The h Bar - 2017-08-01 (page 1 of 3)

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1:00 AM

@DawoodibnKareem I am 10 years old.

@ACuriousMind the cat hates me

Dawood ibn Kareem

1:15 AM

@0celóñe7 I am the Queen of Sheba.

1:28 AM

@DawoodibnKareem Impressive.

But the answer to your question is that I'm not 7 because I'm 10.

1:40 AM

It's all relative. 0celo is using base 19

@SirCumference thinks

what?

Dawood ibn Kareem

2:04 AM

@SirCumference or maybe he uses base ten, but he lives on Mars.

@DawoodibnKareem ...wha?

@0celóñe7 Base means how many unique numbers we use when counting, until we start repeating them. Like in base 10 (our everyday one), we go from 0-9, then repeat as 10-19, 20-29, etc. In base 19, for example, you'd keep counting after 9 (using new letters or symbols to mean each number) and what we usually call "19" would be represented as "10"

In binary (base 2), what we'd normally call "2" is represented as "10", etc.

never heard of that

@0celóñe7 It's sorta obscure in math but becomes important in computer science, when different bases can be more useful (often, programmers use binary or base-8)

I program and I've never heard of this

Hexidecimal is base 16, for example. Decimal is our everyday base 10. The ancient babylonians used base 60

@0celóñe7 Generally it's more used when dealing with how a computer interprets code

In mathematical numeral systems, the radix or base is the number of unique digits, including zero, used to represent numbers in a positional numeral system. For example, for the decimal system (the most common system in use today) the radix is ten, because it uses the ten digits from 0 through 9. In any standard positional numeral system, a number is conventionally written as (x)y with x as the string of digits and y as its base, although for base ten the subscript is usually assumed (and omitted, together with the pair of parentheses), as it is the most common way to express value. For example...

Dawood ibn Kareem

2:43 AM

@SirCumference I believe he knows all this. This is part of his "I'm 10 years old" gag.

1 hour later…

4:07 AM

Food for thought:

895

Q: Question quality is dropping on Stack Overflow

I'm seeing a rapid trend towards worse and worse question quality. It gets to the point where I'm asking myself "Why did I even help this guy? He neither has the will nor the capacity to understand the answer; I have just been wasting my time". That happens more and more often lately and is prett...

discussion questions

Dawood ibn Kareem

@DavidZ It always has been!

On a bright note - I just persuaded someone to remove the sentence "Dawood's answer is not right" from the top of his/her own answer.

Excellent :-)

Dawood ibn Kareem

I think that as all the stack exchange sites grow in popularity, it's inevitable that question quality will drop. It's no longer just the crème de la crème of programmers/physicists/whoever who use these sites.

1 hour later…

5:22 AM

@DawoodibnKareem US law forbids the keeping of personal data on anyone under 13, hence the age limit on SE and indeed most sites since the info you provide when you register is considered personal data.

If someone is genuinely interested in physics and willing to work at it then I welcome their questions and I don't care how old they are.

@SirCumference it does happen but it's rare. The cynic in me suggests it happens when that person brings lots of industry funding with them :-)

Dawood ibn Kareem

@JohnRennie I understand. But I think people relate differently to children from how they do to adults.

I can be quite critical of other people's answers, especially on Stack Overflow, where so many people write such complete garbage in their answers. I would hope that anyone posting an answer has the maturity to be able to take constructive criticism on board. I wouldn't necessarily expect that from a child.

Stack Overflow has it's own culture. On the PSE we generally like people to be at least polite if they can't find it within themselves to be kind. The big difference is that we're here to try and learn, not to justify our pay cheques.

Dawood ibn Kareem

5:41 AM

My feeling is that if someone posts an answer that's incorrect, it's unkind to the querent not to point it out. Often, people believe the answers they get when they post a question. Whether I'm impolite when I do so is, of course, a matter of opinion; but I would probably be more careful if I were considering the possibility that the respondent is very young.

I agree, and I do point out misleading answers where I see them. But I try to always do this without hurting the feelings of the person who posted the answer. I would do that whether the OP is a ten year old or a tenured professor.

Dawood ibn Kareem

I am looking over my comments on this site. I don't think I've said anything that would upset anyone. But you have me a wee bit worried.

