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89
help-10
bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 05:12:24
I know there is a conventional way to do this, but i'm really interested in another method: How do you do this task with the lagrangian algorithm? What sidelength does a box with the sidelength of x, y, z and minimal surface have, when the top side doesnt exist? The Volume V0 ist constant. Any help is appreciated 🙂 I know how to do it with 2 variables but it becomes somewhat complicated fast for more than 2? Can i cross out some variables somehow?
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 05:13:42
When i'm trying the determinant version, it obviously is dependant from 3 instead of 2 variables. That way i get the equation 2z^2(x-y) Which leads to z=0 And x=y
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 05:14:25
but this just erases everything in the equation V_0=xyz And z=0 is obviously not a real solution
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 05:28:15
i found this video for it, if anyone is interested. I didnt finish it yet, but i thought someone might be interested
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 05:28:16
https://www.youtube.com/watch?v=nDuS5uQ7-lo
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:04:02
ok i'm still not sure, if i'm able to solve it 😅
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:04:53
the way he does it, he gets some neat solutions for each equation, but that doesnt work for my problem that well. Since the best equation i get is x+y=0
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:04:56
but that cant be]
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:20:26
Wait shouldn't this be "or x=y"
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196,376,941,891,158,000
Arne
4134
Arne
false
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:20:51
yes!
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:21:11
sorry, i'm not used to using the logical and and or operators yet 😄
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:21:20
Which means you can ignore the z=0 part and define z using V_0
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:23:19
the problem is, that V_0 would be dependant on z then
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:23:37
z would be dependent on V_0
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:23:41
Not the other way right
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:23:49
Since V_0 is constant
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:25:17
yep. But if i try to solve for z in this case, i'm not able to separate it from v_0, so that cannot be the solution at that point
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:25:20
Anyway, I'd be helpful if you showed your working
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:25:42
Also you need to realise that the solution might depend on V_0
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:26:19
This guy got solutions as numbers because he doesn't seem to have a constant like V_0
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:42:10
he got the constant 1
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:42:23
which can be treated the same way
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:42:41
i know the solution depends on v_0 but i dont seem to find the lagrangian way 😄
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:43:09
^
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:43:43
Also I'm not sure this implies you knew the solution depended on v_0
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:45:16
ok this is really hard to translate i guess
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:46:07
so... i know the solution is $$\sqrt[3]{2V_0} = x = y, \frac{1}{2}\sqrt[3]{2v_0}$$
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help-10
bac8edccad674791bdf920378e0bee9e
510,789,298,321,096,700
TeXit
01/16/2022 06:47:21
**Arne**
https://cdn.discordapp.c…941891158016.png
196376941891158016.png
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:48:18
That looks plausible
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:48:43
so the x, y, z are dependant on $V_0$. But i got equations like $$\frac{V}{2}+4\sqrt{Vz} = A$$
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:48:56
which doesnt help me at all 😅
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:49:13
Ok which face are you "missing"
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bac8edccad674791bdf920378e0bee9e
510,789,298,321,096,700
TeXit
01/16/2022 06:49:18
**Arne**
https://cdn.discordapp.c…941891158016.png
196376941891158016.png
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:50:18
Constraint: V = xyz Minimise: xy+2yz+2xz
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:50:23
Does that sound right
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:50:25
yup
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:50:38
btw. thanks for your patience with me 😄
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:51:23
So taking the x part: y+2z = lambda*yz
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:51:49
Y part: x+2z = lambda* xz
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:52:30
And z part: 2(x+y) = lambda* xy
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:52:47
yup, i got the same
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:53:20
so lambda can be $\frac{y+2z}{yz}$ and the equivalent for every other equation
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bac8edccad674791bdf920378e0bee9e
510,789,298,321,096,700
TeXit
01/16/2022 06:53:23
**Arne**
https://cdn.discordapp.c…941891158016.png
196376941891158016.png
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:53:43
I'm thinking of manipulating it slightly differently
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:53:52
except for 2(x+y) another possible solution there is x=0 and y=0
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:55:19
hm.. i might be wrong on that one... i've tried a couple of different approaches now 😄
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:55:33
Hmm how about subtracting the first 2: y-x = lambda * z (y-x)
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bac8edccad674791bdf920378e0bee9e
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Arne
01/16/2022 06:55:33
my paperwork is confusing (can you say that in english?)
