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9:00 PM
@MartinEnder the Ballmer peak one?
 
no, the ruby talk El'endia and TimmyD are talking about
 
Can I please get some more feedback on my ad suggestion? Thanks.
 
@mbomb007 maybe make the "FAQ" underlined so that it looks more like a link (I understand the whole thing is a link, but that isn't obvious to newbies)
 
@Maltysen None of the other ads have that. I think it should be obvious...
I mean, I could make it blue, too... :D
 
It seems... Spartan. Especially compared to the others.
 
9:07 PM
@El'endiaStarman The logo is reminiscent of the Java logo.
 
@mbomb007 but the other ones are more adlike than "advice banners" like this one
 
The font definitely needs work, but I don't have a good suggestion for improvement.
 
@TimmyD Spartan? As in, my ad will kick newbies into a well?
 
@mbomb007 THIS IS PPCG!! kicks into FAQ post
3
 
9:11 PM
The first adjective
 
@TimmyD You capitalized it. :D
 
I blame my phone. It automatically capitalized after the period.
 
1
Q: How should I submit an anonymous lambda that has a self reference?

PhaezeIn a lot of situations we allow for C# answers to simply be an anonymous lambda with the assumption that to run it it needs to be stored in a variable. So given that, is it acceptable to also assume that the variable have a specific name so that it can call itself? An example using Fibonacci: ...

 
@NathanMerrill That is a fantastic game mechanic concept.
 
9:27 PM
❯ git create
Updating origin
The authenticity of host 'github.com (192.30.253.112)' can't be established.
RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
Are you sure you want to continue connecting (yes/no)?
ಠ_ಠ
ayyy nsa
sorry but nope
 
»  git help create
Launching default browser to display HTML ...
fatal: failed to launch browser for C:\Program Files\Git\mingw64/share/doc/git-doc/gitcreate.html
@noɥʇʎPʎzɐɹC wot
@noɥʇʎPʎzɐɹC ? There is no NSA things
It's the thing trying to SSH on github, and the RSA fingerprint is not trusted
 
~/vsl-stl master*
❯ git push origin master
The authenticity of host 'github.com (192.30.253.113)' can't be established.
RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
Are you sure you want to continue connecting (yes/no)? no
ಠ_ಠ
 
@noɥʇʎPʎzɐɹC You need to reply yes :P
 
@TuxCopter but they could be playing MITM
@TuxCopter I know, but one time I tried and the cert was accepted
 
@noɥʇʎPʎzɐɹC You are paranoid o_O
 
9:30 PM
and it usually doesn't say that
 
@noɥʇʎPʎzɐɹC It's the goal... ?
 
@TuxCopter No, it didn't prompt me
I said no every time
@mınxomaτ yo, you're the security expert, does/might the NSA do such things? ^
 
@noɥʇʎPʎzɐɹC It's the good IP, nothing is MITMing you
 
@TuxCopter ?
 
I DNS lookuped github.com and the entry is for the IP 192.30.253.113
So no one is trying to MITM you :)
 
9:32 PM
@TuxCopter that doesn't mean they can't MITM.
the IP has nothing to do with it.
 
facepalm
 
go to GitHub.com for me and check the RSA key fingerprint
I just switched the chat room to https
 
@El'endiaStarman have you had any time to read Augustine? :3
 
@ConorO'Brien No, not really. :/
 
@noɥʇʎPʎzɐɹC You are really paranoid
 
9:33 PM
I've bookmarked it though.
 
I don't think anyone is MITMing you
 
good enough :D
 
@Poke I've never gone, but wow. Saturday is sold out.
@MartinEnder Maybe I should make the ad look more like the helpful paperclip from Microsoft?
 
@Downgoat link, pls request access
 
9:48 PM
@El'endiaStarman I know. I originally found it in HS, but 8 years later, I still think its one of the best game designs
They also have a Android/IPhone version, but they introduce a bunch of other game mechanics, like a timer, and rotating your phone, and the original is much better
 
@mbomb007 It looks like you're trying to write a challenge...
 
The computer that cracked Enigma was not TC wtf
 
huh. Apparently Java generics inserts a class check anytime you use generics
 
I bet a good number of users in here are too young to remember clippy
 
List<String> list = new ArrayList<>();
list.add("Hello");
String first = list.get(0);
in the above code, Java will check (at runtime) to make sure that list.get(0) returns a string
 
9:56 PM
Because generics are a bolted-on hack. There's no JVM support for them.
 
@TuxCopter you're french, right?
 
@ConorO'Brien Yep
 
@feersum that's not strictly true. You could write a language for the JVM that didn't make the check
 
How would I say, "there are many people, including ..."?
 
but its because of backwards compatibility. List list = new ArrayList<String>(); is valid code
so, because generics were bolted-on after the language, you have to do the check
 
9:59 PM
@ConorO'Brien Il y a beaucoup de personnes, y compris...
 
merci :D
 
you've all heard the question "what would happen if the sun went out". I'm more interested if half the sun went out
the sun would start accelerating
planets might follow?
 
Start accelerating? Why?
 