The rudest I get is probably right at the bottom of this answer

@DawoodibnKareem that doesn't seem rude to me. Anyway Valev is a well known anti-GR nutcase and utterly immune to any form of criticism :-)

Dawood ibn Kareem

5:57 AM

Ah, yes, but I didn't know that. He/she could easily have been a seven year old.

The problem here is that answers can be right or wrong, and you won't know unless somebody tells you so. Unlike Stack Overflow, where someone can give you an answer, you try it out, and it just plain doesn't work.

That's why I commented on the accepted answer to this question, which was basically wrong; then eventually posted my own answer.

I think both comments are fine because both are constructive. You're worrying too much :-)

Dawood ibn Kareem

OK, thanks for the guidance.

6:11 AM

Hi, everybody

Dawood ibn Kareem

Hi Daniel.

3 hours later…

8:53 AM

Hey guys, is anyone here free to help me with a question?

@lzy Hi. I wondered if you'd ask here. Yes, I'm happy to help :-)

You just need to redraw the right hand part of your circuit. Sall I have a go at redrawing it?

Thanks! I'm not sure how I could send the picture, but could I post the link here?

Basically my biggest question is: which nodes in the circuit have the same voltage drop?

I think you need a certain rep score to be able to upload pictures, but it's OK because I can see the picture you posted in your question.

Give me a moment and I'll redraw the circuit.

Thankyou!

user image

@lzy OK, I've redrawn the circuit to make it a bit clearer what's going on. Can you see how I've redrawn the circuit? Does it make sense?

9:06 AM

Ah I see, that looks a lot better. So the voltage drop across BF is the same as the drop across the entire combination on the right? and the drop across R5 is the same as R7 and R6?

R7 and R6 combined I meant

Correct! :-)

The ammeter is measuring the current through R6 and R7

You can with some effort calculate the current through R5, then the current through R4 is the sum of the R5 and the R6/R7 currents.

And that gives you the B-F/G voltage

Actually doing the calculation is going to be a bit of a pain, but these homework questions are often made deliberately complicated.

Alright I'm trying to get my head around this whole concept. So (from the original diagram): after current leaves F, it goes to G, then splits, and all goes back through R4, then goes back to the battery? Could I do this question without re-drawing the circuit? I get the re-drawn circuit but i find it a bit hard to do!

Redrawing the circuit doesn't change anything of course, it just makes it easier to understand what is going on. You'll often find circuit problems are deliberately drawn in a way that makes them hard to understand.

I strongly recommend redrawing the circuit because under exam pressure you need all the help you can get. But it is possible to do the problem without redrawing the circuit. You just have to be really careful about tracing the flow of current.

9:28 AM

Yep, thanks for the advice

Also, is the voltage drop from G to H to D to C the same as from F to G to C to B?

If "voltage drop across branches are the same"

No.

Suppose the current in the right hand branch (as I've drawn it) is I. Then the voltage drop BC is just the drop across R4 so it's just V = IR4.

The voltage drop CG is the same current I multiplied by the combined resistance of R5, R6 and R7.

And this won't be the same as the drop across R4 - well, not unless the combined resistance of R5, R6 and R7 turns out to be equal to R4, but that isn't likely.

9:53 AM

Ahhh ok ok I think I can see it clearly now. Sorry I was taking my time to comprehend all this haha as I understood it wrong before.

Have my exam tomorrow and I'm just trying to find hard questions to do to challenge myself.

@lzy Good luck! :-)

Do you know any websites or anything that has these complex circuit questions and also wheatstone bridge circuit questions?

I don't I'm afraid. You could try asking in a few hours when hopefully there will be more people in the chat room.

That's okay:) Do you mind if I ask you a few more questions later on if I need a little assistance again? You're very good at explaining! :)

You're always welcome to ask in this chat room. I'm not always around, but if I'm around and see your question I'll help if I can.

Other people will help too of course, it's just that right now it's rather quiet in here :-)

10:00 AM

Thankyou!

10:12 AM

Hey @JohnRennie , was wondering for this question (Q2): indiabix.com/electronics/series-parallel-circuits/… Is it correct if I say that the voltage drop from R1 to R2 = voltage drop from R3 to R4 = voltage drop from R4 + R5 +R6?