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714,483,444,394,229,900
Frosty_
01/16/2022 06:55:44
I get what you mean
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:56:06
Oh yea i did that like yesterday or so! (but at that point i didnt take the derivative of z for some reason)
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:56:11
So we have 2 cases: 1. Lambda = 1/z Or 2. X=y
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:56:32
I'll just do 1 first
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:56:42
that's how i got $2z^2(x-y)=0$
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bac8edccad674791bdf920378e0bee9e
510,789,298,321,096,700
TeXit
01/16/2022 06:56:45
**Arne**
https://cdn.discordapp.c…941891158016.png
196376941891158016.png
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:57:06
Ok so if lambda*z = 1
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:57:19
And you put it into the 1st equation
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:57:28
You get z=0
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:57:35
Which is obviously wrong
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:57:41
So case 1 can't happen
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:57:52
Hence x=y
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:58:15
You get the same with this
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510,789,298,321,096,700
TeXit
0796
TeXit
true
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:58:25
Since we know none of the side lengths are 0
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:58:34
yup! but at that point i got stuck...
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:58:45
You get this now right?
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 06:59:17
Totally, like i said, i got to this point with multiple approaches (since it's no different from lagrangians with 2 variables)
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 06:59:43
Nice, now let's let x=y=k so that we can replace all the x and y with k
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 07:00:13
k+2z = lambda * kz 4k = lambda * k^2
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 07:00:38
And V = k^2*z
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 07:01:00
Now we can easily solve from here, I assume
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 07:01:37
(k+2z)/(kz) = 4/k
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 07:01:48
k+2z = 4z
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 07:01:58
And z = k/2
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 07:02:11
Now V = k^3/2
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 07:02:19
And we can get k from this
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 07:02:27
Which gives x, y and z
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 07:03:59
awesome!! thank you so much 😄
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 07:04:27
Np, Lagrange multipliers is a very cool tool to have
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 07:04:33
i really got stuck at this point and couldnt find an answer (for days actually... i've always tried it again with a different approach to get to this point again)
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bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 07:04:49
this seems so easy when you see the solution 😅
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bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 07:05:08
It happens sometimes
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help-10
bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 07:05:15
Especially if you've tried it a lot
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help-10
bac8edccad674791bdf920378e0bee9e
714,483,444,394,229,900
Frosty_
01/16/2022 07:05:32
Try to restart again with a clear mind so you don't go down the same path again
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help-10
bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 07:05:55
thanks again! 🙂
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help-10
bac8edccad674791bdf920378e0bee9e
196,376,941,891,158,000
Arne
01/16/2022 07:05:57
.close
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90
help-10
850c51b4d5d84951be67609a1c52e527
886,679,767,145,918,500
June8
01/16/2022 08:15:37
https://cdn.discordapp.c…1397416/Adsz.png
Adsz.png
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help-10
850c51b4d5d84951be67609a1c52e527
886,679,767,145,918,500
June8
01/16/2022 08:15:49
I don't understand the third line
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help-10
850c51b4d5d84951be67609a1c52e527
886,679,767,145,918,500
June8
01/16/2022 08:16:01
third fourth and the rest
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help-10
850c51b4d5d84951be67609a1c52e527
886,679,767,145,918,500
June8
01/16/2022 08:16:15
how do we derive it for theta?
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90
help-10
850c51b4d5d84951be67609a1c52e527
886,679,767,145,918,500
June8
01/16/2022 08:16:45
like when we take the derivative of f_x for theta what do we get?
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help-10
850c51b4d5d84951be67609a1c52e527
886,679,767,145,918,500
June8
01/16/2022 08:31:02
@Helpers
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help-10
850c51b4d5d84951be67609a1c52e527
869,532,694,688,706,600
EpsilonNought
01/16/2022 09:29:09
What language is this
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help-10
850c51b4d5d84951be67609a1c52e527
869,532,694,688,706,600
EpsilonNought
01/16/2022 09:29:15
I don’t understand
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help-10
850c51b4d5d84951be67609a1c52e527
886,679,767,145,918,500
June8
01/16/2022 09:29:26
it just asks
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help-10
850c51b4d5d84951be67609a1c52e527
886,679,767,145,918,500
June8
01/16/2022 09:29:44
$\pdv{f}{\theta*r}$
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90
help-10
850c51b4d5d84951be67609a1c52e527
510,789,298,321,096,700
TeXit
01/16/2022 09:29:47
**Cüneyt**
https://cdn.discordapp.c…767145918525.png
886679767145918525.png
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help-10
850c51b4d5d84951be67609a1c52e527
886,679,767,145,918,500
June8
01/16/2022 09:29:55
I couldn't type it but
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help-10
850c51b4d5d84951be67609a1c52e527
886,679,767,145,918,500
June8
01/16/2022 09:29:59
you got it
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90
help-10
850c51b4d5d84951be67609a1c52e527
869,532,694,688,706,600
EpsilonNought
01/16/2022 09:30:05
Ok yeh
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help-10
850c51b4d5d84951be67609a1c52e527
886,679,767,145,918,500
June8
01/16/2022 09:30:10
relations are given as you see
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90
help-10
850c51b4d5d84951be67609a1c52e527
869,532,694,688,706,600
EpsilonNought
01/16/2022 09:30:16
I see
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