Post your favorite formula math and physic (mine is S=k log W)

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Anonymous Sat Jan 24 19:16:32 2015 No.7028969 [Reply] [Original]

Post your favorite formula math and physic
(mine is S=k log W)

>>	Anonymous Sat Jan 24 19:22:39 2015 No.7028978 >>7028969 >not S = -ksum(p_iln(p_i),i) Really?

>>	Anonymous Sat Jan 24 19:24:50 2015 No.7028986 >>7028969 f(x)=O(n•log(n))

>>	Anonymous Sat Jan 24 19:26:47 2015 No.7028992 f(aggot) = OP

>>	Anonymous Sat Jan 24 19:28:08 2015 No.7028997 Barnet's identity

>>	Anonymous Sat Jan 24 19:28:41 2015 No.7029001 Generalized Stokes Theorem yo

>>	Anonymous Sat Jan 24 19:30:34 2015 No.7029009 <span class="math">\cos{\pi}+\sinh{i \pi} = 12 \sum_{n > 0}n[/spoiler]

>>	Anonymous Sat Jan 24 19:33:32 2015 No.7029021 File: 3 KB, 810x57, 4f820d0939928ab4bf06b2921edc1e21.png [View same] [iqdb] [saucenao] [google] >>7028969 mine is inclusion exclusion principle

>>	Anonymous Sat Jan 24 19:42:15 2015 No.7029037 >>7028978 <span class="math">\delta S = 0 [/spoiler]

>>	Anonymous Sat Jan 24 19:48:15 2015 No.7029048 >>7029037 You are missing Lagrange multipliers, bro

>>	Anonymous Sat Jan 24 19:48:40 2015 No.7029049 >>7028969 U=0 Conservation of everything.

>>	Anonymous Sat Jan 24 19:49:09 2015 No.7029051 >>7029048 No I'm not.

>>	Anonymous Sat Jan 24 19:50:56 2015 No.7029053 >>7029051 If you are referring to the entropy, yes you are. You are missing the condition that sum(p_i,i) = 1 and mean value of quantum operators (Hamiltonian, particle number or whatever you want).

>>	Anonymous Sat Jan 24 19:52:07 2015 No.7029055 >>7029053 I should add: unless you are referring to the microcanonical ensemble.

>>	Anonymous Sat Jan 24 19:53:10 2015 No.7029057 >>7028969 P = NP

>>	Anonymous Sat Jan 24 19:54:32 2015 No.7029059 >>7029057 kek

>>	Anonymous Sat Jan 24 19:58:05 2015 No.7029064 >>7028978 fucking physicists using excel pls go

>>	Anonymous Sat Jan 24 19:59:39 2015 No.7029066 >>7029064 I have never used Excel for anything, nor I have it installed. More so, I don't know ANY physicists that use Excel for anything. I just didn't want to write the math tags.

>>	Anonymous Sat Jan 24 20:00:03 2015 No.7029067 >>7029009 pls go

>>	Anonymous Sat Jan 24 20:00:23 2015 No.7029068 >>7029053 <span class="math">S[/spoiler] is action you retard.

>>	Anonymous Sat Jan 24 20:01:25 2015 No.7029069 >>7029066 latex doesn't use parenthesis you closet physicist

>>	Anonymous Sat Jan 24 20:02:59 2015 No.7029070 >>7028969 I know its not what you asked but I am particularly fond of the functional equation T(t+s) = T(t)T(s).

Anonymous Sat Jan 24 20:03:33 2015 No.7029072

>>7029068
Since OP and I both wrote entropy (S too), I thought you were referring to it.

You shouldn't write the variation alone, you should specify respect to what you are making the variation it (could be a field, a metric, coordinates).

>>7029069
So fucking what? I just invented that notation because I thought it was clear. Take the stick out of your ass the next time you post.

>>	Anonymous Sat Jan 24 20:06:42 2015 No.7029076 >>7028969 Euler's Identity. Pretty awesome. Used in so many branches of physics and math.

Anonymous Sat Jan 24 20:07:56 2015 No.7029079

>>7029072
>You shouldn't write the variation alone, you should specify respect to what you are making the variation it (could be a field, a metric, coordinates).
1. Don't tell me what to do
2. I'm not even the guy
3. Everybody knows that fucking equation, how can you even assume it has anything to do with entropy?

>>	Anonymous Sat Jan 24 20:09:23 2015 No.7029080 >>7029079 >Everybody knows that fucking equation, how can you even assume it has anything to do with entropy? Aren't you aware how to find those probabilities in this equation >>7028978 ?

Anonymous Sat Jan 24 20:10:24 2015 No.7029083

>>7029072
How could that notation be clear? The summation index is the last argument of the function. You really must be a physicist since you're so butthurt about this lol. When i was an undergrad all my phy friends used excel or origin, I know a physicist when i see one.

