Archived threads in /sci/ - Science & Math - 195. page

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Can we get an IP ban on this OP? Like, I don't care what he's saying, but constantly making threads is just retarded and I'm pretty sure violates some sort of board rule. I won't report because I know that counts as "abuse of the report system" if the mods don't agree with me, but this is just ridiculous at this rate.

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>>9092918
This is the first thread I've ever made on this sub

>>9092919
Well there's like three up right now, and they've only seemed to be a thing as of yesterday.

>>9092898
Nope. You're mad

>>9092901
Damn. Well, at least I tried.

>>9092898
What are you even saying ?
What patterns ?
What is your endgame ?

>>9092895
Just get a regular statistics book.

>>9092895

Harvey Motulsky: Intuitive Biostatistics

http://www.intuitivebiostatistics.com/contents/

http://libgen.io/book/index.php?md5=51E6A324E611D0FAAAAB789D2BA916BE

wait what's the actual difference between statistics and biostats?

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>>9092880
A magnetic monopole would have magnetic field lines that only point towards (or away from) the monopole.

Your diagram fails to take into account 3D space.

Now I know you are thinking about doing the same idea only with a sphere of magnets. I'm curious about it too.

https://en.wikipedia.org/wiki/Lorentz_force

F=qE+ vq x B
qE is just the force on the charge q in an electric field E.

vq x B is the force on a moving charge q in the presence of the magnetic field B (note: x is the cross product). This part is analogous to my 3rd link. If v is zero, there is no contribution here.

https://en.wikipedia.org/wiki/Ferromagnetism#Explanation

Shit gets complicated. I think this is where the spherical arrangement might be broken. Internal cancellations and such.

https://en.wikipedia.org/wiki/Electromagnet#Physics

Moving charges create magnetic fields.
Basically, linearly moving charges create a spiraling magnetic field around the line of motion.

It's really hard to visualize adding field lines.
You really need vector calculus, vector valued functions, curl, gradient, divergence.

The gradient of a potential gets you the field.
This works for gravitational potential as well as electric potential.

Yeah I was thinking about the 3D just was difficult to illustrate without complicating things as much and the 2D should give a good idea to begin with, I know there has to be some mathematical approach to show that it doesn't work using Maxwell's equations (Magnetic Flux) but even then I can't seem to find an explanation as to why it happens. Understanding the mathematics behind it would be ideal but at the moment I am just trying to gain an understanding in explaining why this doesn't work without just saying "it just does".

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>>9093032
The mathematical explanation is quite literally "it doesn't". Link:
https://en.wikipedia.org/wiki/Gauss%27s_law_for_magnetism#Integral_form
Let S be a sphere around the center of your construction, and it says that the flux is 0.

I think what "actually happens" is something like the attached picture. When you put magnets together the field strength is a superposition of individual magnets' fields, so it sums to zero.
Obviously the external field is more spread out than internal, so it would only slightly reduce in the middle in the picture. However, if you have infinitely many magnets in a row like pictured, it would sum to zero, and a sphere is more or less an equivalent situation.

>>9092874
If your school offers it, take it if you really want to but make sure you have good grades.

Take a physics class, 100 level. Study had. Get an A. (take it second semester) Get A's or B's in English & everything else. Transfer to a good school and find a mentor professor...etc...

>>9092936
Sorry, study hard!! Late nite, no school tomorrow.

Why is it so hard for toy retarded fucks to use the stulid question threads? Ffs, do you nees to make a whole thread on a problem a highschooler in a shit country can solve?

U substitution

>>9092736
Notice
(x^2 - 4sqrt (x)) / x = x - 4/x^2

And next time ask this in the stupid questions thread you ass

The Universe is a hyper cube desu

The consensis is that it's hypothetically possible but there's no evidence whatsoever that it has ever happened before or that it will happen in the future. Right now it looks like the universe will continue expanding forever and never collapse.

