousMind doubtful

slightly different APIs / slightly different DBs?

@ııııııııııııııııııııııı what sort of name is that? :P

Hey @Sci_Hub, does the Telegram bot have a different database than the web? 10.1088/1612-2011/13/4/045301 comes back empty.

Tweeted by monkruffle on August 29, 2017 at 3:36 PM

@0ßelö7 A brand new meme came out today.

(Read the comments below the vid if you watch it)

oh, yeah, that reminds me

@EmilioPisanty All the metonymy and now you post a tweet with the actual name of the site...

ııııııııııııııııııııııı

3:39 PM

@ACuriousMind a placeholder until I came up with something better

@ACuriousMind =P

physics.stackexchange.com/questions/345542/… needs a bounty

ııııııııııııııııııııııı

What does Laughlin mean here by this:

any effort to slow the rate of fossil fuel usage will "leave the end result exactly the same: all the fossil fuel that used to be in the ground is now in the air, and none is left to burn",

aaaaand, it's official, the-rep-I've-given-away would be the 34th user by total rep, three places up from the cut at the end of the first page

@ııııııııııııııııııııııı What is unclear about that quote?

@EmilioPisanty You may be addicted to bounties.

@ACuriousMind possibly?

ııııııııııııııııııııııı

3:42 PM

@EmilioPisanty I was going to set a bounty for it but I thought maybe I should first think harder about it myself....

I couldn't realistically admit to that, could I

@EmilioPisanty Why not? Addicts can be well-aware they are addicted :P

ııııııııııııııııııııııı

@ACuriousMind that he claims "No fossil fuel is left to burn"

obviously, fossil fuels are used a lot today

@ııııııııııııııııııııııı If you eat half as fast but wait twice as long, you'll still finish the plate

@ııııııııııııııııııııııı There is a finite amount of fossil fuel available, so unless we stop consuming it completely, we'll reach the point where none is left sooner or later

3:45 PM

So why not eat twice as fast and wait half as long

yolo

@EmilioPisanty ::boggles:: I'm impressed.

@BalarkaSen Laughlin is talking about the 'end result', i.e. wait for as long as necessary

Tell the truth I have mostly been disappointed in what my bounties have brought.

@dmckee ::grin:: that's the effect I was angling for ;-)

@ACuriousMind unless you set your yearly consumption to one third of the remaining fuel

in which case the claim is only asymptotically true

@EmilioPisanty Ah, Zeno's gas station :P

2

3:50 PM

That's how topping off the gas tank works

I need to revise how zeno paradox is resolved by derivatives

@0ßelö7 I'm pretty sure I've managed to leave gas stations in finite time

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@EmilioPisanty this claim is flawed then. for one, it's not logical to assume we can't stop using fossil fuel before the resources are completely used up (he probably has no idea how much is remaining)

0

Q: What to do when no one answers your question

Yes i know that one answer is to wait. But if you want answer urgently then what to do? What are alternatives?

but then again I've yet to go to a self-service gas station, so maybe the attendants have been using some Zeno magic I'm unaware of the whole time.

@ııııııııııııııııııııııı I don't think a context-independent evaluation of that quote is possible.

@PhysicsMeta you're a bit behind the times, no?

3:56 PM

@EmilioPisanty do you know what I mean by topping off?

@0ßelö7 yes

unless you mean a process that takes infinite time

ııııııııııııııııııııııı

@EmilioPisanty we can stop using fossil fuels before the reservoirs are depleted. Whether this has any effect on the climate change already caused by the extra released CO2 is another question

@ııııııııııııııııııııııı I don't understand. You asked for the specific meaning of the quote and I tried to clarify it. Are you now trying to engage in a discussion of the merits of a single sentence that's potentially been yanked out of context?

ııııııııııııııııııııııı

@EmilioPisanty No I just said my opinion about it :)

@ııııııııııııııııııııııı For clarity, you're commenting on just the sentence, and not the entire American Scholar piece?

ııııııııııııııııııııııı

4:01 PM

Is this a legitimate question for the site: What is Lubos Motl's opinion on global warming and the effects of the fossil fuels usage on it?

