Hello I wanted to share my new youtube channel.
I record video of the moon for now.
https://www.youtube.com/watch?v=VZrhojCh2oI
https://www.youtube.com/watch?v=2jOtdUYZXCo&t=310s
Bonjour mon ami Toulousain!
Tu as quel telescope?
>Hello my friend from Toulouse!
>What telescope do you have?
Bonjour ! J'ai un maksutov 90/1250 sur une monture GoTo :)
>Hello ! I have a 90/1250 maksutov runing on a GoTo mount
>>8616685
Excellent! Tu dois bien te faire plaisir avec ça :D Tu as des photos de venus/saturne/jupiter prisent avec? Et tu as quoi comme appareil photo?
> Excellent! bla bla bla...
>mfw knowing and using integral notation makes me look smart
integral notaton 0
inaugural notation 1
>integral notation
You mean drawing a big S that stands for "sum?"
It only makes you look smart to normies.
i wonder how many girls have texted you this week.
So wait, what is the superior engineering major again?
>>8614811
Petroleum>nuclear>chemical>architectural>electric>computer>everything else
mechanical
>>8614811
ot op but, specifically which major for:
-bare dollar?
-most interesting?
-jobs/job security?
I was watching today's Wildberger video and at some point he decided to play the game of the reals. He decided to solve a problem in complex numbers using the usual methods taught at universities instead of his patented method.
This involved calculating an angle and for that he needed to compute the arctan function of [math] \frac{12}{5} [/math] and he used used the series
[math] \arctan(x)=x-\frac{x^3}{3}+\frac{x^5}{5}-\frac{x^7}{7}+\dots [/math]
But then he said that actually this series diverged for the number [math] \frac{12}{5} [/math]. But that makes no sense. The arctan function actually has a value then. So what gives? That series is BULLSHIT.
I, for a moment, disbelieved Wildberger (I shouldn't have) and decided to prove such a thing. That the series would diverge. I did it on paper, got my Calc 2 notes out. And did it. And it is true.
Is this one of the many flaws with real analysis? How come this is just coming to light? Why is Wildberger the only person to say this? Why is everyone else hiding the fact that real analysis doesn't work?
Here is the video and the part where he says this:
https://youtu.be/Snq7UJT8EWg?t=12m27s
>>8620030
>try to sum series outside the radius of convergence
>holy shit why is it diverging
>>8620046
>radius of convergence
Nice damage control
>>8620030
It doesn't converge to a rational number
Therefor it diverges.
too lazy to actually check the video
There has got to be at least one electrical engineer here.
If you have a wearable thermoelectric generator and you spill water on it will it shock you?
I want o experiment with them but I don't want to seriously hurt myself
>>8620022
Do it OP.
Do it and post results.
>mVDC
Have fun powering LITERALLY NOTHING.
>>8620036
There was one new type that got 20microwatts.
I just hope it doesn't shock me
Well, chemists of /sci/, why is there a precursor to Cyanide in my face wash?
IDK, why is there poisonous gas and explosive metal in our food?
>>8619724
the third chemical in your shampoo is literally two very poisonous substances i cant imagine why you would want that in your hair
>>8619724
Because seed oil is presumably good for the skin, so Loreal adds seeds to their cocktail so that they can write appealing shit on the bottle. Women and faggots just love when there is fancy seeds in their face wash.
Lots of seeds contain cyanide. Including apple seeds. If you think cyanide is the worst of your worries on that chemical list you're in for a ride.
tell me something about geometries you find interesting.
https://youtu.be/skvnj67YGmw
>>8619507
>linking to vsauce.
fuck off.
https://www.youtube.com/watch?v=Cld0p3a43fU&t=55s
Why is baking soda so magical?
Wikipedia yields little information.
>>8619471
What do you mean by 'magical'?
>>8619473
It's many uses:
whitens teeth
absorbs ordors
good for cleaning
good for baking
I'm sure there's more.
