Anonymous
The phone call that saved mathematics 2017-01-15 05:55:26 Post No.8603385
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The phone call that saved mathematics 2017-01-15 05:55:26 Post No.8603385
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The phone call that saved mathematics
Anonymous
2017-01-15 05:55:26
Post No. 8603385
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What do you think was said?
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>>8603385
bogposters get out
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>>8603385
"only the cheese please"
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>>8603385
Hello.
My name is Simon Cosgrove. I am autistic and I need to see a mathematician.
Anonymous
Want to study at library but I'm weird 2017-01-15 05:33:41 Post No.8603351
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Want to study at library but I'm weird 2017-01-15 05:33:41 Post No.8603351
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Want to study at library but I'm weird
Anonymous
2017-01-15 05:33:41
Post No. 8603351
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Can't concentrate in silence with other people so close.
Like I'm sitting at the airport and I'm enjoying /sci/.
Someone sits next to me and I feel uncomfortable.
Am I the only one?
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>>8603351
>Am I the only one?
You're just autistic, like 90% of this forum, do not, you're not the only one.
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>>8603351
Hey I went there when I was in melbs
I think huge libraries like that are pretty hard to study properly in
Smaller local libraries with less traffic can be good
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>>8603351
>Someone sits next to me and I feel uncomfortable.
what is really interesting is that space bubble differs based on culture (probably based on pop. density).
what is even more interesting is that in vr the space bubble is still enforced.
so if you are waiting in a vr airport, you will still feel uncomfortable when someone virtually violates your comfort space.
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Read this and then throw away your cell phone;
https://arxiv.org/ftp/arxiv/papers/1104/1104.5008.pdf
better yet, get out of the city (tower risk)
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>>8603137
>arxiv
>theoretical biology
You know what to do.
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>>8603142
>MIT PhD
>Los Alamos government research
Anonymous
/sqt/ - Stupid Question Thread: Sheaves Edition 2017-01-10 04:35:36 Post No.8591198
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/sqt/ - Stupid Question Thread: Sheaves Edition 2017-01-10 04:35:36 Post No.8591198
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/sqt/ - Stupid Question Thread: Sheaves Edition
Anonymous
2017-01-10 04:35:36
Post No. 8591198
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Previous thread: >>8582651
Post all your stupid questions that don't deserve their own thread here.
Starting with an exercise from Hartshorne I need help with:
Let [math] \varphi: F\to G [/math] be a morphism of sheaves. Trying to show the equality [math] (\ker\varphi)_P=\ker(\varphi_P) [/math] of the stalk of the presheaf kernel [math] \ker\varphi [/math] and the kernel of the induced stalk map [math] \varphi_P: F_p \to G_p [/math]. The inclusion [math] (\ker\varphi)_P<\ker(\varphi_P) [/math] is clear to me but not the converse.
If [math] (U,s)\in \ker(\varphi_P) [/math], then [math] \varphi_P((U,s)):=(U,\varphi(U)(s))=(U,0)[/math] implies there exists [math] V\subset U [/math] with [math] \varphi(U)(s)|_V=0 [/math].
But why should [math] \varphi(U)(s) =0 [/math] which is needed for [math] (U,s)\in (\ker\varphi)_P [/math]?
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I think I got it, so [math] \varphi(U)(s)|_V=0 [/math] implies [math] \varphi(V)(s|_V)=0 [/math] by the sheaf morphism condition, so [math] s|_V\in \ker\varphi(V) [/math] which gives [math] (U,s)=(V, s|_V)\in (\ker\varphi)_p [/math].
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>>8591198
Isn't that just a trivial result of the fact sheafification induces an isomorphism of stalks?
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>>8591250
You're probably right but I don't know how to see it
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What's the biggest screw up you've ever done in a lab or seen someone do?
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>>8584517
I farted so hard that the professor and all students needed to leave for a couple of seconds (I was the lab technician)
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>>8584556
Deadly bro
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>>8584517
Sleep well little buggy :'(
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Is it possible to do an Infinite amount of things in a limited amount of time?
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What kind of of fucking retarded question is that.
Get the fuck out of my house.
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Yes, if you can do things arbitrarily fast.
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>>8603582
Think about it
Let's say we divide a minute in a way that the next time is divided is gonna be the half of the last time it was divided(30 secs, then 15 secs, then 7.5 sec...) And every time the clock hits one of those marks, I move an inch, so in one minute how many inches would I move?
/sci/ should be able to solve this
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>>8603361
C 100
$70 of goods, $30 cash
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100 bucks. He loses 70 worth of merchandise, and loses the 30 that he gives in change.
There are harder versions of this OP, and those would be the ones that you'd be looking for to post here (if you actually wanted to get people shitposting at each other). They tend to involve counterfeit currency if you care
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Does anyone remember that cashier scam where you basically ask for change and then suddenly remember you actually have enough change to change the denominations you receive and you make a series of transactions while the cashier has the register open and is confused, and in the end, you make it out with more money?
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Warp-drive is an idea that takes its name from the sci-fi FTL drive from Star Trek. (While we usually call it warp, in reality it is actually referred to as a "space-time bubble." ) The idea is to use a loop-hole in Albert Einstein's theory of relativity, which is that while an object cant travel faster than light, the space around it can be altered so that it "moves." If the space in front of an object is contracted and the space behind it is expanded, theoretically it should be able to change its location in space without ever actually moving. We can say that this isn't impossible because the theory of relativity says that space is dynamic, but the only thing that could possibly move space in such a way is negative energy.