10:04 PM
because solar winds
we can move spaceships using light, but the light doesn't move the sun because it goes out in all directions
 
Define "went out"
 
stopped emitting light
literally that part of the sphere stopped doing fusion
 
But how would the light suddenly be all directed to one side?
 
it wouldn't be, but you'd end up with a bunch more light going one direction
 
Worldbuilding.StackExchange.com :P
 
10:07 PM
they don't like what if questions
 
idk, seems to be it would probably be roughly balanced out at the surface
 
48
Speculative Natural Science

Proposed Q&A site for people with hypothetical questions "what if" conforming to the natural sciences; Physics, Biology, Chemistry, Geology, etc.

Currently in definition.

 
Poor choice of name there... "speculative science" sounds like pseudoscience.
 
Whatif.xkcd.com :P
 
@NathanMerrill some empirical progress regarding KOTH's : there appears to be a linear relationship between "how much the rankings are changing as the competition progresses" and "how close the current ranking is to the true ranking."
 
10:12 PM
that would seem to depend on the ranking method, no?
 
It might... I would need to test it out with some other options. Also important to note is that the relationship is of the form y=mx+b not simply y=kx
 
@NathanMerrill srs answer -- presumably the mass is still there, just for some handwavium reason, part of the sun stopped fusioning, right?
 
which means that there is a "brackground" amount of some amount of change.
 
@PhiNotPi you're saying that if the ranking isn't changing, we still might be off by B amount?
@TimmyD right
 
Yes
 
10:16 PM
Woah. Programmers is officially software engineering now. I honestly thought that would never happen
 
@NathanMerrill this is actually law of large numbers stuff. If you flip a coin many times, the ratio of heads to tails will approach 50%. The expected absolute difference, however, will diverge.
 
OK, so we just need to figure out how much energy is being output in terms of photons/radiation versus how much mass is still there.
 
@PhiNotPi if we assume that there are never two perfectly matched players, then the absolute difference will always diverge in the right direction
 
According to this (which cites Brian Cox, so it's at least in the ballpark), the sun emits 2.8x10^26 J of energy.
 
I personally expect this linear relationship to hold for several ranking mechanisms... it will probably be the slope and constant that are different.
 
10:26 PM
So, with half the sun no longer emitting radiation, we're at the other half emitting 1.4x10^26 J worth.
 
@TimmyD how do you figure out how many are going in each direction?
1.4, you mean?
 
What is the basic premise of this what-if?
 
Half the sun suddenly stops fusioning.
@NathanMerrill Assume a perfectly spherical and perfectly uniform sun...
 
In this case that the amount of fusion drops by half, I don't see any reason for the light or ion emissions to become non-uniform depending on direction.
 
literally half of the sphere stops fusioning
 
10:28 PM
@feersum But that's boring.
 
the other half is still going strong
 
Why don't you put the handwavium at the surface then, rather than the core?
 
0
Q: DFA construction

Devivk please check the regular expression and DFA for the following language. Define the alphabet Σ = {0, 1, 2, 3} and the language L that consists of all strings over Σ such that the sum of the symbols in the string is even. For example, the strings 022 and 12313 are both in L but 012 and 333 are no...

 
@feersum I don't really see any significant difference between the two. Sure, in one, the number of protons is doubled, but I hardly think that that is going to make that much difference
 
@NathanMerrill Who said anything about protons?
 
10:32 PM
11 mins ago, by TimmyD
OK, so we just need to figure out how much energy is being output in terms of photons/radiation versus how much mass is still there.
 
I thought the motivation for this calculation is an assumption that the emissions will be biased in a certain direction, creating some kind of ion drive
 
well, considering that one half of the sphere isn't outputting photons, I expect that to occur
 
It's not like hydrogen fuses and then some photons fly directly to space
The energy is released in a small region at the core and propagates through outer layers gradually
 
so what would happen is that the opposite side would still emit photons
but it wouldn't be as bright
that said, I'm no longer convince the sun would move
 
My hypothesis is that while half as much energy is released, it still appears to be spherically symmetric from the outside.
 
10:41 PM
I still think there'd be a measurable difference in light on the two sides
 
irb(main):001:0> 1000.chr
RangeError: 1000 out of char range
        from (irb):1:in `chr'
        from (irb):1
        from C:/Ruby23/bin/irb:11:in `<main>'
ಠ_ಠ
 
So, let's presume that the "dark" half is completely dark. No output at all. If you take those 1.4x10^26 J, and use J=N*m for the conversion, dividing it by the mass of the Sun and the half the surface area of the Sun, you get ... 2.317x10^-21 m/s/s ... so, practically nothing.
 
huh. The sun is massive
 
What does "1.4x10^26 J" represent?
 
Half of the total energy output of the Sun.
 
10:44 PM
Is that photons only?
And it has the wrong units.
You'd want J/s.
 
Yes, J/s, sorry
See my previous link where I got that number.
21 mins ago, by TimmyD
According to this (which cites Brian Cox, so it's at least in the ballpark), the sun emits 2.8x10^26 J of energy.
 
wait, not all energy from the sun is light? What form is that energy in?
 
Umm, it's electromagnetic energy. You could call it "light" for certain definitions of "light."
 
