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Archived threads in /sci/ - Science & Math - 38. page
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So i've got 2 springs
I need the 2nd spring to close quicker before the first spring, they have different poundages, but similar short distances.

1st spring is 3 mm distance to pullback with the poundage comparable to a pen spring

2nd spring is about the same distance to pullback 5mm with a poundage of about 3-4lbs

Again I need the second spring to close quicker
The question is, is the increased poundage of the second spring alone going to be enough speed from power to close faster as intended in the small distance
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>>7809526
Bump
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>>7809526
Boy, that's sure an interesting question, OP.
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>>7809604
Yes

Is there a neuroscientifically proven way to increase spiritual intelligence?
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>>7809506
Also, you know that the left/right side of the brain you just posted is bullshit, right?
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>>7809506

>right is the front

> left is the back

>"spiritual intelligence"

you motherfucker
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>>7809506

>Is there a neuroscientifically proven way to increase spiritual intelligence?

Yeah quit smokin dat sherm son

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>wavelength function gives,say, an electron a probability to be in a space range.

Does that mean that, even if we don't know, they do have a fixed location? Or is it wrong to assume they do have a position since they can also be considered a wave(wtf does that even mean)
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How about you learn the math first before you look for an interpretation?

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Let's say hypothetically we somehow managed to invent interstellar travel within the next decade, and then confirmed the location of extraterrestrial intelligence.
Then, when we got to their planet, excited to finally meet another intelligent species, we discover that they are primitive and are in what we'd call the bronze age.

Would you be disappointed?
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>>7809421
No, it would be one of the most amazing scientific discoveries of all time. If you've been to one post-singularity world, you've been to all of them. It's the historically lost ages that really matter.
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>>7809421
Why do the fuck. And I mean WHY THE FUCK would we even bother?

Woohoo, we found it, now could we please spend the money in shit like matters. Like giving more funding to the pure mathematics department?

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So I've got a circuit exam tomorrow, and the only kind of exercises I'm having trouble solving are RL or RC circuits with an impulse source.

Pic is an example, where Rb=10kohms, r_pi=1kohms,g_m=0.1S, Rs=Re=Rl=1kOhms and Vs=δ(t). I need to fine the Vc(t) function of the voltage across the capacitor without using the laplace domain, and I'm drawing a blank
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Wsr already redirected me here, so I really need this
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>>7809412
Why would any label have to be Pi
Also what is S?

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Is zero a natural number?
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>Is zero a natural number?
Yes.
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it's a placeholder for the additive identity.

>>7809373
retard
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>>7809378
You're wrong. It's a natural number.

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For an event to occur, in an interval of 28 days, you have a chance of 0 for the first 23 days and then chances $p_1, p_2, p_3, p_4, p_5$ (each in [0,1], no correlation between the p_i's) in the remaining 5 days.

You probe this setup at a random day, the particular day you choose is given by a probability P (with $\sum_{n=1}^{28} P(n) = 1$).

What are the chances for the event to occur?

For starters, I think for P(n)==1/28 constant, you get
$\dfrac {1} {28} \sum_{n=i}^{5} p_i$,
but that's just my intuition.
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>>7809341
if the sum of probabilities over 28 days is 1 and the probabilities of the first 23 are 0 then the sum of probabilities over the last 5 days are 1, so the probability of it happening in those days is 1...

Assuming they're equal, each day is 1/5 chance
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>>7809341
>What are the chances for the event to occur?
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>>7809341
>a chance
>the chances
Lrn2probabilly

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What would happen to a beam of photons if it were passed through a micrometer sized gap between two non-magnetic, perfectly conducting plates (undergoing the Casimir Effect) placed in a vacuum?

Why hasn't this experiment been done before?
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Btw im a girl :)
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I don't think you understand the casimir effect. Also, they're called waveguides and are quite common.

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I'm not a science major or anything, but I've heard that steady-state theory has been coming back in fashion somewhat. Is this true and if so, why?
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>>7809264
That seems unlikely. The steady state theory doesn't explain the cosmic microwave background.

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Anybody else find that most professors are actually really mediocre people?
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1) how so?