Im pretty drunk right now so don't take my word as gospel. It's was theorised as possible due to some gravitational factor however recent studies show that the universe is set to expand forever. Again I could be completely wrong, hopefully someone more informed will come along and explain in more detail soon

>>9092262
Subatomic particle with a negative charge, duh

the negatively charged part of the atom

>>9092339
yeah, but:

it is a little billiard ball?
it is a wake-like particle?
it is a little field who possesses mass?

videos/MOOCs > books

only brainlets use anything but books

Books. They let you easily go back and forth between pages and you can re-read stuff you didn't understand.

Circle diameter is 2 km

Distance for a complete lap around to your starting spot is 2pi (lets say 6.2km)

You're going 60 km per hour for 10 minutes so you travel 10 km total

the rest is left as an exercise for the reader

That was the hint part...

None of the millennium prize problems could be brute forced by a computer. You're barking up the wrong tree.

>>9092038
Wouldn't the theorem prover be a contribution?

>>9092049
>None of the millennium prize problems could be brute forced by a computer.
Based on the current state of the art sure, but you don't know what kind of related theorems might be known in the future.

>>9091927

No, absolutely not. Use a modern textbook instead.

But if you're still generally curious about Russell you would be perhaps also be better served by reading Russell's Introduction to Mathematical Philosophy, a later text which is not to be confused with the earlier one which you've just cited. Russell explains the ideas in a more conversational prose fashion, after having actually spent time with them. In particular, Russell actually understands what a number is.

>>9091927
nope. it's only important in a historical sense to see what was going to be btfo'd by godel and wittgenstein

>>9092670

Wittgenstein was a mere philosopher, and so with his vagaries had no meaningful part in "blowing the fuck out" of Russell. That work was done decisively by Gödel, who employed the method of a /proof/.

We should also couch Russell's major mathematical works in their right historical periods, for clarity. the text that the OP had referred to, "Principles of Mathematics" (1903) is a quasi-autistic thing which yet comprises a single volume, and is a bit tedious. When it became clear that its ideas would need expansion, Whitehead and Russell joined forced to produce the Principia Mathematica (1910-1913), a three-volume, two-thousand page work of unparalleled and focused autism in the history of the world, outside maybe of whatever it is that computer programmers and web designers do these days which permeate our lives. The second and final edition came out in 1927, with a small list of error corrections and about a hundred pages of appendix-notes. This was the last edition of the Great Meme to have been produced while both men were still alive.

Russell wrote the more useful Introduction to Mathematical Philosophy while imprisoned for his anti-war activities. Russell thus joined a great tradition of significant literary works being written while the author was in prison.

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wikihow my dude

>>9091869
felt the same way after calc 2
calc 1 was interesting and had a bunch of applied applications and so I remember a decent chunk of it thats relevant
calc 2 was nothing but weird ass integrals and I forgot most that crap after the exam
Highly doubt I will ever in nature run into a formula where I'll need to know what the integral of sec^58csc^4 is equal to

>>9091923

that sec 58 csc 4 is probably data points along whatever the fuck the scientist or engineer was studying at a job. he will use numberical methods instead of the dumb trig sub to get the area under the curve

>mod fungus genes so it looks and tastes like banana

Problem solved.

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banananas must evolve or face the consequences of natural selection

if us humans intervene it could have catastrophic consequesnes, like how helping a butterfly out of its cocoon kills it

>>9091783
Humans have already interfered by controlled breeding the Banana until it doesn't have seeds any more and can only "reproduce" by having a human cut off a shoot from the base and replant it. Modern bananas literally can not reproduce at all without human intervention.

How does your criteria fit into any engineering mod? I don't know where you are but in the US a straight math BS or BA degree doesn't get you past a high school teaching position...

>>9091673
>freshman
>pure maths

>>9091673
That's actually a pretty good plan. Job prospects for applied math are pretty good since you can work in either an engineering-related field or something unrelated like meteorology. Applied math + programming skills = wizard status.

>t. mechanical engineer going back to grad school for applied math