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Archived threads in /sci/ - Science & Math - 1021. page

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I'm learning quantum mechanics and there's one thing I don't understand. I hope /sci/ can help me.

tl;dr: What exactly is causing the collapse of the wave function?

In my uderstanding there are all kinds of interactions. When two or more particles interact, their wave functions become somehow related but still remain uncollapsed. But a "measurement" instantaneously projects the wave function in some eigenspace. I guess my question can be rephrased: Which kinds of interactions constitute "measurements" and which don't? For what reason?
25 posts and 4 images submitted.
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Have you tried resetting the router?
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>>8575734
measuring=transferring the information
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>>8575734
>What exactly is causing the collapse of the wave function?

Nobody knows. You take a measurement and then wave function collapses to a definite state, what causes that to happen, no one knows.

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So has anyone here read this shit? Most of it I'm OK with but then when he starts going on about "Imaginary time" and all that jazz I lost it. I don't get it.

About a quarter of the book I didn't understand. I was reading the words but without any comprehension of what it meant.

I'm I just stupid?
9 posts and 1 images submitted.
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>>8579460
>reading popsci

Stop.
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>>8579460
Considering this is a popsci book aimed at the layman? Yes, yes you are; I own a copy of this as a coffee table book for normies when they come to visit.
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>>8579474
>for normies when they come to visit.

Have they though?

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So I spill a drop of water in the table
1 hour later it is completely gone


Where did it go? I know it "evaporated" but what exactly happened? I thought water has to boil to turn into the air
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>>8579213
The breaking of hydrogen bonds between the water molecules on your desk have a negative heat of reaction, meaning you dont have to input any energy into the system in order to break those hydrogen bonds.
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>>8579213
It's humidity. It didn't truly "evaporated", however it spread so thin it lost of mass and can be carried by air.

It's the cause of mist, by the way. True vapour is invisible to the naked eye ; the smoke you see when you cook your pasta is just 100°C water coming into contact with air, cooling a bit, becoming a liquid again, but again spread so thin it can be carried by air.
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>>8579217
however adding heat to the system would increase the rate of hydrogen bonds breaking

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Hey there /sci/! I'm a Software Engineering major but in the future I'd like to get my post-grad in Neuroscience. The more I learn about it in my free time the more designing software systems seems asinine. Anyway some of the discussion here really interests me and I was wondering if any anons would be willing to pick apart a personal paper I wrote a year ago in my spare time. It has to do with Consciousness. I have tried to apply some of my studies in biopsychology and philosophy to my argument and attempt to take a stab at defining what consciousness is exactly.

Please ask questions, pick apart my reasoning, and critique! I want to improve my theories and ideas and the only way to do that is through discussion! :)
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Throughout history people have tried to explain the physical process of a conscious mind. Most popular theories include the idea of a “soul” or some unknown, possibly incomprehensible, part of the mind that we could never understand. However it seems to me that the idea of the conscious mind and the idea of consciousness could be described in physiological terms.