2) what else would they be?
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In my riding group there's one university professor. I was going to disagree and say that a biker professor is not mediocre at all but then I realised that he rides a Yamaha XJ600 which is one of the more boring bikes out there
So yeah, can't disagree
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>>7809232
Duh. The true geniuses of the world are the Li Wangs of the world who are hiding deep within bum fuck nowhere, doing nothing with their lives. I have never met anybody smarter than me, and will most likely never meet anybody smarter than me. Despite my abundance of intelligence, I remain a nobody. Why? Because I am intelligent enough to not give a single fuck about my image. I am intelligent enough to know that putting myself through pain for years on end just to build an image in other brains, brains that will one...

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nonlinear functional analysis

what's it good for? can it answer significant questions in science and math?

my prof said learning it would make me emperor tier in the math community. is there any weight to this?
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Its useful. Its interesting, and yes it has applications in physics theory and pde theory, as well as geometry and geometric analysis. I'm sure there's more. It won't make you 'emperor tier' at anything, its just another field of math, and one fairly useful to an analyst.
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>>7809231
Isn't it the basis of Quantum Mechanics?
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>emperor tier in the math community
>something that won't get grants because it's too abstract with no applications

Your Prof is an idiot if he actually told you to do this what your career. He should be telling you to get the fuck out of Pure Maths as soon as possible and get something that gives you some practical skills so you can leave Academia if you can't make it.

Which sadly, with the quality of teaching, projects and supervision. It will happen sooner rather than later for most people.

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Hi ,

Can somebody tell me if line 10 is correct ? Did I do a mistake?

∀x(A ∨ B) ⊢ ∀x A∨B , Note: x is not free in B .

1.∀x(A∨B) premise

2.¬(∀A∨B) assumption

3.x0

4.(A∨B) [x/x0] (∀xe),1

5.A[x/x0] ∨ B x is not free in B

6.B Assumption

7.∀x A ∨ B (Vi),6

8.⊥ (¬e) 2,7

9.A[x/x0] (⊥e),8

10.∀xA (∀x)i,3-9

11.∀A∨B (vi),10

12.⊥ (¬e) 2 , 11

13.¬¬(∀A∨B) (¬i),2-12

14.∀A∨B (¬¬e) ,13
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>>7809225
What book are you using? I've only worked with propositional logic in Fitch style deduction systems, not predicate logic.
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What the fuck is that shit, can't you write trees ? That proof should be trivial and I have no idea what's going on.
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Line 9 is wrong, you just proved not(B), you cannot use bottom-elim to conclude whatever

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Am i supposed to believe that Cal Berkeley is miles better than Oxford and comparatively better than MIT at physics?
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>>7809217
IDK, what's in the methodology tab?
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Yeah dude. Oxford and MIT have totally gone downhill. They're pretty much trash schools now, their degrees will be completely worthless in a few years.
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>>7809217
Oxford is kind of shit for natsci and MIT isn't know for physics either only engineering.

Hey guys. So where do you all go to find hard-to-find e-book versions of upper level math and science books? I have always been able to find my books until this year; can't find my Abstract Mathematics book. I was just wondering if anyone knew of any sort of mathematics/physics/chemistry textbook repository like deal.

Pic related, no matter how hard I try I can't find this fucker.
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http://gen.lib.rus.ec/

the book you want isnt on there but it took 2 seconds on google
apply yourself
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>>7809210
Thanks for the link. Not to be ungrateful about the second part of your post, but that book isn't on there. The solution manual is, but I found that when I applied myself.
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>>7809220
yes it is

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Hey /sci/ I'll cut right to the chase. I was interested in teaching myself mathematics as a hobby, and am starting with single variable Calculus. MIT OCW offers text+videos to teach this, along with problem sets and a final "exam".

I was just asking if /sci/ deems this a reliable resource? I assumed so since it's MIT but would like a confirmation.
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as good as any other resource of this type you could find
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...
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>>7809197
Probably better than a majority of the classes one could take elsewhere.

>>7809234
I think to get good you have to work problems and do proofs. If you just read you won't really know if you understand to the level of application rather than just getting the gist of it.

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