>>	Anonymous Sat Jan 24 20:11:50 2015 No.7029085 >>7029083 How couldn't it? It's pretty obvious which one is the argument and which one the index. All the physicist I know (including undergrad) use either MATLAB or Phyton

>>	Anonymous Sat Jan 24 20:12:51 2015 No.7029086 >>7029085 >Phyton *Python

>>	Anonymous Sat Jan 24 20:16:10 2015 No.7029094 >>7028969 Quadratic Formula

>>	Anonymous Sat Jan 24 20:17:34 2015 No.7029096 File: 10 KB, 242x208, images.jpg [View same] [iqdb] [saucenao] [google] >>7029085 If it's so obvious and this is your own notation why specify the index at all then? Physicist logic...

>>	Anonymous Sat Jan 24 20:18:41 2015 No.7029098 >>7029096 Because I'm not the only one reading it?

>>	Anonymous Sat Jan 24 20:31:31 2015 No.7029122 >>7029098 Then why would you think it was obvious if you're taking newfags into consideration? PHY H Y

>>	Anonymous Sat Jan 24 20:54:38 2015 No.7029159 Y=mX+b

>>	Anonymous Sat Jan 24 21:20:26 2015 No.7029200 >>7029072 > You shouldn't write the variation alone, you should specify respect to what you are making the variation it (could be a field, a metric, coordinates). I've never seen it written any other way. Link to some literature?

>>	Anonymous Sat Jan 24 21:24:43 2015 No.7029211 File: 14 KB, 294x294, 1465959791.jpg [View same] [iqdb] [saucenao] [google] >>7028992 Kek

Anonymous Sat Jan 24 21:30:05 2015 No.7029221

>>7029200
For example, if you have the following action:

<span class="math">S_{M}[\phi ; g_{\mu \nu}] = \int \sqrt{g} d^{4}x L_{M}(\phi,\partial_{\alpha} \phi ; g_{\mu \nu})[/spoiler]

Then, <span class="math">\frac{\delta S_{M}}{\delta \phi}[/spoiler] will give you the motion equations and <span class="math">]\frac{\delta S_{M}}{\delta g^{\mu \nu}} = -\frac{\sqrt{g}}{2} T_{\mu \nu} [/spoiler]. will give you]

>>	Anonymous Sat Jan 24 21:31:25 2015 No.7029225 >>7029221 *and <span class="math">\frac{\delta S_{M}}{\delta g^{\mu \nu}} = -\frac{\sqrt{g}}{2} T_{\mu \nu} [/spoiler]

Anonymous Sat Jan 24 21:42:08 2015 No.7029235
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geneticist intruding on your thread and there's nothing you can do about it.

hamilton's rule

r * B > C

simplest shit ever, applies to the evolution of the genes for all the weird behavioral shenanigans with kin selection

>>	Anonymous Sun Jan 25 02:06:45 2015 No.7029523 Maxwell or bust fegits

>>	Anonymous Sun Jan 25 06:07:59 2015 No.7029723 e=mc vagina

>>	Anonymous Sun Jan 25 06:38:09 2015 No.7029741 Haha nerds I've still yet to master the equation for a line haha

>>	Anonymous Sun Jan 25 10:46:01 2015 No.7029971 >>7029066 >I just didn't want to write the math tags. Didn't want to, or don't know how to?

>>	Anonymous Sun Jan 25 10:47:17 2015 No.7029973 >>7029096 What does this have to do with physics? Autist logic...

>>	Anonymous Sun Jan 25 10:52:44 2015 No.7029981 >>7029971 <span class="math">ur \, a \, fagget[/spoiler]

>>	Anonymous Sun Jan 25 20:32:32 2015 No.7031148 >>7028969 L ∝ m^n

>>	Anonymous Sun Jan 25 22:40:57 2015 No.7031404 Would have to be a classic for me: e^{ix} = cos(x) + isin(x)

>>	Anonymous Sun Jan 25 22:49:38 2015 No.7031416 [-ℏ^2/2m∂^2/(∂x)^2 + V(x)]ψ=[iℏ∂/∂t]ψ Time Independent Schrodinger for a one dimensional particle.

>>	Anonymous Sun Jan 25 22:56:08 2015 No.7031425 >>7031404 When I did the taylor for this and realized what it all meant I came buckets.

>>	Anonymous Sun Jan 25 22:56:41 2015 No.7031427 b^2 - 4ac

>>	Anonymous Sun Jan 25 22:57:30 2015 No.7031430 >>7031416 >time independent >one dimensional top pleb

>>	Anonymous Sun Jan 25 23:01:31 2015 No.7031437 >>7031430 >top undergraduate taking physical chemistry for my nanotech. track in chemical engineering while taking separations and reactor design. Get your hierarchy judgmental piece of trash self out of here.