10:48 AM

@lzy redraw it like this:

user image

11:01 AM

Good mornings kids

Good afternoon @0celóñe7

Or may be good evening

11:20 AM

[Random]

user image

user image

11:37 AM

@JohnRennie Therefore the R1+R2 drop = the R1 +R3 +R4 drop = R1 + R3 + R5 +R6 drop?

And the R2 drop = R3 +R4 +R5+R6 drop?

user image

@lzy in the interests of being clear I'd put it differently.

I'd say Vab = Vac + Vcb = Vac + Vcd + Vdb

But assuming I understand you correctly we are saying the same thing

11:59 AM

You are indeed saying the same thing

Thanks for helping!

@JohnRennie Huh. I heard it was the optimal path to becoming a tenured professor, as you wouldn't have to deal with the trouble of being an assistant prof

@JohnRennie I just want to sleep until my SSD shows up

12:29 PM

Where is everyone today?

@0celóñe7 I'm not here

::Jim is sure they'll believe that::

12:43 PM

...just testing MathJax... $\partial_\mu F^{\mu\nu}=0$

yay! It works...

user228700

@JohnR: Moved in at last.

@Kaumudi.H Aha!

Have your family left?

user228700

Yes, they did.

user228700

...and I'm swimming in a veritable pool of tears.

@PhilipCherian at least use coordinate free if you want to show off

12:46 PM

@Kaumudi.H It's an emotional business ... I'd guess this is your first long time away from your family.

@0celóñe7 What's coordinate free?

It wasn't emotional for my family. Are we broken?

@PhilipCherian what it says on the tin

user228700

@JohnRennie It is, yes. I'm extremely close to mum.

@Kaumudi.H there isn't an easy way to do it. You just have to go with the flow for now.

user228700

Yep. Me being me, I'm also extremely anxious about classes starting tomorrow.

12:49 PM

@0celóñe7 Don't really know what that means...

@Kaumudi.H again, that proves only that you're entirely normal - not that we doubted it for a minute :-)

So, you are saying I'm abnormal?

@PhilipCherian when you write the tensor $\mathbf F$ as $F^{\mu\nu}$ you're making the indices explicit. Physicists tend to like that because they end up having to manipulate the indices anyway. Mathematicians tend to avoid writing the indices.

@JohnRennie please avoid stereotyping...we use indices often

@JohnRennie Heh oh! Right! Sheesh, I'm slow. I thought it was something to do with ChatJax :P

user228700

12:53 PM

@JohnRennie :-) Lol.

@Kaumudi.H Don't worry. When you make new friends, you won't feel as homesick.

@Kaumudi.H my memories of how to deal with the stress of starting at college are unreliable because it was so long ago and you tend to forget the scary bits. So I'm not sure how much my advice is worth.

But for what it's worth I think when lectures start the work just sweeps you away and you tend to stop worrying about anything except the work.

user228700

@JohnRennie Hmm, right, OK...

user228700

@SirCumference :-) Thank you. What was the experience like for you?

@Kaumudi.H In my experience the best way is to come in excited to learn. Essentially all of your classes will be more in depth than in high school, and you'll be taught be actual experts in the field

12:56 PM

@Kaumudi.H There's that hmm = you're talking b******s again :-)

That's an incredible experience in itself

user228700

@JohnRennie :-) No, no, it's just that I'm a bit of a wreck at the moment to believe you completely.

user228700

@SirCumference Right, of course. That's nice :-)

@Kaumudi.H I was pretty homesick at first, but it wore off when I made great friends and kept in touch with my family through my phone. Since then it's felt kind of like home here, as cheesy as it sounds >_>

Dawood ibn Kareem

I did something frightfully embarrassing on my first day of university. At least I think it was my first day - it could have been the second or third. The seats in the lecture theatre had a kind of tubular metal framework, and I found myself absent-mindedly stroking the frame of my seat - just kind of running the metal between my thumb and finger.

12:59 PM

@Kaumudi.H There will be lots of young ladies¹, currently in their ~~cells~~ rooms at the YWCA feeling tearful. You're not alone.

¹ I use the word ladies advisedly

Dawood ibn Kareem

Or at least that's what I thought I was doing, until the tubular frame suddenly disappeared from between my thumb and finger. I looked down and saw that the thing I'd been stroking was actually the big toe of the woman who was sitting behind me.

@DawoodibnKareem oh my goodness, that's one of those moments you want the Earth to swallow you up :-)

Dawood ibn Kareem

To make it worse (or probably better, looking back), I was actually in the wrong lecture theatre. It wasn't even my class.