I mean, there must be some unique chemical property that makes it so useful for so many different things.
Would this be possible, and how would it be called? It looks like cyanuric acid, but it can’t be.
>>8619397
Nitrogen cannot covalently bond four other atoms, it can only form three. Those H atoms (I assume they are hidrogen atoms) that you attached on N cannot be there. Thus such a molecule cannot exist and if you remove the H atoms from N, the molecule actually becomes cianuric acid.
>>8619433
But no nitrogen atom is bonded to four atoms in my picture.
>>8619436
The guy presumably meant four bonds.
>you can't win at poker
>lol it's just luck
>gambling
Is the concept of expected value too complicated for normies?
>>8619354
Nobody says poker is just luck. I feel like you just watched a poker movie for the first time and are greentexting your retarded 2 hour ago self.
Winning at poker involves reading the table and the bets more than calculating probabilities in your head.
every hand in poker is 50:50 - you either win or lose
Can a brainlet confirm my suspicion that the there is an error in the computation of this normal field namely |gradient(f)|
or am I retarded?
grad (f) = idf/dx + jdf/dy + kdf/dz so it is right
>>8619306
but how dey dun that |gradient(f)|= 1/6 tho
yeah
n=∂f/|∂f| must have
|n| = |(∂f/|∂f|)| = |∂f|/|∂f| = 1
everywhere
but clearly e.g. at
r=(1,0,0)
the n in the pic has value
n=(1/6)·(4,0,0) and thus
|n|=2/3<1
Can you explain to a brainlet why the Banach–Tarski paradox is so controversial?
>>8619158
It's only "controversial" among the pop-math crowd who don't actually understand it.
>>8619158
>A pea can be chopped up to make the sun
What the fuck this theory is retarded what next my dick can be chopped up to contain the entirety of the observable universe?
>>8619166
The only think that I got from that is that dividing inifitny by 2 is still infinity which isn't such a wild claim.
Hey /sci/ I don't understand how to find the last part of this Physics problem.
A frustrated student pushes a 1.7kg book with a velocity of 5.1m/sec on a surface with a coefficient of friction of .73. How far will the book travel before coming to a rest?
This is not something I remember being taught but it's a practice problem for an upcoming module exam.
Thanks
I'd guess there is a force acting against the motion, and if c=0.73, it's
F = c·m·g
where g is the gravitational acceleration, and so you got an acceleration
a = F/m = c·g
So
v(t) = v(0) - c·g·t
v(t) = 0 ==> t* = v(0)/(c·g) ==> v(t) = c·g·(t*-t)
x* = int_0^{t*} v(t) dt = c·g·(t*)^2/2 = v(0)^2/(2·c·g)
0 - 1/2*m*v^2 = - .73*m*g*d
>>8619117
1/2*v^2 = (0.73)*g*d
Will having some red wine when im on Amoxicillin stop them from working? I have an ear infection and im miserable
I'm not sure you understand how antibiotics work.
Drink up, it's fine.
>>8619062
I don't, i just remember someone mentioning its bad so wanted to check.
>>8619060
I drank a few beers on several occasions last time I was on antibiotics and I was fine.
>PhD in mathematics
>300k starting
Memes aside, can anyone explain why the translation of salaries from the EU to the US is constant at about a factor of 2, while the price of living is roughly constant (factor of 1.6 says one source I found), although the direct money conversion from Euro to Dollar fluctuates as fuck?
A very good stating salary with a PhD in STEM would be, as I understand it,
Euros
65k (5.5k per month, or 4.6k per month if you have 14 salaries)
Dollars
130k (11k per month)
(does that sound about right?)
but whether you should start working here or there seems to fluctuate as fuck.
Someone understand this?
with
2 / 1.6 = 1.25
for a € -> $ conversion rate to be balanced
>>8619056
not using feynman-kac/blackscholes/martingales etc. on something you don't know and take the result as an undisputeable answer.
never gonna make it as a quant 300k starting