>>	Anonymous Mon Jan 26 00:12:08 2015 No.7031560 KE=3/2kT

>>	Anonymous Mon Jan 26 00:19:09 2015 No.7031567 >>7031425 'splain

>>	Anonymous Mon Jan 26 00:31:39 2015 No.7031585 <div class="math">(\frac{1}{\tau}=\frac{\delta\sigma}{\delta U})</div>

>>	Anonymous Mon Jan 26 03:18:09 2015 No.7031775 >>7031425 beautiful! although, i never got how the fuck the first guy thought of writing sin, cos and e in power series form. He must have been high as shit!

>>	Anonymous Mon Jan 26 03:26:44 2015 No.7031784 >>7028969 the time dilation formula is incorrect in that picture.

>>	Anonymous Mon Jan 26 04:05:29 2015 No.7031807 S=VT

>>	Anonymous Mon Jan 26 05:14:40 2015 No.7031859 >>7031784 No it isn't.

>>	Anonymous Mon Jan 26 06:06:44 2015 No.7031888 \math \Delta p\Delta x \ge \frac12 \hbar

>>	Anonymous Mon Jan 26 07:16:04 2015 No.7031946 >favorite formula >not e^(pi*i)+1=0 pls

>>	Anonymous Mon Jan 26 08:29:37 2015 No.7031983 Out of those? Time for special relativity.

>>	Anonymous Mon Jan 26 10:02:53 2015 No.7032063 >>7031859 yes it is. It should be T'=T / ((1-(v^2)/(c^2))^(1/2)) they missed a division.

>>	Anonymous Mon Jan 26 10:46:18 2015 No.7032105 I=V/R or J=σE

>>	Anonymous Mon Jan 26 10:51:48 2015 No.7032113 >>7029009 LOL

>>	Anonymous Mon Jan 26 10:57:37 2015 No.7032119 >>7031946 that's an equation, not a formula. hence "equate" = 0.

>>	Anonymous Mon Jan 26 11:17:31 2015 No.7032148 >>7029001 why?

Anonymous Mon Jan 26 11:22:53 2015 No.7032155
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>>7028969
Mine is the standard model of particle physics, if you can count that as one equation. That shit is beautiful as fuck. My life dreams and aspirations is to work on a grand unification theory - one, single, elegant equation. The dream of many brilliant physicists.

>>	Anonymous Mon Jan 26 11:30:32 2015 No.7032170 >>7032155 Which are the varables here? Mass, charge, time..?

>>	Anonymous Mon Jan 26 11:34:33 2015 No.7032180 >>7032155 >beautiful Mathfag here, this is absolutely disgusting, physicists are a bunch of uncultured swine

>>	Anonymous Mon Jan 26 11:35:30 2015 No.7032186 File: 25 KB, 411x384, 1422217805352.jpg [View same] [iqdb] [saucenao] [google] dy = (1/dx)dydx

>>	Anonymous Mon Jan 26 11:41:08 2015 No.7032203 1=1

>>	Anonymous Mon Jan 26 11:45:28 2015 No.7032213 File: 43 KB, 446x456, 1421424516947.jpg [View same] [iqdb] [saucenao] [google] <div class="math">Nat(h^A, h^B) \simeq Hom(B, A)</div>

Anonymous Mon Jan 26 11:54:20 2015 No.7032219
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>>7032155
>grand unification theory
Psst
Don't forget renormalization is a workable form of the vacuum energy density's value which would otherwise be infinite

>the vacuum is empty
>only matter can real
>much "dark" energy

>>	Anonymous Mon Jan 26 11:59:47 2015 No.7032225 >>7032155 It's pretty fucking horrible, mathematically.

>>	Anonymous Mon Jan 26 12:20:23 2015 No.7032258 >>7028992 >fa+2fg+do+ft You dun fugged up.

>>	Anonymous Mon Jan 26 12:33:04 2015 No.7032274 <span class="math">\frac{m^{i \pi}c^{2i \pi}}{11.999...} = -\sum_{k=0}^{\infty} k[/spoiler] aka Barnett-Euler-Einstein(BEE) identity.

>>	Anonymous Mon Jan 26 12:34:56 2015 No.7032275 1 + 1 = 1

>>	Anonymous Mon Jan 26 12:44:42 2015 No.7032292 >>7029072 >doesn't know principle of least action >thinks he can lecture others about it

>>	Anonymous Mon Jan 26 12:46:13 2015 No.7032294 >>7031425 >taylor I came upon it by taking the derivative of cis(x).

>>	Anonymous Mon Jan 26 12:47:40 2015 No.7032296 >>7032294 Die cis scum

>>	Anonymous Mon Jan 26 15:04:14 2015 No.7032509 >>7032274 Remove the - on the right hand side.

>>	Anonymous Mon Jan 26 15:05:50 2015 No.7032513 File: 70 KB, 403x461, 1401306228065.jpg [View same] [iqdb] [saucenao] [google] >>7032509 I believe you are right mister, my mistake.

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/sci/ - Science & Math