Archived threads in /sci/ - Science & Math - 1962. page

>>7794830
Trivial upper bound is 11 (weight ball 1 against all balls)
Good upper bound is 4:
Weight 3v3. Then you know which half has a defective one (the one being weighted, the one not being weighted). 6 balls left. Repeat, 2v2. If they're equal, you got 2 where the problem can be. Weight one good ball against one of them and you got it. Otherwise, 4 balls left, you know AB weights more than CD. Take A and C out. Weight BvD. Then weight AvB and you know.

Can we do better? I can't think of how to get it on 3, but we do get more information when weighting 4v4 at the start. If they're equal, we have 4 balls left and can find the odd one in 2 moves. Otherwise, we have 8 balls + weight info. Can this be done in two?

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>>7794830
R = right side of scale
L = left side of scale
O = not weighed

where you put the coin on each weighing also determines which coin is the defective one. For example, if the scale tips to the right on the first weighing, is even on the second weighing, and tips to the left on the third, this corresponds to the 4th coin being heavier.

>>7794830
>Step 1: 4v4

Case 1 : 1/3 chance of equal weigh -> defective is one of the 4 other balls
>Step 2 : 1v1 with two of the balls, if there is a weight difference it's one of those 2, if not it's one of the other two
>Step 3 : weight one of the two possible defective balls with a normal ball. If there is a weight difference it's this ball, if not it's the other

Case 2 : 2/3 chance of different weight on step 1 -> defective is one of the 8 balls weighted
>Step 2 : 2v2 with four of the balls, if there is a weight difference it's one of those 4, if not it's one of the other 4
>Step 3 and 4 : See Step 2 and 3 of Case 1

The average number of steps is 3.66 .

>>7794845
>Can this be done in two?
Only if you are really really lucky. If you weight 1v1 and have a difference on the first try, you can weight one of them with another ball. If the weight is different on the second step, the odd one is the one you kept for the second try. If the weight is the same, it's the one you put away.

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This guy is also quite nice, he has loads of cool stuff

https://www.youtube.com/user/bkraz333

*bump*

Read a book you fucking millenial

Anyone of you that have had that one teacher who sucked?

>>7794128
>>7794144
>posters: 1
samefag

uh vectors are additive so i dont understand??

>>7793475
Not being feminist does not equate to misogyny. Misogyny is a social construct. Humans have sexual dimorphism. It's fair to say that our base instinct/animalistic nature includes men acting dominant over females in certain ways.

>>7793475
Anyone who regularly interacts with women inevitably becomes misogynist. Only blue-pilled reddit cuck manchild neckbeard virgins will deny this fact. Don't believe me? Ask Chad. He fucks a different slut every night and he knows very well how worthless they are.

> psychopathy is an evolutionary adaptation
> lack of empathy for animals is an evolutionary adaptation
> accepting rape is an evolutionary adaptation
what the fuck are you talking about ?
And what is your definition of mysogyny ?

Drugs

>>7793310
Start defining things and ask yourself if your answer makes sense in the context that you're given. This doesn't really help (either you get it or you don't), but at least you're wasting some time for the exam to end.

>>7793611
>Thinking

Oh, don't make me laugh. Thinking is unnecesary when you already know everything.

This is what I have started doing. Write everything really nicely. Let me give you an example.

In a math test, don't write x, write [math]x[/math].

The same goes for every mathematical symbol. Write the symbols really, really slowly so that they look really good, almost like if you were using Latex. Then, not only will you be a genius but everything you solve will also be considered a work of art.

It is working for me and it is really fun when I can actually nail the symbols well. One that is giving me problem is the notation for range space but I just need to keep practicing problems about range spaces so that I can keep drawing the symbol until I nail it.

>>7791976
>>not realising they're using quantum entanglement to communicate at FTL speeds
Which is impossible.

>>7791976
>>not realising they're using quantum entanglement to communicate at FTL speeds
You can't use quantum entanglement to communicate with.

>>not realising dark energy is used as optical camouflage
Dark energy is just a term for whatever it is that's causing the universe to accelerate faster and faster. I think you're confusing it with dark matter, and even then you're wrong.

>So is it agreed that KIC 84628542 is an alien megastructure?
No.

> Reckon they've spotted us primitive humans?
It'll be over a thousand years before our first radio signals reach it, if they do.

>>7791976
>>expecting advanced alien civilization to leave EM signatures

Why do we even do this? The inverse square law makes an EM signature too weak to be noticeable.

>>7785271
I just love to see Tyrell and Lashawn's faces when I get up all in their sister's black hole

The fact that they are not real, yet used as a hyper sensationalized garbage in pop-sci films that attract DUDE WEED LMAO type of people

I think Interstellar's interpretation of them is the most interesting one. And no one knows what happens inside a black hole, so it's a possible one as well.

>>7795319
>polycyclic bis orthoester of oxalic acid
plausible, just do a SciFinder search for it

I would pay a good amount for some ATP, DNA, ribosomes, enzymes, and other things. I'd say that if you did that, you could sell all of the materials for a few hundred thousand dollars

>>7795004
Organs easily get in the tens and hundreds of thousands.

>>7794981
If Sagan said "the chemical elements etc etc," then he'd be exactly correct, if not an over-estimate.

He said chemical elements, i.e. things that you find on the periodic table. If you took a human body and split all the compounds into the smallest naturally occurring pieces, you'd have a collection stuff worth very little to anybody.

>>7795055
I know that. What I'm criticising is that some Tumblr faggots get the general idea behind that and then turn it into a lie (yer chemicals are worth nuffin you guyz!1!) and spread it everywhere.

>>7794881
In bed, possibly in the shower.

>>7794881
a fleshlight

nowhere because the most powerful tools in the hands of an idiot is still useless

Word embedding models? Anyone?

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Yep, used it on a Kaggle competition.

Let's hear it, OP.

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>>7794697
>If it is accepted that 0.9999... and 1 represent the same number. Now, consider the open ended interval [0,1). Then, any x in this interval will be 0 <= x < 1. So can x be equal to 1...

>>7794697
The interval [0,1) has no maximal value. That's essentially the mistaken assumption you're making. Infinitely close to 1 is 1 and the interval does not contain it.

0.999... is a hypothetical number that is not contained in the set [0,1)

Get your meme shit out of here.

>>7794293
>Speed run autism

https://youtu.be/kpk2tdsPh0A?t=2m5s
he thinks he is hot fucking shit for holding down an A button into the next area

>>7794288
Because just because a course is called "Introductory" does not mean it's cursory or easy?

>ITT prestige whores

>>7794288
>MIT can't even figure out how to name its classes like a normal school

do it if you want to dont if you dont

>>7794192
I want to do it I'm just wondering if this claim is true and if so, to what extent?

>>7794187
Not really. I feel like you encounter the math in physics before you see it in math(with the exception of vector calculus and ODEs). However, if you want to do grad physics, I would encourage math because you'll actually understand how the math works and can learn more complex math faster.