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Archived threads in /sci/ - Science & Math - 1723. page

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How are [math]0\cdot\infty[/math] and [math]1^\infty[/math] "indeterminate forms", given that [math]0+0+0...=0[/math] and [math]1*1*1...=1[/math]?

[math]0[/math] is the identity element of addition, and no matter how many you add together, it will still be [math]0[/math]. The same goes for [math]1[/math] and multiplication. What gives?
68 posts and 1 images submitted.
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Because there are sequences that do not converge to 0 or 1. Algebraic rules do not apply here.
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>>8024686
Because arithmetic does not apply to infinity
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>>8024686
you are right, actually. if you define arithmetic with infinity, it works like that

however, 0*inf and 1^inf usually don't mean arithmetic. they usually mean babby calculus student tried plug and chug and got shit, and now he has to fix it

see >>8024689 for example, talking about convergence when it has nothing to do here

https://en.wikipedia.org/wiki/Transcranial_magnetic_stimulation
https://www.autismspeaks.org/blog/2016/03/25/transcranial-magnetic-stimulation-autism-evidence-benefit
http://www.brainstimjrnl.com/article/S1935-861X%2813%2900299-4/abstract?cc=y=

Could this be the way to cure Autism? Could Transcranial Magnetic Stimulation be the future of Brain health?
53 posts and 4 images submitted.
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>>8020734
We can test it on /pol/ and find out
>>
People who can't empathize give me the creeps.
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there's none they don't have, theory of mind

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Why are animals so stupid?

https://www.youtube.com/watch?v=GaMylwohL14

millions of years of evolution and they get spooked by mirrors
79 posts and 7 images submitted.
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>>8021255
don't have the processing power to run the latest version sentience.exe

so their self awareness is limited
>>
animals are so dumb
>>
>>8021255
Human like intelligence isn't the end result of natural selection, other animals are just fine doing what they do.
Natural selection equipped humans to understand and comprehend medium objects moving at medium speeds.
Our natural ability is to avoid being eaten by predatory animals on the African plains.
We were not equipped with the ability to understand things like quantum physics and rocket engine design, those things are a fortuitous happenstance of our larger brain and physical attributes that are tailored to facilitate building things with our hands.

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Are the japanese immune to smoking? What's their secret?
100 posts and 6 images submitted.
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>>8023953
They walk to work.
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>>8023953
>What's their secret?

fondling girls on the subway
>>
Radiation.

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There's a scientific proved reason to have a gf or being married, like some psychological, health or any effect treated as a benefit for a man? Or it's better to be a MGTOW for a STEM's dude (and have casual sex if you're alpha enough to achieved)?
123 posts and 18 images submitted.
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Yes, and this is common knowledge.
- Serotonin/reward chems are up.
- Social survival goes up.
- Sometimes economic survival goes up.
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>>8017441
Alright, but how hard is to get a woman that can really give you all that and in an acceptable form?
The modern woman is a pain in the ass sometimes, so you can waste time finding a woman to settle down instead of approach that time in STEM and be functional and independent (specially if you are oriented to research).
>>
>>8017439
yes weak men crave the validation of their existence and get depressed if they fail to feel relevant, responsible.
The best way for a man to cater his need for approval is to serve some woman (and some of her children) through emotional&financial support.
Men are pleased to contribute to someone else life, to support their family.

Why women are a good way to feel relevant? Because women love to be provided for and each woman will always find a man ready to please her.

THe problem for men is that they are disposable in the eyes of each woman, since all men wish to serve the few women who talk to them.
Men must thus invent several ways to please women, invention and creativity which strengthen their feeling of being worthy, relevant, in tough with reality.
Men are too impotent to find other way to feel real.
Once that the a woman replaces a man by another provider, the man gets very upset and depressed.
THis leads men to think that they are better than women, stronger, smarter and that they must built a life outside women. Some men manage to indeed built an empire, but they will always loos it for some women.
Women give meaning to men and betas, no matter how successful outside women, will always give up everything for some relationship with some woman who claim to fancy them.

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Does orgasming take anything out of a woman? How does it affect her body other than the pleasure in the brain?
59 posts and 4 images submitted.
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>>8020907
Some do jizz
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>>8020948
Yeah but can they just lay in bed all day having one orgasm after another with no repercussions?
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>>8020951
well eventually you'd start encountering side effects like dehydration or chafing from the sheer amount of rubbing you're doing but realistically the worst you could do is make her a bit sore afterwards.

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ok, so I started to watch those nicola tesla BS magic videos from those new age youtube retards.