I) The first step to answering this question is to look at the other minds around us. Animal minds, and how those minds react to their environment differently or similarly than our own. Since we ourselves are animals we can study more primitive animal minds to understand where the root of consciousness may lie. If one were to observe a bird one might notice a few interesting traits, the first of which is a rudimentary emotional intelligence. Birds seem to have the ability to have their feelings hurt (as do some other animals, such as dogs). A great personal example of this comes from a trip I took once, in which I had to leave my pet parakeet home with a sitter. Upon returning I noticed two significant responses to my absence: Primarily he was excited for my return. Whether that is because he wanted out of his cage to stretch or because he wanted to be around me personally is unknown, however he had another very interesting response that makes me lean toward the latter. He was angry at me for leaving him for so long! Normally he would sit on my shoulder, allow me to pet him, and want to play with me. But upon my return he wanted nothing to do with me and even snapped his beak at me when I tried touching him! What we can gather from this small experience is that animals, birds in this case, seem to have a very rudimentary form of emotional response to their environment. This response seems to give the impression of a personality, a trait that we commonly associate with consciousness/the human mind.
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>>8579129
Another interesting tidbit about birds, they also seem to have moderately strong communicative abilities. That is, they possess the ability to share their thoughts or feelings with others. This has again been proven to me through interactions with my pet bird. I noticed some time ago that when my bird’s food dish was out he would become increasingly persistent in staying in my line of sight. Upon noticing I had seen him or that I was giving him some sort of attention, he would open his beak wide and stare at me. This was/is his signal to me that he is hungry and wants to eat. This sequence of events made me aware of two facts: 1) Birds, to a limited extent, understand that other animals think and use that understanding to their advantage. They can share what they are feeling to other creatures and get a result, and they understand that in a primitive way. 2) The language center of the brain must have some connection to the idea of consciousness as we know it. That is, because I can empathize with the bird and he with me there has to be some sort of forethought taking place on either or both sides. This forethought must be something along the lines of “I am hungry, how can I let the one who feeds me know I am hungry?”. I believe that two significant parts of the brain relating to consciousness are the emotional and language areas of the brain.
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>>8579132
II) Now we delve into the human mind. We can basically break consciousness into two categories, things felt and things thought. Or rather emotional and analytical. Things that are thought in terms of words come from the conscious stimulation of different areas of the language centers. Things thoughts in terms of empathy and feelings come from the emotional areas of the brain. The ability to think, I believe, can be boiled down (as said before) mostly to the language and emotional centers of the brain. Since consciousness is simply the stitching together of many different thought tangents, I have concluded the following: Consciousness is the brain’s ability to orderly stimulate different parts of the brain through emotions, language, or both. When an individual is asleep he is considered “unconscious” because the brain stimulates itself seemingly randomly (no order, not conscious). Consciousness may mean different things for different species, for us it primarily relies on emotion and language. Your “internal monologue” is the activation of the language parts of the brain. Basically, you talk to yourself when you think. Your empathy and feelings come from emotional parts of the brain, which can then be stitched together to either include the words your internal monologue are saying, or allow you to just feel things, that is, to not have specific words in mind but to just have general ideas of what you want. Typically though both of these areas have a very large role in piecing together the person you consider you. Other areas of the brain that do not deal with sensory input (such as the prefrontal cortex and other decision making parts of the brain) may play some role in increased cognition, but it is unlikely that they are quite as significant when discussing human consciousness as many animals possess some sort of basic problem solving ability (dolphins, octopi, ravens).

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Or is it bullshit.
12 posts and 1 images submitted.
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Don't know but what's true is that if you touch your dick when you fap, you're gay. That's why I have my own techniques.
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>>8579125
Go on
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>>8579131
>>8579125
How about the good ol' dutch rudder?

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Is there any good book that discuss the randomness and uncertainty in science ?
6 posts and 1 images submitted.
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Taylor - Error Analysis
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>>8579047
http://4chan-science.wikia.com/wiki/Universal_Material#Error_Analysis
http://www-library.desy.de/preparch/books/vstatmp_engl.pdf
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Universe is fully deterministic. You don't understand anything if you really believe in such infantile concepts such as 'random' and 'finite'.

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Convince me to study material that isn't related to the classes I'm taking.
11 posts and 1 images submitted.
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Study material that you think would be useful to the career you are pursing that isn't related to the classes you are taking. Also study material which will help you navigate better through day to day life outside of work.
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Why would I? Crack a beer, lay back, senpai.
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>>8579012
>tfw STEM major but still forced to take women studies

When will the sjws be stopped, lads?

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Probability question:

There is a slight disagreement on /pol/ I was wondering if you could help us with - If the occurrence rate of autism is 1.1 percent, according to autism.org.uk, then what is the chance of having 4 autistic children?

Both if she only has 4 children or if she has more.
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This is the image the person in the OP image was replying to on twitter by the way
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>>8578866
That my be the autism rate for the entire population, but this woman could be a genetic carrier, meaning she has a much higher probability of having an autistic child.
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>>8578866
>>8578871
Nevertheless she's probably bullshitting or misdiagnosing her kids, seems everyone is on the spectrum these days.

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What is the most average thing that exists?
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>Average
>Isn't in the middle of the scale
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I like this subtle b8. Well done OP.
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>>8577956
your shitpost

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Do grades really define intelligence? I've met some really originally thinking people who have failed at the academy. Some of them are not by any means usable in commercial situation, but graded at hands-on experiments, they out-number anyone you can recall.

And I'm not talking about chef's, or anyone with particular hands-on experience on things, I'm talking about who are genuinely interested in physics.

How will you academic faggots challenge that? These people fluent, hunger in math?