@JohnRennie Banannas?

:-)

user228700

1:01 PM

@DawoodibnKareem Oh my! Wow!

@JohnRennie if not that, I have actually no idea what you meant

Dawood ibn Kareem

So, @Kaumudi.H, my advice to you for your first day of classes is ... don't caress the furniture!

3

user228700

Thanks @DawoodibnKareem: For sharing said embarrassing moment for it made me chuckle! :-)

@JohnRennie Ok, what do I have to do to get Windows on my new drive? Just unregister the old copy and put the code in the new one?

user228700

@SirCumference Wow, that's awesome! :-) I hope I will get to that stage at some point.

1:04 PM

Will that kill the old drive or will I have a few hours/days to get everything moved over?

My advice is not to make your goal to get perfect grades. Instead, focus on understanding the material as best as possible. If you do so, you'll enjoy the subject, find it much easier to get an A in, and come out prepared for your next class

user228700

At least The h Bar will look and feel the very same even if I browse it from my room here at the hostel.

@SirCumference That doesn't really make sense, how can you understand the material better and not get better grades?

@0celóñe7 actually I'm not sure. I've always just reinstalled then re-entered the key. The trouble is you might need to phone MS if the key has been used too many times.

If you understand the material as best as possible I assume you'd get the best grades.

1:05 PM

Can you unregister your Windows installation? I didn't think you could.

@0celóñe7 Of course focus on getting great grades. But you shouldn't worry about "knowing this information for the test". You'll forget what you don't understand once the course is over, if you only focus on the grades

It might get you an A to memorize everything, but it will be much more difficult and far less useful

Ah, apparently you can. Well, you live and learn.

So what, get a B by refusing to memorize random things?

@0celóñe7 That's not what I said. If you focus on understanding things instead and spend enough time, the A will be much easier to get

@ACuriousMind where u at

1:08 PM

Your end goal should be understanding the material

@SirCumference I disagree. 75% (probably a conservative estimate) of what you learn in college is completely useless once you're out. There is literally no reason to know it besides getting good grades.

@0celóñe7 I should've been more clear. I'm talking about classes related to one's major

@0celóñe7 you might want to try transferring your installation to the new disk. Then when you swap the disks everything should just work.

You keep changing the parameters!

@0celóñe7 I'm out of it, it's the morning...

1:10 PM

A quick search suggests this is possible though I've never done it.

@JohnRennie I'm going to back up several folders

Documents, Pictures, etc.

My Skyrim folders :)

Regardless, make sure you understand the material @Kaumudi.H. Spending the time to do so will help you both short term and long term

If my mods break I will die

Simply memorizing what will be on the test won't help much

Also I think I never deleted zips and whatnot, so my Downloads folder should have all of my programs

1:12 PM

@0celóñe7 If you do the disk transfer then after the disk swap you can connect the old disk as a second drive and copy anything you need off it.

@JohnRennie I want to have a safeguard in case the HDD goes up in flames

Damn, why can't the UPS man come to my house first

@0celóñe7 Makes sense.

@JohnRennie Worst case scenario the disk transfer fails for some reason and both hard drives have to be formatted

So I take it Moe has a dim view of human vision and consequently of photometry in general? (har, har, see what I did there?) — Emilio Pisanty 23 secs ago

man, I kill me sometimes

@EmilioPisanty you should go see a doctor about that

going home is crazy, the amount of food these people have is insane

so much food it's like there's no food

@JohnRennie let's seee

@JohnRennie Should I try backup-utility.com/clone/… ?

I can delete stuff off of the large HDD to get it down to 500GB.

Read: delete all games

1:16 PM

By the way, anyone here interested in last-minute registration to this conference?

The Tuesday morning session looks pretty killer

@0celóñe7 worth a try ...

@JohnRennie But again, a backup seems sensible, right?

@0celóñe7 Yes

I'm wondering if the backup built into Windows 10 can do this sort of thing. Since I have some spare time this afternoon I might give it a try ...

user228700

@JohnRennie :-) Haha, that's certainly true!

