/sci/ - Science & Math

Books. Use books. Sooner or later you'll have to. Websites usually are low-level, or unconnected information, or ... well, books.

I just realized I can't tell ATLAS apart from CMS. My guess would be ATLAS.

It's singular (i.e. det=0). Pic related.

This makes me think of the "shut up tripfag" argument often encountered here.
(Yes, go ahead, it's funny, somebody post it.)

It's the result of a huge calculation. Problem is, in cosmology you can't perform experiments since it's quite hard to create a universe in the lab.
However, what you can do is program one. Start a big bang using certain parameters, then see what comes out a few billion years later. If the result has structural differences to our known universe, start over with different parameters. For example, in our universe, matter isn't distributed evenly, i.e. there are huge parts without matter while in other parts lots of galaxies are clustered together. So, if a homogeneous mass distribution universe comes out, repeat everything.

>>2364745
I was just stunned. I mean I feel like it's a weird grading system, but ... I mean there's got to be some justification. What's a 4.0 then? Is it not "aced the tests" but something else? "Is in the top 25 %"?

>>2364543
Well that chart is specific for my physics department, no idea how the general rules are (... or if there are any after all).

>Seeing as how Germany doesn't have that many good universities (top 20)
We also don't have bottom 20 universities, mainly because nobody is keen on university penis comparison here. Do good research and you will recieve credit for it, haven't heard a single one talking about which German university is the best so far.
For example, I'm in a room with Ansgar Denner twice a week, a world-known feynman graph supercalculator machine (4th order etc), and another prof has written the de-facto standard LaTeX package for Feynman diagrams - and yet nobody bitches how great we all are here. (And if someone wore a university uniform here he would be laughed at collectively.)

Excuse me!? 2.0 is one of the nicer grades, but it translates to a GPA of 4.0? What the heck. It's like everyone has a 4.0 then.

1. The unit of <span class="math">\hbar[/spoiler], c, <span class="math">k_B[/spoiler], <span class="math">\varepsilon_0[/spoiler] and maybe G.

>>2363040
Trains are classical objects, and Heisenberg doesn't apply to those. The problems start occuring only if you assume the train is very small, and in fact not localized but a probability amplitude.

Time dilatation occurs on every moving object, but the effect is very small when well below the speed of light. The formula you're looking for is <span class="math">t = \tau \frac1{\sqrt{1-\frac{v^2}{c^2}}}[/spoiler]. The weird factor in the end accounts for time time dilatation, i.e. how much longer time appears on a moving object. Evaluate this term for small v, i.e. in the order of magnitude of kilometers per second. You'll find out that even at those high speeds in common language, it's still almost one. Now try plugging in c/10, c/2, ... and see what happens.

That's an equation. Nothing to understand about it.

You can't be a translator the week after you've started learning a language. And you can't start with category theory.

At some point you start seeing connections. You'll always encounter PDEs in other parts of math, it's not about application per se.

>>2359729
Books. Haven't used an English one though, so you ask some anons what they recommend. On first looks, Spivak looked pretty basic.

a) That's not calculus
b) That's a first year question that anyone can answer who's seen how to project anything on anything else
c) You're not ashame enough if you dare asking (even anonymously) such a question in public, provided that you're several year past calculus (sure)

>I'm several classes past first year calculus
Yeah.

>>2359684
Finally somebody mentions it again! haha

>>2358217
Plus Hessian determinant.

I think we've been using it in physics a few times.

>>2358175
Mathematica has a free 15-day trial, just write bullshit in the request form and use 10minutemail.com.
As for the serial, well, you'll have to uuugh (post ends here for legal issues)

>For those majoring in physics, what's it like?
Pain. But sometimes rewarding. Mostly pain though.

>Is it soul-crushingly difficult?
Nope.

>Do you have to be a genius or is hard work and determination all you need?
Not being stupid helps.

>Is it possible to have a social life?
Yes, but there are drawbacks. When your machine says "measure tonight" then you measure tonight.

>What are your fellow students and professors like?
Nice. There are few hardcore nerds, and I get along with most of my colleagues. (And the hardcore nerds are nice to me. Yipee)

>>2358103 Mathematica
This.

>>2357661
Hilbert was pretty close to discovering relativity himself. I think with the progress of differential geometry it was just a matter of time until somebody went from global Lorentz invariance (SR) to local (GR).
That's not to discredit Einstein's discovery, but I think if he wouldn't have done it, somebody else would. Maybe a few years/decades later though.