Archived threads in /sci/ - Science & Math - 1047. page

>>8563423
Honestly, this is one of those projects that gets praised by people because it looks impressive, not because it was actually useful to them.

Knuth set out to write a little book on how to write compilers, but his hopeless pedantry took over, and he turned the first chapter into a textbook on a rather arbitrary selection of background mathematics and the second into a textbook on elementary assembly language programming for an imaginary computer.

If you skim them, you'll probably pick up a thing here or there, but it's not comprehensive, as it's claimed to be, or timeless. It's certainly not suitable as a general textbook to study or teach courses from.

Knuth has some very odd ideas about where you should be focusing your attention. Bear in mind that this is a guy who set out to write a useful little book in his youth, let it spiral out of control, and now is going to die with it perhaps half-finished. As a working programmer, his great claim to fame is writing TeX, which is a page layout language generally considered to be only usable because it was turing complete and therefore LaTeX could be built on top of it (and he had nothing to do with LaTeX, which he doesn't understand the need for).

It's DENSE, and it does seem to be more of a reference work. It's full of excercises though. But, for example, the first volume, about 700 pages long, only discusses linked lists and some other datastructure. Volume 3 discusses sorting and searching. It says right in the preface that he tries to be as comprehensive as possible about the structures he mentions, down to the minutae. The series are not complete either.
You probably shouldn't, unless what you like is to go cavalier on a very dense book full of excercises of varying difficulty. It doesn't teach everything either, it mostly deals with low-level structures and algorithms, and not all of them at that.
It will take you about a year per book.

>>8563870
A year per book, what are you a brainlet?

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>>8562601
>60's - 70's
>Automation spreading as never before.
>Population climbing as never before.
>Put women in the workplace.
>Nearly double the size of the employment pool in less than two decades.
>Unemployment rate goes DOWN.

For every job you automate, you create five more in other sectors.

Until we have a bunch of self-maintaining Commander Datas running about, automation is going to do anything but kill jobs.

Additionally, the more people you have, the cheaper the automation needs to be to make it worth the effort. The less people you have, the less jobs you need. So either way the population is going makes it an uphill battle for automation to create mass unemployment. At best, you can create temporary pockets of unemployment in individual sectors or locales, and the jobs merely move somewhere else and/or into something else. (Though this does have the side effect of creating industrial ghetto wastelands in one place, and dystopian megaworks in another.)

You mean those small asian countries with population deficiencies dont have employment problems?

>>8562613
Literally two Asian countries, neither with overly small populations and then five European countries and one European colony before the next Asian country. What the fuck are you on about?

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>>8561793

You math folks are kinda gay for numbers, aren't you

>>8561802
What determines a numbers sexual orientation?

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>>8561802

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I saw your other thread.

>>8554164
>M
>ruler and 4 arithmetic operations
REEEEEEEEEEEEEEEEE

>>8554168
shut up, stop trying to make me embarrassed

>>8553010
I wish there was a forecast for when they expect results.

>>8553010
>Such an engine would violate the law of conservation of momentum by generating mechanical action without exchanging matter
stop posting stupid shit

>>8553047

Looks like you have to rewrite your textbooks, sonny.

Reality doesn't care.

>>8564580
Godel's Incompleteness theorem implies the universe acts in such a way to maximize entropy, which can be achieved by drawing mass towards mass

>>8564588

Top tier shitpost, but you forgot that the heisenberg uncertainty principle implies that Godel's theorem is itself uncertain, so your argument is in a superposition of right and wrong.

>>8564588
So much like testicles drawn towards your body while it's cold?

>>8564159
Dunno m8, but Dimethyloamine would be pretty weak nucleophile and so strong electrophile would be needed. Sadly for you 4-Iodinebutanal is also pretty weak electrophile, its transition state would be horribly unstable. So from looking at it, SN2 is not likely since your nucleophile is weak and SN1 is unlikely since 4-Iodinebutanal is primary and so cannot form stable cation. Try reading something about SN1/2 reactions on this website: http://www.masterorganicchemistry.com/2012/08/08/comparing-the-sn1-and-sn2-reactions/

I don't think that elemental iodine would halogenate an aldehyde. Especially at the 4 position in butanal.

>>8564167
>>8564169
well I used iodine just because it has a solid form I forgot to include that for me it doesn't have to be iodine it could be any other halogen

>actuarial science
>science
Sorry, this is a lie.