I wonder if there are marketing people for math/physics

@JohnRennie Hmm

I might have a 500GB USB 3 drive around here

user228700

1:21 PM

I don't feel like socialising though so I am going to stay holed up here for the time being. I'm starting to realise that I relate to @Balarka in the way that he's the underground man :-P

Would still take hours but the UPS guy doesn't get here until 2

@Kaumudi.H when do you get to sample the YWCA food?

Now, "around here" is pretty vague

particle physics --> high energy physics

materials science --> solid state physics

@0celóñe7 Considering the cover of most physics books, I don't think so

fourier analysis on groups --> abstract harmonic analysis

user228700

1:23 PM

@JohnRennie Tonight! At 8 :-) Say, I have a quick question: now that I'll have classes in the morning, around what time will you be around in the evening?

You have to wait until 8 for food?

user228700

@0celóñe7 For my dinner, yep.

Literally insane

@Kaumudi.H evening in British or Indian time?

Ay my school they had unlimited food from 0700 to 2030

user228700

1:24 PM

@JohnRennie Indian time, if u can! :-)

Well I tend to pack it in about 18:30 British time, and I think you're 4:30 ahead so that's 23:00 your time.

user228700

@JohnRennie Right, but will u be around if I ping you?

@0celóñe7 It's a good job mine didn't. I'd (a) never get any work done and (b) weight 30 stone :-)

@JohnRennie I actually lost weight

I gained it back when I started making food for myself again

Not sure what I'm doing wrong, I basically ate pizza everyday when I was losing weight

@Kaumudi.H yes, I'm usually hanging around the chat room from after lunch until I quit for the day. That would be about the time you're doing the set work, assuming you do it after dinner.

1:28 PM

@JohnRennie Yes, there was unlimited pizza and donuts and cookies

Dawood ibn Kareem

@Kaumudi.H If John's not here, I promise to do my very best John Rennie impression.

@0celóñe7 I'd think I had died and gone to heaven :-)

Dawood ibn Kareem

Actually, no, second thoughts I'll probably be in bed.

@Slereah @EmilioPisanty How does one make a notation section on a LaTeX document?

user228700

@DawoodibnKareem Haha :-)

user228700

1:30 PM

@JohnRennie Right, wokay. No, no, I didn't mean to ask when you'd be around for me to ask questions or anything. Ya know, saying Hi etc. :-)

user228700

@DawoodibnKareem Ah :-)

Dawood ibn Kareem

However, if I do happen to be awake, you are welcome to either say hi to me, or ask me physics questions.

Or both.

@Kaumudi.H I tend to be out hunting lunch from around 13:30 to 15:30 UK time. When I'm in I generally have the computer on and the chat room open on a tab so I should hear the notification sound.

@0celóñe7 \usepackage{nomencl}

Dawood ibn Kareem

Jul 27 at 7:12, by John Rennie

For the record I don't own an axe or a shotgun.

How do you hunt your lunch?

1:33 PM

@DawoodibnKareem A machete, like a real man.

I have a lethal credit card :-)

@JohnRennie Waits patiently in tree tops, covered in cat piss and whatnot to mask his manly musk. When a deer, etc., comes by he drops down and stabs it in the spine with his trusty Swiss Army knife.

I like venison

Dawood ibn Kareem

@0celóñe7 I thought all he got in his trees was blackbirds and plums.

And I like plums - I've never eaten a blackbird though.

Dawood ibn Kareem

1:35 PM

Mind you, you could probably make a decent lunch out of blackbirds and plums, if you had enough of each.

@DawoodibnKareem Blackbird piss then. The type of piss is not the important part here.

Blackbirds don't piss

@JohnRennie Proof?

Dawood ibn Kareem

@0celóñe7 They don't have the right sort of equipment.

@DawoodibnKareem Proof?

Dawood ibn Kareem

1:36 PM

@0celóñe7 dude, I breed birds.

Birds gnerally don't produce urine because of the weight. They metabolise urea to uric acid and mx it in with their faeces.

@DawoodibnKareem You breed the exact kind of bird that @JohnRennie has in his trees?

@JohnRennie Why can't humans do that?

Dawood ibn Kareem

@0celóñe7 Yes, I am John Rennie's official provider of birds for perching in plum trees.

@0celóñe7 don't know to be honest. You could ask on the biology SE I suppose.

@JohnRennie Maybe I should ask on physics

@DawoodibnKareem Huh.

1:38 PM

There's probably a metabolic cost associated with converting urea to uric acid, but for birds the weight saving is worth it.

