Archived threads in /sci/ - Science & Math - 2015. page

Undergrad fag here. What does (p, a)^(n)=(p) and that little cross symbol mean in the first question? And why algebraic number theory? Why not analytic? Or are you doing both? And aren't you in your first/second year?

PhD here. What is a "number"?

>>7767643
>what is the little cross symbol
gtfo

She is a beauty, but she do lack curves.

>>7767309
because you don't do taylor series for curve fitting

>>7767309
I thought you could only use taylor to approximate a function only near a certain point..? Can you use it to approximate an entire function? Correct me if I'm wrong /sci/

>>7767107
>"The egg, laid by an animal that was not a chicken"
>- Neil D. Tyson

>>7767107
A chicken just means a chicken. If you wanted to communicate that it is male you would say rooster. For the purpose of the 'paradox' it is assumed that the chicken is a hen.
Anyway the answer is the egg.

>>7767125
Maybe just in the english language. Other languages have a name for the baby and another one for the grown animal.

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>>7764813

I guarantee 90% of the books you faggot post, you haven't even read properly, if at all.

>>7764819
>frogposter
opinion discarded

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>>7764828

>truth hurts, the post.

I'm a lion poster now.

>>7764673
look up hash oil or resin

>>7764673
Have you tried smoking it?

Looks good its shatter made for dabbing

>>7763809
What the fuck is an A-level
I'm finishing my bachelor's in statistics and I'm sure that the probability converges to 1

>>7763822
A level is basically what we take before university.
GCSEs into AS level into A level into Bachelors

>>7763836
Why do Brits think that graduating high school is a great achievement

>>7763370
>Still, the price of solar power is steadily going down and heading for dirt cheap, and battery technology is advancing nicely to complement it.

I think you have neglected an important fact, in that some places it is not very sunny, and that winter exists. Battery technology also isn't really advancing that rapidly, at least not in the areas that are important for grid-scale storage- I'm not sure where you got that impression. (However, development in redox flow batteries is looking very promising for solar as a viable main energy source. Batteries aren't advancing rapidly, but they're undeniably moving towards the world where solar rules the grid.)

While I understand using solar storage as base-load power over the course of days or weeks, I don't know if it's really practical to store enough power to supply energy through months of dark, cloudy upper-latitude winter where energy demands for heating spike.

And while long-distance transmission of power can be very efficient, it would require very expensive infrastructure overhauls to offload all of the world's power generation onto sunny areas and transmit that to places like Seattle. Or Alaska.

Fusion plants, on the other hand, would be far more easily integrated into the grid. Considering all this, I suspect that (assuming commercial fusion ever, you know, actually happens) economics will favor some combination of solar, fusion, and other energy sources (Iceland is going to be geothermal for the rest of time). Fusion may be expensive, but overhauling the grid is REALLY expensive.

That said, all this depends on just how expensive fusion really is. Most current *commercial* fusion approaches have the potential to be relatively cheap, or else those commercial ventures wouldn't be able to afford to work on it. If those don't pay off and it turns out that ITER-but-bigger is really what a fusion plant looks like, certainly fusion will never be competitive.

>>7763370
Public opinion is retarded.

Solar panel manufacture is massively polluting.

Also, has net energy gain over the lifetime of the panels been achieved yet?

Sorry to say but you're a victim of clever marketing and you are about to be dashed upon the jagged rocks of reality.

>>7763403
>Also, has net energy gain over the lifetime of the panels been achieved yet?

Yes, and they have since 2010. In fact, by some estimates, the energy deficit from all the years that solar panels were a net energy loss has already been paid off.

>>7762599
heat isn't caused by anything, it is literally energy
it's rate of transfer is related to the temperature
energy can be transmitted both via momentum transfer when particles collide and light absorption, not just IR light either

>heat is the rapid movement of molecules
>heat is often transferred in the form of infrared light
There ya go.

>>7762603
So heat is entropy in measurement?

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>>7778472
Tfw communism is the best choice but people are greedy

>>7778472
You are right, we need to develop other technology so we can put automated solar panel and hydroponic farm manufacturing robots on mars or something, but this process involves going into space at some point to help figure out which direction to go in.

>>7778472
>So basically the future of space travel and tourism is doomed and completely economically unfeasible several times over unless we discover some kind of “space magic” that is both cheap and efficient to defy the laws of physics...

and that's news to you? kek
thing is, there isnt all that much to do in space. because it's mostly empty.
'asteroid mining' is (for now) a pipedream of people who play too many scifi video games. it's just too impractical and not even remotely profitable.

same for off-planet colonies. aside from research there is nothing they provide that couldnt be done on earth for a fraction of the cost.

establishing a small research base on the moon, and maybe even on mars, is feasible. would take a LOT of time to plan and execute, but it is feasible.

actual 'colonization' of other planets though? WAY beyond our capabilities. would require so much shit we have absolutely no way of getting on the moon (or mars), and even if we had, they'd still be far from self-sufficient (which is kind of required for an actual human settlement to thrive)

>>7778488
>if only humans werent humans, then my utopian societal models could finally work!

It's just a fractal bro. Nature replicating a pattern which also exists in some way on a smaller scale.

If you think the universe is a brain then you're on the wrong board.

one of them is a braincell, other is the universe
there :^)

There's nothing to explain.

>>7778849
at least he was a genius. i'm just virgin and stupid

>implying he wasn't homosex

>>7778849
bad, because I'm not a virgin anymore

That depends on your definition of successful.

>>7778075
what the fuck is that?

>jesus christ OP, you ask a question about something without even fucking identifying it? You are the worst poster ever, and should go back to poster school.

>>7778086
It's in the gif title. It's colloquially known as the water bear and it's the hardest to kill organism in the world.

It can just go "fuck this" and sit dormant for periods of time usually preserved for seeds lost in glaciers.

>>7776028

Physics aren't that hard mate.

>>7776031
it's just equations and memorising, ffs

>>7776028
I guess that's why he had to settle for physics. In math he would have failed.

he's in his own category

>>7775321
What would that be?

>>7775325
I'm pretty sure he contributed to string theory

>>7774264
As if anyone needs a scientific excuse to say "only virgins are marriage material".

Not a biofag, but if sperm cells persisted in offspring they could theoretically impregnate the virgin daughter

>CHRISTIANITY DEBUNKED!

>>7774269
They're saying the genetic information persists, not the sperm cells.

There's been studies showing epigenetic changes in females after sperm cells burrowed into their wombs too.