@EmilioPisanty Yeah just the sentence

Anonymous

@ııııııııııııııııııııııı Is that a joke ? ;p

ııııııııııııııııııııııı

@Blue no. what made you think it may be a joke?

Why would a question about what Motl thinks be on topic here?

Anonymous

Opinion based questions are usually not entertained on the main site.

Anonymous

Better ask that on Quora XD

ııııııııııııııııııııııı

4:04 PM

@JohnRennie Because he is known as a climate (mis)informer on the Internet

@ııııııııııııııııııııııı But that has nothing to do with physics.SE. Asking what opinion a particular person holds is not a physics question.

@ııııııııııııııııııııııı ¯\ _(ツ)_/¯ to each their own

@ııııııııııııııııııııııı that's a question for google, no?

Anonymous

@ııııııııııııııııııııııı facebook.com/lubos.motl Perhaps this is his FB profile

Anonymous

I'm not sure ;p

Anonymous

Ask him there

4:06 PM

climate change site:motls.blogspot.com, with about 3000 results

@ııııııııııııııııııııııı yes, but this is a site for questions about physics not questions about Motl.

@Blue There is no need to ask him, his blog has plenty of posts on the subjects which make his opinion perfectly clear :P

ııııııııııııııııııııııı

@JohnRennie Assuming he is a physicist and his claims are based on scientific reasoning, that question would be a physics question

@JohnRennie where should I stick c=G=1?

@0ßelö7 that will confuse the bejesus out of the average STEM student.

Assuming any are still conscious at that stage

4:11 PM

@JohnRennie so I had to use a constant of order 10^-18 to see effects. 34 orders greater than reality

I have mathematically proved my project is irrelevant to the real world lmao

2

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@0ßelö7 As long as it helps you get your degree, it isn't.

So Gmail changed to mail.google.com

Could I ask a surprisingly mundane question

Do you ever wonder if youtube will become videos.google.com?

Idk why I'm getting so confused trying to solve it,

it's basic maths

$Sec(x) - tan(x) = \frac{1}{2}$

4:15 PM

@Phase what about it?

Well, I can't find x despite it being basic maths, and it's driving me up the wall

Anonymous

Heh. Use the identity $\sec^2(x)-\tan^2(x)=1$

@Phase wolframalpha.com/input/?i=sec(x)-tan(x)%3D1%2F2

I thought about using that but

claims $x=2 (n \pi + \tan^{-1}(1/3))$

4:17 PM

If I go about squaring sides, won't I end up with more solutions?

Anonymous

$(s-t)(s+t)=1$

Anonymous

You know $s-t=1/2$

@EmilioPisanty I care more about the method because it's destroying all self respect I have not being able to find it

Anonymous

Then $s+t=2$

Anonymous

Add them up

Anonymous

4:18 PM

$2s=2+1/2=5/2$

Anonymous

And $2t=2-1/2=3/2$

@Slereah paracompqctness and second count ability are equivalent btw

For locally Euclidean spaces anyway

Anonymous

I think you can take it from there?

Anonymous

@Phase

Huh

I didnt even see that

thanks blue

Anonymous

4:20 PM

No prob

in Mathematics, 7 mins ago, by Faust7

Why are homomorphisms useful?

(physics perspective needed)

Link that needs to be copied into ever so many questions on the site:

What if what *I* see as blue, *you* see as a slightly different blue because you're using Chrome instead of Firefox and despite a decade of messing with profiles we STILL can't get this right somehow.

Color is pretty

Dammit! I catch up on XKCD and SMBC on a Saturday afternoon but people keep posting their latest cartoons here!!!

Reading Saturday Morning Breakfast Cereal on a Saturday afternoon

4:26 PM

Also let's turn the question around a bit:

> What is the minimal necessary and sufficient condition to uniquely define the concept of color?

@dmckee so... the whole dress fiasco was just down to browser colour rendering profiles?