Ok, so bird faeces then

The point is that he's a dedicated hunter

The things we discuss in the physics chat room ...

Join the Physics SE and learn about ... bird piss

@EmilioPisanty, you have to be kidding

Dawood ibn Kareem

sciencefocus.com/qa/do-birds-urinate

@EmilioPisanty oh, sorry, ignore that. I see you want to reward an exemplary answer.

> Scheduled Delivery:

Tuesday, 08/01/2017 , By End of Day

Oh come on

hurry!

Dawood ibn Kareem

1:45 PM

Apparently, the ostrich is the only bird that urinates. Its parents must be so proud.

@0celóñe7 I'd be tempted to just do a new clean install on the new disk and hope the current Windows key works ...

The best way to get a stable Windows installation is to start with a blank disk. Do a from scratch install then mess about with it as little as possible.

@JohnRennie I'm formatting a backup drive now

I'll probably do the clean install

I don't think you need a backup drive if you're going to do a new install. Just take out the current drive and put it somewhere safe.

Though I suppose there's always the risk of dropping it ...

@JohnRennie So what happens if I unregister my old Windows

Dawood ibn Kareem

Strange question of the day.

-4

Q: Datatype of the result of area of triangle

In java, how to find the area of triangle with base and height where its output must be a float value unless its inputs are float values? For example if base=4 and height=3 then the result must be 12 (not 12.0). If the base=5 and height=5, the the result must be 7.5

This gets more messed up every time I read it.

1:49 PM

@0celóñe7 the trouble is that I'm not sure what type of key Bernardo gave you. If it's a volume licence key (which is possible if it's a university key) then it doesn't need deregistering - it will just work.

@JohnRennie So you're saying I should install Windows on the SSD, and just try to put in Bernardo's key?

Try opening a command prompt and running the command: slmgr -dli

That will tell you what type of licence it is.

@JohnRennie Gimme a minute, have to get the computer out of boxes

@JohnRennie It appears there is another monitor in my house, unclaimed

Triple monitor setup baby

There's a fire engine parked outside my house ...

I wonder what's on fire?

my GPU

user228700

2:04 PM

@JohnRennie OK :-) I will keep that in mind!

@Kaumudi.H I fully expect that as you get into the swing of things real life will appeal more than the chat room does :-)

user228700

Nah, I'll still come around everyday :-)

user228700

I'm a bit attached at this point :-P

Dawood ibn Kareem

@JohnRennie What you saying?

2:22 PM

@JohnRennie Hmm, I plugged in the second display, Windows knows it's plugged in but can't see the right resolution

it's completely back too

@JohnRennie also I can't open the command prompt

@0celóñe7 Press windows-R and when you get the dialog asking you what you want to run type cmd.exe and click OK.

user image

Ah, OK, that's a retail key. With a bit of luck the licence Bernardo gave you should just work. You could try deregistering it.

crap, Windows thinks I have a second monitor

I just lost my Chrome to the dark second monitor

how do I get it to work?

Use slmgr /upk if you want to deregister the key. Have you got the key written down?

2:28 PM

@JohnRennie I am more worried about the monitor now

even turning it off doesn't convince Windows it doesn't work

Shut down the PC. Make sure both monitors are on and connected then turn the PC back on.

If the second monitor springs into life that;s great. If not, maybe you need the NVidia control panel to enable the second monitor.

Wonder why my boot time is sometimes 20 seconds and sometimes 3 minutes

lol, just cited a patent in my writing

@0celóñe7 If you are talking about dinner, we usually take that at around 11PM. Unfortunately, since I am in a dorm, it has now turned into 8:30PM..

@JohnRennie it is enabled by the control panel...

it's also reporting the wrong resolution

this is not my new ASUS panel

2:38 PM

How is the second monitor connected? DVI? HDMI? Displayport?

DVI

And the same for the first monitor?

@JohnRennie HDMI

user image

Should I plug my working monitor into the DVI port to make sure it works?

@DawoodibnKareem What is wrong with caressing the furniture? :P

Anonymous

@0celóñe7 @BalarkaSen Need help in maths. I can't understand what a "field" means. "In mathematics, a field is a set on which are defined addition, subtraction, multiplication, and division, which behave as they do when applied to rational and real numbers."....I can't understand what they mean by "behave as they do"!