While negative energy is mostly speculative, it's proven that it could do all sorts of wonders: time travel, wormholes, destroy black holes, and create warp fields. The biggest difficulty we have with creating warp-drive (and all these other things) is obtaining or creating enough negative energy. In the case of warp drive, you'd need enough negative energy to create a stable field.
Does /sci/ want to speculate on how to gather, attract, or create negative energy without destroying it? Also general warp-speed thread because it's interesting.
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>>8602979
>time travel, wormholes, destroy black holes, and create warp fields
We won't ever do any of those things without a quantum theory of gravity.
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Also, here's something I found when looking into negative energy, pretty interesting. It came with this:
"Space-time bubble is the closest that modern physics comes to the "warp drive" of science fiction. It can convey a starship at arbitrarily high speeds. Space-time contracts at the front of the bubble, reducing the distance to the destination, and expands at its rear, increasing the distance from the origin (arrows). The ship itself stands still relative to the space immediately around it; crew members do not experience any acceleration. Negative energy (blue) is required on the sides of the bubble."
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>>8602979
dark matter, dark energy
>negative energy
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Is the singularity going to happen?
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>>8602934
what do u even mean by that
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>>8602934
>singularity
HAHAHAHAHAHAHAHAHAHAHAHAHA.....Holy shit...."The Singularity"...BWAHAHAHAHAHAHAHAHAHAHA....Oh man, anon it's right around the corner....HAHAHAHAHAHA....Honest anon.
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Friendly Reminder to abandon Academia and obtaining a STEM degree in favour of self-eduction.
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>>8602734
whats STEM
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>>8602739
Science, Technology, Engineering and Medicine.
Or as I like to call it: The Big Lie.
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>>8602734
This is a great plan anon. Surely the normies will do this so less competition when looking for work.
How do i make myself smarter /sci/?
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front loading pain
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>>8601684
>Front loading page
I mean like everyday tips or routines.
Im kinda interested
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Dunno, try crosswords.
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Wait, so the Cardinality of the real numbers is 2 to the Aleph null? Was this proved?
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>what is continuum hypothesis?
0/8
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>>8600822
Yes. By me.
Would you like the answer? It would require me to disseminate my source code.
Prior offerings of that have met with resistance. Would you prefer me provide it to you securely?
It requires proof that you are human though.
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>>8600824
I thought that 2^Aleph null was the power set of Aleph Null, why is it also the cardinality of real numbers?
Fight me.
Fuck convergence.
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Well reasoned and thoughtful. I agree completely.
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Truly spectacular.
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>>8600514
Don't be like that famous dumb Indian.
https://plus.maths.org/content/infinity-or-just-112
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>Your score was 29 out of a possible 50.
>Scores in the 26 - 32 range indicate some Autistic traits (Aspergers Syndrome).
Hello brothers
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>>8599334
I've scored 21 on that test.
I'm sure that this is due to me having what I suppose to be covert schizoid personality disorder though. I wish I was able to focus on something as much as autists do, but I am far too easy-going and careless for that.
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38/50 here. I think the only valid method into detecting AS would be actual therapy and not an online test because it mainly has to do with nonverbal traits, not just nuances in emotion and language.
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>>8599334
Where did you take the test?
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Hey /sci/,
I need some help. I need you to tell me how practical the following is.
So I have a lot of passions, economics, physics, computer science, and sports. I want to excel in each department, but obviously it's a difficult task. So I'm planning to divide my week into days for each passion.
Monday = Computer Science/Programming/Machine Learning/Arduino.
Tuesday = Economics/Investing/World News
Wednesday = Political Science/History
Thursday = Mixture of all studies + include some fiction reading etc.
Friday = Physics and Mathematics
Saturday = Play sports outside
Sunday = Do whatever the fuck I'm interested in, for example I need to finish some physics studying or complete a website. This is a wild card day.
In each of these days, I will allocate around 6 hours for the subject matter. Additionally, I will allocate 2 hours for college studies, for the 5 classes I'm taking this semester.
Opinions? How far will I reach in each of the fields if I keep up this routine for, let's say, 10 years? And I have literally 0 social life(by design) so I can concentrate on making myself a better human being.
Thank you brothers.
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You sound young. Watch your passions fall away one by one until eventually you'll be lucky if you have any left. Just give it time. The one will reveal itself to you at some point in the future.
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>>8589058
No "These aren't actually your passions" comments please. I'm not asking if they are my passions or not, but rather if the path I'm taking to follow them is right.
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>>8589034
If it was possible to keep this routine for 10 years you would be an expert in all of them.
But it's not. Energy and motivation is a very limited and valuable asset. If you're like most of us, and not a freak genius with infinite motivation supply, you need to learn more about your potential interests and find one you like a lot.
It's hard to tell, but it sounds like you like computer science the most. People in your position usually claim to like econ/history/political science/fiction just because they're pretentious and fell for that kind of meme, and physics and math for the same reason. Do you know anything about these topics? Where are you right now in your life? Tell us more and I'll try to help.