Ban @Emilio pls

Bringing up such a traumatising point in human history

@Phase hey

I was a double outcast during that episode

Made that year pretty much agony. It was in conversation for such a needlessly long time

What

what did you see it as?

plato.stanford.edu/entries/color

4:28 PM

blue and gold

still do

blue and dark brown

@EmilioPisanty It comes down to "Your brain is continuously and egregiously lying to you about what your eyeballs have actually detected".

Life makes much more sense after you figure that out.

@dmckee =P

@dmckee it does

What we see is technically hallucinations by our brain

our brain made up part of the world we see

and then update that fiction in a bayesian fashion

I actually love the breadth and variety of optical illusions that humans are subject to.

4:32 PM

@Phase even jokingly calling to ban someone can get a little touchy sometimes, so you might want to be careful about that in the future

It is just astounding how much our brains paper over with educated guesses.

And I think about other animals with sophisticated vision and wonder if they are subject to the same kinds of trickery.

I assume the answer is yes for the mammals because evolution. But what about, say, octopuses?

cc @DanielSank

well, if they are not, their brains have to do real time computation very very fast, and how much food will be able to sustain that

That's a evolutionary line that diverged from our long ago.

@0ßelö7 Is that the case if it's not Hausdorff?

@Slereah probably

4:38 PM

actually, if our brain is not a quantum computer (and assuming that our consciousness is entirely physical) then what kind of machine is our brain?

I won't guarantee it though. You're too tricky

Anonymous

Is it fine to apply the rule $\vec{A}\times(\vec{B} \times \vec{C})=\vec{B}(\vec{A}.\vec{C})-\vec{C}(\vec{A}.\vec{B})$ to $\vec{\nabla} \times (\vec{f} \times \vec{g})$ ? Our prof was saying that would give wrong results as $\vec{\nabla}$ is an operator and not a real vector, but I don't think so.

I rather disagree with his conclusions (which are unclear until the very, very end of the piece), but Laughlin's piece on geological time and climate change, which Mostafa partially quoted earlier, is a nice exploration of geological time

user image

@Blue Your prof is, as usual, correct.

2

Anonymous

Gosh.

4:41 PM

I know why are you wrong but I'm currently in full deadline panic

I'm only here for witty comments and thought-provoking images

Hi @MetaEd. Did somebody flag something? Or what brings you to these parts?

Some hints: $\nabla$ is an operator, thus unlike usual vectors, it only acts to whatever is on its right. It is possible to recover some kind of "product rule" by using feymann subscript notation, and then expand the result into those 4 terms you saw, but all vector calculus identities are best proven using indices

@Blue Be careful about doing vector algebra with operators, mostly because things don't commute.

@EmilioPisanty I wander about aimlessly.

Anonymous

@Secret I don't know what indices are ;_;

Anonymous

4:44 PM

Thanks though

@Blue what

Profs are always correct. They simply don't tell you the whole thing because you might not grasp everything- Said no one ever.

how can you be a physicist and not know what indices are

Anonymous

@Sid "always"....heh

@Sid Even when they are wrong, they are just testing you.

Anonymous

4:45 PM

That's such a lie

@Blue does the expression $\vec A \times \vec B = \sum_{ijk} \hat{e}_i \epsilon_{ijk} A_j B_k$ make sense to you?

Anonymous

I proved my comp professor wrong three times in the last one week

@0ßelö7 Yep.

@Blue professors love that

Prathyush Poduval

@Blue Good luck with your practicals then :P

4:46 PM

@Blue be careful

Prathyush Poduval

If he is the kind to take it in the bad way

Anonymous

@EmilioPisanty No.... I need to learn indices I think. Perhaps I should try out with some examples

Anonymous

@BalarkaSen will teach me probably :)

Professors are human beings. They can be wrong. A good proportion is usually not.

@Blue example?

4:46 PM

@BalarkaSen hates indices

I don't know index shit. Don't ask me that stuff.