>>8562922
It involves math, you brainlet, you're just mad because they pull in way more than your (((((((physics teacher)))))))) salary.

>>8562928
Just because a field uses math does not make it a science.

Would you consider Accounting a science? Because actuarial science is about as scientific as accounting, it just uses calculus and probability in addition to basic algebra.

I mean, sure, you make plenty of money, and you can earn more money faster by studying and passing more tests so if that's the part of school you're good at it might work for you. But you need to come to terms with the fact that you are essentially making statistical models based on data as part of a highly bureaucratized corporate business process, and will never do anything even tangentially related to mathematical research, science, or really anything in the physical world. At least engineers are making something.

>>8561477
Yes, but a poor one.
It dissipates the proton gradient by converting it to heat.
Don't remember exactly how it works, but it's one of the following:
-blocks some ETC component, therefore no proton transfer across membrane
-binds to a channel, which opens and allows protons to pass through with lower delta G than ATP synthase, dissipating the gradient

Doesn't ammonia just diffuse through the inner membrane and then cause uncoupling through close enough dissociation constant, like Dinitrophenol?

Small shit gets through lipid bilayers and can transport protons that way.

>>8562606
Basically this, molecules like ammonium and dinitrophenol have an unequal distribution of electrons and therefore are able to disrupt the proton gradient and cause the protons to become heat rather than energy

Strange times when people don't trust the government en mass

>>8564645
>She won't vaccinate her kids and I'm kind of concerned about what will happen if they get sick.
If she's uncucked enough to breast-feed her children, they don't even need vaccines since breast milk contains antibodies (people who write vaccination laws don't give a shit about this fact though so up to a certain age her children might have to be home-schooled depending on the law in your country).
Also, food for thoughts: tetanus does not immunize, yet according to vaccinefags, tetanus vaccine immunizes against it by injecting false tetanic bacteria. rally makes u think

When did people who have not studied a subject for longer than five minutes in their whole lives start to believe that their opinions are just as valid as those of people who have studied that subject for a lifetime?

This represents ia massive failure of the education system in this country.

I also blame our national mythos of equality and dumbening entertainment in all its forms.

>>8564494
>>8564494

The math didn't work, so they just thought "what would the world have to look like, for us to be getting the kinds of errors the math keeps spitting out?" Whether there's any reality behind the model used only time will tell, but string theory deals with such tiny scales that we're centuries away from being able to test its predictions empirically.

>>8564504
There's much assumption in the Theory, you reckon we'll ever be able to rigorously run a test on it?

>>8564567

Sure, in theory. The energies involved are way beyond our current technology, you'd need a particle accelerator a lightyear across using current tech to reach the Unification Energy, but ultimately this is "just" an engineering problem. The theory DOES make predictions that can be tested, but the extreme difficulty involved in doing so means there's no way to know whether or not the theory is sound. On the other hand, there are some seriously big brains behind it, and Susskind says there have already been applications in theoretical physics from ideas developed in string theory, such as the ER = EPR interpretation.
https://en.wikipedia.org/wiki/ER%3DEPR

i feel about the same as when i hear people who believe the earth is flat, that the moon landing was a hoax, and that climate change is real

>>8564483
That's actually true, though.

t. genetics grad student.

>>8564490
Genes play no part in creating the physical differences between races?
Blacks have black skin and broad nostrils because society forces them to?

if you only have one subscription, make it to the top journal for your field, something like Science or Nature or whatever the equivalent for PE is

>>8564241
i subscribe to mostly industry journals which are free.

Turbomachinery International is a favorite.

>tfw pay to get old nature releases

Pick the big ones, OP.

It isn't the same though. You can't visualize QM. Think about it--your smart. How would that work?

>>8564160
The man who knew infinity

>>8564160
>interstellar
>based on relativity
Just go to a technical school senpai, STEM is not for you

Looks like just a massive chalcopyrite ore. Nothing of interest. Where was this specimen found?

>>8564017
ur mom xD

>>8564017
>Nothing of interest.

Quiet Schlomo. OP, you have a rare piece of uranium oxide whose purity appears to be pushing the 30-35% range. These aren't unheard of in nature, but they typically don't occur on the surface. By the way, you're probably fine if you only handle it for a few seconds, but you should obviously wash your hands and store that thing in a thick metal container of some kind. I'd say a box of 1/4" steel plate will be adequate.