But then I got an idea, what if someone made a sort of modem but for energy it receives from traditional energy sources and transmit it to other devices like wi fi internet.

what if this modem sent energy wireless to some small receptor that power your normal electronics?
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>transmit it to other devices like wi fi internet
>some small receptor

the only retard here, is you
>>
>>8027862
I'm basically talking about making a wifi device that transmit energy wireless.
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>>8027866
I know exactly what you are talking about, but do you?

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What causes homosexuality?

Is it a genetic problem or a mental disorder?
72 posts and 7 images submitted.
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>>8021855
i don't know. do you consider yourself mentally impaired?
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>>8021855
What causes shitposting?

Is it a genetic problem or a mental disorder?
>>
>>8021897
>>8021907
spotted the faggots

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Would it be possible to make a camera that takes pictures mechanically? Like with gears and shit? Trying to think of a way to make a camera that can operate on Venus for an extended period of time.
56 posts and 10 images submitted.
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Bro bro

Cameras originally worked by mechanically opening and shutting (quickly) an opening which had a piece of material that had chemicals on it. There was no electricity/battery.
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>>8021142
>operate on Venus for an extended period of time
Why would a mechanical camera operate longer?
>>
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>>8021156
I want to take pictures mechanically without using film. Film cannot exist at venusian temperatures.
>>8021160
Semiconductors stop working at venusian temperatures. Mechanical systems can operate at higher than venusian temperatures. For examples of this see jet engines. As long as shit remains in the same shape mechanical systems work.

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>>8019732
1
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>>8019763
2
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>>8019774
3

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That the reason why aliens haven't contacted us yet is because they're observing our development until we're "mature" enough to join the intergalactic community?
285 posts and 26 images submitted.
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You can make up any nonsense and call it a hypothesis
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>>8004809
>hypothesis
how do we test it
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>>8004815
Its one of the hypotheses of the Fermi paradox. Look it up asshole.

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Please help with a gas pipeline problem we are having at my company. There is something stuck in a pipeline but the operators have no clue where. My question is, can I determine where the obstruction is in the system by recording the rise in pressure over time from a fixed measurement point upstream of the block? We can monitor static pressure, differential pressure, flow rate in mcf/d, temp and total volume sent past the sales meter. Ideally I would like to bring an equation to my masters to get a few crumbs from the table. Thanks.
61 posts and 9 images submitted.
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>gas pipeline problem we are having at my company
>operators/technicians have no clue
>ask 4chan for advice

you guys are running a real bang up operation
>>
>>8021482
kek

try ideal gas law PV=nRT

if you know P, n and T, you can find V, which basically gives you the length of tube you need.

If this doesn't work as a first approximation, you'll need to use van der waals equation I guess
https://en.wikipedia.org/wiki/Van_der_Waals_equation
same thing, find V.
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>>8021482
Have you tried knocking on the side of the pipe until it sounds different somewhere?

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So what's the magical "limit" in this image referring to? Does neuromorphic computing not exist?
13 posts and 3 images submitted.
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>>8026249
Conservation of mass and energy, locality, thermodynamics, decoherence.

Read fiction by people trying to envision "post-singularity" tech. Tends to include FTL, high-fidelity quantum computing, nano-tech without over-heating problems, stimulated baryogensis, etc.
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>>8026249
It's called "reality".
Singularity is the biggest pseudo-sci scam of the time.
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>>8026249
The limit is what the rules of the universe allow to happen

Hey

I want to replace oil
Volume = 1500ml

I can just get 250ml out at once then i have to refill it with fresh oil... the oil mixes 100%

So:
Step 1:
1500 old oil -> 250 ml out and 250ml fresh in

Step 2:
1250 old oil 250ml fresh oil
When i let 250ml out and refill with fresh oil:
1040 old oil 460ml new oil....

So how many times i have to repeat that to get 95% new oil ??
18 posts and 1 images submitted.
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hang on op
imma try to work it out
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>>8025824
>ubuntu
Nice. You on 16.04 yet?
>>
http://math.stackexchange.com/questions/971202/is-my-interpretation-on-the-specific-replacement-in-a-solution-is-correct-or-not

see if this helps

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Does anyone else sometimes experience euphoria during the night? I get this occasionally and never experience it during the day. I also tend to feel more awake and motivated during the night than I do at day. Anyone the same as me?
25 posts and 6 images submitted.
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>>8025638
I know that feel brah
>>
same, does anyone know what causes this?
>>
i only feel euphoria after an epic dream

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