I'm (no joke) the best person for that

^

but you are busy for today

@Blue I would advise you to make sure you understand the expression I just posted, completely, before tackling the differential-operator version of the identity

4:47 PM

@Secret indeed

Anonymous

@Sid He said strlen in C returns number of characters including the null character

@Secret fighting with Matlab right now

Prathyush Poduval

@Blue It's quite simple, just google Levi-Cevita tensor (Quite helpful in proving vector identities)

Reminds of 3 weeks ago, I wrote that crazy script that allow me to do 13400 calculations

now, I have done 6 out of the 40 batches of calculations

@Secret Oh I'm just trying to get it to plot something in a coherent way

Anonymous

4:48 PM

@PrathyushPoduval I knew it but I forgot...I'll check it out

my calculations are fine, maybe

Prathyush Poduval

@Blue check this out physics.usu.edu/Wheeler/ClassicalMechanics/…

@Blue I dunno C. But strlen sounds like the length of a string.

Anonymous

@Sid Yes. But it doesn't include the null character

Anonymous

At the end of the char array

Anonymous

4:49 PM

There is no explicit String type in C

[Time travel world building stuff] Meanwhile, pondering about a GR scenario where there is nonlocal sudden change in energy across a worldline (details later)

@Blue just read Zee's GR book

it's written at your level

@Blue If you add a null terminator at the end, it won't count, yes.

assuming Balarka has been diligently teaching you linear algebra

Prathyush Poduval

@0ßelö7 I don't recall seeing programming in it

4:50 PM

@PrathyushPoduval I'm not talking about programming

anyway, I am off for tonight

Anonymous

@0ßelö7 Sure. I plan to take up GR after getting through with basic QM

Prathyush Poduval

@0ßelö7 Oh sorry, I though you were referring to his previous message

@Blue if you want to learn indices you need to do it through GR

@Blue Did your prof show you an output to a program he wrote to show that it counts null character?

4:52 PM

4

A: On the uniqueness of the Riemann-Christoffel tensor

Note that we're working in a normal coordinate system, so your equation for the second derivative of the metric simplifies to $$\tag{$1$}\frac{\partial^2 g_{\mu\nu}}{\partial x^\xi \partial x^\rho}=\frac{\partial\Gamma^\sigma{}_{\mu\rho}}{\partial x^\xi}g_{\sigma\nu}+\frac{\partial\Gamma^\sigma{}...

Anonymous

@Sid No. He was giving some examples

@Blue your goal is to understand this

Prathyush Poduval

How did you have the patience to type it out??

@PrathyushPoduval it didn't take very long

@Blue Well... examples also count as programs if they are codes.

Prathyush Poduval

4:54 PM

The continous partial derivatives look s very painful to type :P

Anonymous

@Sid He was giving examples of codes

@PrathyushPoduval copy + paste

Prathyush Poduval

Copy paste might have helped i guess?

then type in the indices

@0ßelö7 still looks painful to type

4:55 PM

@EmilioPisanty I had most of it in personal notes from high school

@Blue and if the codes gave him the output, how was he wrong?

@0ßelö7 you had that $\partial$ soup in notes from high-school?

Oh, wait. Did he count the \n character and said that it counts the null character?

@EmilioPisanty I went to a boring high school

@0ßelö7 High schools are always boring

Anonymous

4:57 PM

@Sid Wut?

Anonymous

He was writing on the blackboard

Oh...duh

Sorry, I misunderstood

Anonymous

Well, that's why I don't blindly believe people :P :)

@EmilioPisanty Oh, they weren't teaching that

I just hated chemistry so I learned GR

@Blue Did you stand up and fight with him?

Verbally? :P

4:59 PM

seemed like a pretty reasonable thing at the time, I'm sure everyone thought I was insane though

Anonymous

@Sid Nah...I downloaded a C compiler on my mobile and ran the code on it. Then I executed the code in front of him. He isn't one of those rude profs though. He corrected his mistake. :)

Now that's a good prof.

Hey, mind if I jump in with a quick question?

I've only had one terrible prof and @rob knows who it is

@Giskard42 just ask!

5:04 PM

I've got a beam of sound, roughly 30 degrees wide.

I'm trying to make a "lense", to try to get that down to about 10 degrees.

I've been playing around with wave simulators to try and get a shape that'll do some interference magic and focus the beam

But I'm not sure if what I'm trying to do is even possible

If the sound comes from a point source (at the point where the 30º rays converge if you trace them back) then you want a convex lens with the point source closer to the lens that the focal length. I think ...