It also relases massive particles (the solar wind as you mentioned before)
 
Yeah, none of my above calculations included the solar wind, just pure photonic energy.
 
10:50 PM
6<NUL>1:8.7; Code in my new esolang to print the ASCII table
 
I expect the acceleration from ejecting massive particles to be much larger than from any photons, so the ion drive could still work.
 
@NewMainPosts missing
 
> While approaching Kurumoch Airport, Kliuyev made a bet with Zhirnov that he, Kliuyev, could make an instrument-only approach with curtained cockpit windows, thus having no visual contact with the ground, instead of NDB approach, suggested by the air traffic control.
> Kliuyev further ignored the ground proximity warning at an altitude of 62–65 metres (203–213 ft) and did not make the suggested go-around. The aircraft touched down at a speed of 280 kilometres per hour (170 mph) and came to rest upside down.
 
wikipedia indicates that it outputs 3.846×10^26 W of energy
which is rather close to the 2.8x10^26 of photons
so either, that isn't including solar wind and we are just talking about variations in measurements
or solar wind really doesn't contribute that much
 
0
A: Sandbox for Proposed Challenges

Destructible WatermelonQuine tree Inspired by that really weird quine challenge For this challenge, you must choose three languages. (Sandbox: not sure if different versions of same language (Python 2 and 3) should be allowed) These languages will be referred to as X, Y, Z. For this challenge, you must write a progra...

 
10:56 PM
"so every second that means the Sun blows off about 1.5 trillion grams, or 1.5 million tons of material"
Yeah, I don't think the solar wind will make much of a difference
so, all in all, basically nothing
how lame :/
 
I disagree.
 
well, I've got to go, but please prove me wrong :)
 
Wiki solar wind says it exerts a pressure of 1-6 nPa at a distance of 1AU.
Let's assume the low end of that range (1 nPa), integrate it over the whole sphere, and asssume all the force goes in 1 direction.
 
@JonathanAllan the frobenius count atom uses the usual dynamic programming method, and frobenius solve uses a memoized recursive function, so their performance is alright. Then when I benchmarked against Mathematica, the difference was dismaying, and I found a paper explaining why the search was much faster in Mathematica
 
how do you convert Pascals to watts?
 
11:01 PM
Then we get 1.4e25 N of force.
 
@Pietu1998 carefully
 
The solar mass is 2e30 kg.
 
I had a peek, it's certainly better than inspecting all the combinations of up to target coins!
 
So we'd have like 1e-5 m/s^2 of acceleration.
That would become noticeable fairly soon.
 
Yeah, if all of that force is concentrated in one direction. I didn't perform that step in my calculations, either.
 
11:04 PM
but I don't think you're exerting all that force to the mass of the sun
 
Spreading it over the half sphere would probably just multiply it by 1/2 or something.
So I accounted for that by choosing the lowest solar wind number :)
 
My physics is really bad, but you'd need to do a bunch of angular conversions to apply the appropriate force in the correct direction, because most of the output close to the "poles" is going to cancel each other out.
 
But I kinda don't get where the solar mass comes in.
 
Aww crap I typed cube instead of square on the radius :(
 
11:08 PM
@flawr My favorite plane-related videos are like this one , where the plane is basically flying sideways due to crosswind.
 
So everyone will be dead from the other bad stuff before sun acceleration can matter.
 
I think you'd need to consider the masses and quantities of the particles of solar wind to convert the pascals to watts.
And sun acceleration shouldn't happen since solar wind is uniform around the sun (AFAIK)
 
The premise is that the particles stop coming out of one side of the sun.
 
Oh.
Well, I guess you'd then need to integrate with the angles and stuff.
 
'night
 
11:24 PM
I may be horribly wrong, but I think the total horizontal force from applying a total force of F uniformly to the inside of a hemisphere would be 2F/pi. That multiplied by half of 2.8e14 N and divided by solar mass would be 4.5e-17 m/s^2.
 
That's a little bit smaller than the size of a hydrogen nucleus, which is about 1.75×10^−15 m
Or, about 8000 years to travel one meter.
 
...I'm pretty sure I f'd up somewhere.
But still, the order of magnitude should be correct
 
Yeah. Like feersum said, though, everyone will be dead from the other bad stuff long before the Sun's acceleration can matter.
 
Anonymous
What a pleasant conversation to walk in on
 
So, I guess the Earth will end up facing the dark side at some point?
 
11:38 PM
Well, if half the Sun suddenly stopped fusioning, it's not a very pleasant conversation.
@feersum Winter is coming.
 
The worst part of being hit by a giant asteroid is the reduced sunlight IIRC.
So it's like getting hit by a giant meteor once a year.
 
11:57 PM
That might be the worst part of the Earth getting hit, but if I got hit by one I wouldn't be so concerned with the reduced sunlight.
 
0
Q: Maximal number of regions obtained by joining n points around a circle by straight lines

OliverLet's define f(n) as the aximal number of regions obtained by joining n points around a circle by straight lines. For example, two points would split the circle into two pieces, three into four, like this: Make sure when you are drawing the lines, you don't have an intersection of more than two...

 

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