Please, tell me.
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>>8577745

Well, this is what will happen:

>entry-level positions

The guy with the grades and the verifiable research experience gets the job.

>in the future

The guy who is better at what he does gets the job.

It's that simple.
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>>8577745
Between the periods of:
>Primary school to secondary school, not really, they only test memory and they normally only teach to pass tests, rather than to become 'educated'.
>After secondary school, into college and A-levels it becomes a test of knowledge and application. And is therefore somewhat more worthy, however, many of them only teach, once more, to pass tests.
>It isn't until undergraduate university in which innovation, application and knowledge are tested; this is the triad of genius.
>Yet, it isn't until graduate where innovation is truly tested.

American translation:
>Elementary school to junior high school, not really, they only test memory and they normally only teach to pass tests, rather than to become 'educated'.
>After junior high school, into senior high school it becomes a test of knowledge and application. And is therefore somewhat more worthy, however, many of them only teach, once more, to pass tests.
>It isn't until undergraduate college in which innovation, application and knowledge are tested; this is the triad of genius.
>Yet, it isn't until graduate where innovation is truly tested.

Therefore, we can concluded the answer is:
Somewhat, however, it is dependant upon the period of schooling in which those grades are taken.
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>>8577745
Grades measure two things: Intelligence and dedication.

That said, having an outstanding intelligence or dedication and offset the need for the other quality when it comes for grades.

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hey guys i hope that we can compile a comprehensive crowd-sourced logically ordered semi-historically accurate list of books in mathematics for undergrad and grad students

any help will be appreciated
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Am working on a list ATM. Its gonna be huge.
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>fields
i don't know why but i laughed
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>>8578084
can you share what you have done ?

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the null point, the real number line, the complex plane, ...
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>>8577209
the imaginary number
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the end of the sequence
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whatever space quaternions make

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All the good math related jobs are in statistics right?

Actuary
Data science
Statistician
Machine learning
Economist
Etc...

Why are there so few stats ppl on sci?
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statistics is too hard and i don't like it
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>>8574769
>Why are there so few stats ppl on sci?
because there aren't many stats ppl in general
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I'm a stats person and I'm on /sci/.

where did the american education system fail so horrendously?

is social media actively making people less intelligent, or is it just giving the ever-present stupid majority a voice?
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>>8574682
14 obviously, and I'm a brainlet, and OP is right.
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It's 10
One full square equals 1
One square with an uncomplete lower right corner equals 2
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>>8574688
>>8574692
>4 cubes is 5
>1 cube is thus 1.25
>9 cubes is 9*1.25 = 11.25

how fucking stupid are you?

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I was always wondering why all these star freaks obsess over the cosmos.

What is so interesting about space?
At best its a meaningless expanse full of dead rocks and deadly dangers.

Deadly radiation from stars, pulsars and other galactic crap.
Gigantic gravity well of meaninglessness like gas giants and black holes.
Dead rock and chemicals some so cold they kill everything others so hot they burn everything to death.

The universe seams to be a insignificant expanse and the human experience seams far to incredible to waste it over watching pointless chemicals and rocks.

What is there to gain in the universe?
At best you will see a planet with a different collaring do to some chemicals.

What is so interesting about it? You can get the same by simply putting some colored glasses and fiction (films, comics) have provided far more interesting vistas to see.

What is so interesting about it?

Human thought is far more interesting, so what if the universe is infinite? its insignificant compared to humanity, a meaningless emptiness.

All these space freaks who tell people how insignificant they are and how they need to bow down to this cold universe is stupid. It breeds nothing more then self created depression patients.


PS: Don't start with alien civilizations we all know the chance of even bacteria forming are so astronomical that we can assume with 99% certainty that we are the only intelligent life in the universe.

I did the drake equation, without pre-baking my numbers I got the result 1.
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>What is so interesting about space?

The possibility of a non-dead rocks of bearable temperate and without deadly radiation.
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>>8569258
>the possibility of a non-dead rocks of bearable temperate and without deadly radiation.
Yet most of it is:
https://www.youtube.com/watch?v=phiJLBM5AQI

https://www.youtube.com/watch?v=lHSAA4WdfkA

https://www.youtube.com/watch?v=M5vj8ziU5iQ

And the space freak tells you
>wow is this not great?
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Earth is too small for human curiosity.

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