This is my source:

Well that would be the case for light. I'm assuming acoustic lenses work in the same way.

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@JohnRennie I guess the thing that's doing my head in is... what does a convex lens even look like for sound?

Anonymous

Acoustic mirror

An acoustic mirror is a passive device used to reflect and perhaps to focus (concentrate) sound waves. Parabolic acoustic mirrors are widely used in parabolic microphones to pick up sound from great distances, employed in surveillance and reporting of outdoor sporting events. Pairs of large parabolic acoustic mirrors which function as "whisper galleries" are displayed in science museums to demonstrate sound focusing. Between the World Wars, before the invention of radar, parabolic sound mirrors were used experimentally as early-warning devices by military air defence forces to detect incoming enemy...

Anonymous

5:15 PM

nature.com/scientificamerican/journal/v302/n6/full/…

Anonymous

Ah, this is really interesting

Anonymous

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Anonymous

@Giskard42 I guess it could be made by an arrangement of metal reflectors. I'm not sure though. There might be better designs.

@Blue Duuude, that lens is exactly what I'm looking for - if I can find the original paper that might be doable.

Anonymous

Yeah, the Nature paper is good

Anonymous

5:18 PM

But making that design might be difficult in reality

Anonymous

Good luck

@Blue "Making that design might be difficult in reality" Story of my gorram life :>

Anonymous

What's the hurry? Take your time

Dang reality, always getting in the way of elegant engineering solutions

Anonymous

androidauthority.com/youtube-new-logo-796482

Anonymous

5:26 PM

The new logo seems so orangish

@JohnRennie it's döne

can I email it to you?

ııııııııııııııııııııııı

6:13 PM

If some had posted an answer with a formatting like this, I'd have flagged it immediately:

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6:24 PM

-_-

7:07 PM

@Blue @JohnRennie ...Um... turns out the answer is a lot simpler than 3d clusters of spheres - I set up a highly professional test jig (comprising of a transducer mounted to a selfie stick on a tripod), and I have determined the best lense is.....

a tube.

Cuts the side-lobes down to 5 degrees.

7:45 PM

@ACuriousMind I need a yes/no because I have to print this thing eventually. Do you want to read my poster and give comments?

8:08 PM

Like a desert in here

8:30 PM

@Avantgarde plays MLG sad violin

socle

@BalarkaSen what are some examples of socles

i have no idea

you should go to the math room and ask Tobias Kildetoft

he's the algebra expert

@BalarkaSen do you know what I mean?

I have heard of socles but I have no idea what that stuff is

In fact the person I heard of them from is Tobias K

@BalarkaSen I showed the textbook to my prof and he said he'd never heard of any of it

I guess finite rep theory is pretty niche

@BalarkaSen what is your opinion of Wildberger?

8:42 PM

I miss Mafia...

so in the stress-energy tensor I get that $T_{00} = \gamma^2c^2\rho_0$ but how does that equal $\rho c^2$?

I might be being stupid but wouldn't it be $\rho = \gamma\rho_0$? not $\gamma^2$

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@SirCumference What Mafia?

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how is the red rhombus the primitive cell of a honeycomb lattice in the above figure?

ııııııııııııııııııııııı

9:13 PM

never mind.
It's clear

9:25 PM

@0ßelö7 Yes, but only if it can wait till next week.

@ACuriousMind 15 minutes

Too late, I submitted it.

10:12 PM

@ııııııııııııııııııııııı reference?

that's a nice photonic graphene

does it have a linear transverse dispersion?

and if so, does it have a slow-speed-of-light property?

10:25 PM

@EmilioPisanty how slow?

10:57 PM

@0ßelö7 well, that'd depend on the bandgap, wouldn't it?

@EmilioPisanty what's an impressive slowdown?

@ııııııııııııııııııııııı MAFIA3500

11:33 PM

Perhaps, he's still around using a different name.

:P

Rumplestillskin

Guys what are your thoughts on using the term "non-gravitational forces" in GR? I am particularly interested in near-Earth satellites. Is the "non-gravitational" redundant?

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