Anonymous

2:44 PM

Seems somewhat vague to me :/

@Blue fixing my computer, give a minute pls

Anonymous

@0celóñe7 Sure, sure

@0celóñe7 I've been Googling to see if I could find anything, but with no luck. I was wondering if there's a problem with using the HDMI and DVI ports together.

You could try shutting everything down and disconnecting the HDMI so you have just the spare monitor on the DVI port. Or you could simply wait for the new monitor to arrive.

@JohnRennie You thought it was a not-enough-attention bounty?

yeah, that'd be pretty stupid

What is the highest number of views in a question in Physics.SE?

2:54 PM

@EmilioPisanty yes. I was surprised you thought it warranted more attention. However I agree that the answer you want to reward is a very nicely written one.

but yeah, it got a really good answer by a very new contributor and I thought I'd jump-start them past the new-user restrictions

but then it did just get yet another thoughtful answer

so

you never know

Actually I was very tempted to use a bounty to reward one of your recent answers that I thought was outstanding, but I reasoned you'd just give the rep away again :-)

@JohnRennie just because I give rep away doesn't mean that I don't appreciate bounties when I get them

@Blue my wifi has died and I'm not typing an essay on my phone

like that oscillating-charge-in-the-hydrogen-atom one, I'm super grateful

2:57 PM

I thought this was a masterpiece of clear, simple but uncompromising writing. If only science journallists could aspire to that standard :-)

Anonymous

I'm trying to make sense of Wikipedia

Anonymous

@0celóñe7 Okay. Later then...

@JohnRennie hah. Thanks =).

give science journalists a break, though. It's hard.

like, really damn hard

Ah, @JohnRennie I intended to ask this question before and I forgot. Have you ever written a book on Physics? I mean, anything on your specialisation, etc.?

unless it's ScienceAlert doing wonky shit, in which case, no, give them all the hell you can =P

3:00 PM

@Sid no. I never really had a speciality. I went into industrial research and the focus there is on getting stuff done by whatever means. You tend to end up being good (but not expert) in lots of fields.

Though on the up side you end up with a very broad knowledge of physics.

Ah, JR is a Jack of all trades..

@Sid to be fair that is a good description

But I think it helps me answer questions in a way beginners can understand because I'm not an expert so I'm not tempted to pitch my answer too high!

@Blue they mean the associative and distributive properties

you can look up the field axioms -- there are far too many, but they are all pretty intuitive because you've been using them for years

@JohnRennie currently running my old monitor off of DVI, so there's nothing wrong with that port

@0celóñe7 What happens if you connect just the spare monitor to the DVI port?

@JohnRennie I will tell you in a bit, I have to shower and eat

literally starving

@Blue if you have more specific questions I can answer them but the properties of rings and fields are just those that the real numbers enjoy, for the most part

and you can prove various "obvious" things from them

Anonymous

3:10 PM

in Mathematics, 2 mins ago, by Blue

Okay. I'm trying to explain in my own words what I understood from Wikipedia's "Classical definition". A field is any set, such that on any random pair of elements if we apply the operations "addition" and "multiplication" then we get an element belonging to the same set. Furthermore, the operations are to satisfy the properties of : Associativity, Commutativity, Distributivity and also Additive/Multiplicative identity/inverses. Makes sense? @JasperLoy @Semiclassical I think I got it now

Anonymous

@0celóñe7 I guess I understood. Thanks

@Blue Yes, but a note on lingo. No need to say "random" there.

Anonymous

@0celóñe7 Oh, okay. It seems fine without "random" :P

hello

3:53 PM

@JohnRennie how do I select which disk to boot off of?

@0celóñe7 you've got the new disk?

@JohnRennie no, I am planning ahead

OK. Your PC will have several SATA connectors labelled 0, 1, 2, etc and it will boot from the drive connected to the SATA 0 connector. So if you're planning to put the new and old disks in together put the new SSD disk on SATA 0 and the old one on SATA 1.

@JohnRennie the new disk is an M.2 one

But I wouldn't advise doing the installation with both disks present. Remove the old disk completely so you're installing with just the new SSD drive present.

3:59 PM

@JohnRennie ok. SATA connectors don't degrade when detached?

@0celóñe7 Are you using it in a PCIe adaptor, or does your motherboard have an M.2 socket?

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