Archived threads in /sci/ - Science & Math - 495. page
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>tfw correcting the textbook author
>>7762054
I'd correct Karen's textbook, if you know what I mean.
>>7762070
No I don't.
>>7762075
It means to have sex with Karen, if you know what I mean.
![176921[1].jpg](https://i.imgur.com/1fFDgD5.jpg "176921[1].jpg")
What's the more likely key to eternal life?
Biotech or engineering?
My dick.
Literally.
Biotech obviously.
Self-replicating nanobot swarm with mind upload.
I'm getting into formal and rigorous mathematics and I'm looking for a book on proofs, axiomatic systems, and set theory. My only exposure to axiomatic systems proper was in a rigoros euclidean geometry book, and set theory was breifly explained in baby rudin, but I'm looking for a book that deals more thorougly with these subjects.
Pic is what I've been looking at, but I'm not sure if it's any good.
Also as a sidenote, am I correct in my understanding that "axiomatic system" is basically what we mean when we say "rigour"...
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>>7761844
A (the only comprehensive afaik) contemporary overview on introductory literature to your matters is
http://www.logicmatters.net/resources/pdfs/TeachYourselfLogic2016.pdf
A 100 page overview, including reviews/comments on the classic books.
>am I correct in my understanding that "axiomatic system" is basically what we mean when we say "rigor" in mathematics?
...yeah
>Is there a major difference to the systems [...]...
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>>7761862
ad: I've seen he's since removed the Appendix from that pdf, here are the other links:
http://www.logicmatters.net/tyl/
>>7761862
That's a really nice text, anon.
So should I try to look into books on set theory and logic separately? I noticed the text does give a number of example works, if I go through the text and read through the books recommended (As well as maybe reading an intro to proofs book), would I be well prepared for the more rigorous parts of mathematics?
Can any geologybros help me identify this rock? I'm only a first year so I don't know shit.
It has well-defined layers that go all the way through and it's partially coated in what I think is bitumen (or whatever it is they stick roads together with) and I found it on the way into a field that had been surfaced with broken chunks of tarmac. There were other similar rocks nearby.
I gave it a few whacks with my hammer and the rock didn't break and sparked once. The fracture looks vaguely conchoidal but without the arcs you'd see on flint. Couple...
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Is it hard?
Pic of a fractured surface (scale is millimeters)
So today I learned that americucks weren't learning about pic related until their master because it was "too hard to understand". Is it why engineering is seen as a fedora-tier education in the US?
Is any others cultural difference is science teachings? I find it pretty interresting 2bh. Sorry for the memes btw
>>7761756
engineering is fedora-tier education everywhere in the world
>>7761758
What is Ecole Normale Superieure?
https://en.wikipedia.org/wiki/Classe_pr%C3%A9paratoire_aux_grandes_%C3%A9coles
Engineering isn't a joke where I live, if you think so you'd better compare the number of Fields medals France got with the score of the rest of the world.
Though I think that US students learn more about computer science and industrial science so that could be where the memes come from
>>7761756
I never learned it until I took Stat. Mech.
If some massive interstellar space opera Society existed in our galaxy would we of definitely observe them by now? Assuming there was no sort of attempted to hide nor contact backwards planets we would see saying stuff like old radio singles wouldn't we?
>>7761712
>would we of definitely observe them by now?
We could only answer this question accurately if we had experience with galactic societies.
You're asking a question we don't have enough real-world experience to answer.
>Assuming there was no sort of attempted to hide
Perfect example. Why would you assume this?
>>7761712
>see saying stuff like old radio singles...
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>>7761723
Yeah that, because if they were years ahead of us they probably would have developed TV one stage in the history if they eventually built starships wouldn't they? But the image of near by aliens watching 50 sitcom is unlikely then?
>>7761727
I hope they like fresh prince as much as we do.
Explain this shit
>>7761695
Not 100% sure, but the water around the cup will never get above 212F (boiling point of water). Maybe they are saying that the water in the cup can shed it's heat out the top of the cup faster than heat from the boiling water can enter through the non-zero resistance of the walls of the cup?
>>7761699
>212F (boiling point of water).
the boiling point of water is 100 degree celsius.
Not sure if thats true but as soon as water reaches the boiling point(depending on airpressure) at 100°C, it wont become hotter. it will stay at 100°C. The cup keeps the temperature of the water in it always slightly below 100°C.
Can someone explain me, why a machine like the one in the picture does not work?
I know the law that energy can not be created, please dont tell me that. Science isnt about following rules, it is about finding new ones, right?
Even if these machines dont work, they should work for a limited amount of time right? Why not? It is powered by gravity, which is seemingly some kind of infinite force(i somehow know that that probably is not correct, sorry for my lack of knowledge).
If we connect it with a generator, people say that the its resistance will stop the machine....
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Friction and air resistance
>>7761666
but it does work. just not forever but if we scale it up for a couple of years maybe?
>>7761668
yea sure, what's your point?
Anyone here do A-levels?
>>7761636
Doing OCR Chemistry (old version) in one go
Exams in May/June
That's Krebs up there, ye
>>7761636
Kek A levels are now fucked up shit.
The funny thing is it's all the humanities' fault for being shit and having too much coursework.
They have removed pretty much all coursework now, even the tiny 10-15% you had in hard sciences that were actually really useful for universities to work out which chucklefucks has no common sense.
Now you have to sit AS exams that don't even contribute to the final mark, so then the final A2 exams can ask you ANYTHING from both years syllabuses.
Good...
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>>7761636
absolutely massacred my alevels when I did them
A*A*ABb
the A*s were in maths and fmaths
Hey /sci/ is it possible to procure rocket fuel and rocket part in order to make a DIY rocket and somehow launch it?I know it sound pretty stretched and almost impossible...but i really wanna try it.....{main reason:i fear humanity will collapse soon and the only option is to leave Earth and somehow lock in Earth's orbit}
>>7761542
There are model rockets that use small SRBs. Good luck obtaining rocket fuel and building engines. You basically need to be Elon Musk
>>7761550
I'll think about SRB's as for the rocket fuel i found a place where they sell the stuff....anyways the problem isn't the fuel or engines problem is trying to get it past earth's gravitational pull i don't know what material is best for the construction of the rocket...
>>7761553
Rocket fuel isn't that hard, even plain kerosene will work. Oxidizer is the fun part though.
SRB-based amateur rocketry is closely related to firework making, and these can reach pretty good altitudes. You'll find a plenty of recipes for powder-based rockets using saltpeter as oxidizer and various fuels like charcoal, aluminium oxide, sulfur, and many others. It's a pretty common hobby.
Now if you want liquid-fuel rockets, things get more tricky. Best if you could get access to a cryocooler...
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Does anyone here know what the minimum amount of sleep I need in 24 hour day to function?
I'm tired of wasting my time sleeping.
Depends on what drugs you are on. I recommend amphetamine.
>>7761516
I'm not on any drugs other than caffeine.
I just want to take a like 4 hour power nap and be on with my business
>>7761521
As I said, amphetamine is probably your safest bet.
Why does /sci/ lose its mind over psychology?
I was considering either biochem or molecular biology as my major, but in Australia psychology actually has job prospects. I can't even find job listings for biochem/molecular related jobs, but there are multiple listed in my city each day for psychologists.
So what's with this meme?
It's a pseudo science.
If you'd like to discuss psychology do so on >>>/trash/
>>7761480
stupid meme
stupid memeposter
That original album cover was disturbing for some reason
Does this simplify further?
Yes.
>>7761421
Is that denominator: [eqn] \ln (2) \left ( 2^{2y_n} + x 2^{y_n} \right ) [/eqn] or [eqn] \ln \left ( 2 \left ( 2^{2y_n} + 2^{y_n} \right ) \right ) [/eqn]
>>7761483
Yes
Last four elements of the seventh row have now been discovered. Do we get to blow more things up now?
http://www.msn.com/en-us/news/technology/periodic-tables-seventh-row-finally-filled-as-four-new-elements-are-added/ar-AAgjM5R?li=BBnb7Kz&ocid=HPCDHP
>>7761416
They've been otherwise listed on many periodic tables now, announced by IUPAC or not. Still waiting for naming candidates to step forward before getting hype desu
>>7761416
Nothing revolutionary - as unstable as ever, and quite expectably so. Closing the Period 7 may feel satisfactory but it's not revolutionary. Opening Period 8 will be a greater leap, just one proton away. And three protons away we'll open an entirely new block - the theorized g-block, an entirely new set of elements.
...and then we'll have a long, long way until we get anywhere, with 18 elements of the g-block and 14 of new row of f-block... and supposedly then some schenanigans may begin, like d-block jumping to a new period or such.
Nevertheless, 3 next elements may be somewhat revolutionary, and other than that we need to squeeze 9 more neutrons into Flerovium (E214), producing Fl-298, which is believed to be the nearest shore of the Isle of Stability, and *somewhat* within reach, because the next one will be about 50 protons down the lane.
they're not done yet
pic related
The gravity of a ringworld really confuses me.
How the fuck do you land on this thing? If so, when does the gravity start to effect the ship as you closer to the surface?
Can you even jump on it and still land in the same spot?
Would oceans and the weather ever be somewhat calm?
Are oceans and weather ever somewhat calm?
The force of gravity from the mass of the structure and all its components affects you at any one point in space. The effect of the artificial gravity affects you once you are in the contained system in which you are accelerated to a velocity that allows you to escape the effects of gravity from the mass of the Sun. You can jump on it and land in the same spot because your angular momentum is conserved. I'd assume a good landing strategy would be to enter orbit with the Sun and then slingshot into a velocity that matches the...
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>>7761377
I seem to remember the docking bays being on the outer side of the ring. Don't have to go through the atmosphere that way.
Could a ring structure spin fast enough and generate gravity enough to destroy the star it circles around? Like pulling the star apart?
