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10357688 No.10357688 [Reply] [Original]

FUCK Calculus of Variations

>> No.10357699

The problem isn't you it's the unclear books and arrogant professors.

>> No.10357718

>>10357699
Hello OP

>> No.10357720

>>10357699
Is there any clear book? I've gotten A's in every math class up to real analysis and I feel like an irredeemable moron, I've tried gelfand but the notation is dense and my eyes just glaze over.

>> No.10357775

>>10357688
FUCK DEs

>> No.10357814

This board is really gone isn't it

>> No.10357856

>>10357720
Ive got A- in all my physics courses (i'm a physicist) but i've gotten all C in my math courses (Cal, LA, ODE, PDE, CA)

>> No.10357857

>>10357688
FUCK u 2 pal

>> No.10357864

>>10357856
>CA
Physicists have to study commutative algebra?

>> No.10357871

>>10357864
Complex analysis

>> No.10357873

>>10357871
i'm a math major taking "complex analysis for physics" because it's only 2 credits and it's easy as fuck, barely any proofs

>> No.10357889

>>10357873
We have to take all of our math courses under the math department, it's literally full of proofs and i was never able to learn it decent enough to actually apply it to my studies, when talking about topological insulators i didn't understand shit once we got to the complex analysis portion of the lecture regarding said insulators.

>> No.10357896
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10357896

>>10357889
>we have to take all of our math courses under the math department
There are places other than brazillian public universities which do that?

>> No.10357908

>derive the Euler Equation and boundary conditions, solve, find the first integral
[eqn]\min_{u(x)}\left[\int_{0}^{1} ((u')^2 \omega^2 u^2)dx +2u(1) \right],u(0) = 0[/eqn]
what the FUCK do i do

>> No.10357916

>>10357908
fuck it should be [eqn]((u')^2 - \omega^2 u^2)dx [/eqn]

>> No.10357924

>>10357916
Did you try looking at an example in your book and copying the steps?

>> No.10357925

>>10357924
i can get to the answer by copying but i have no idea what's going on and what 2u(1) even is

>> No.10357928

>>10357925
Literally the function u evaluated at 1.

>> No.10357944

>>10357928
okay i'm a brainlet
how about
>derive the euler equation and transversality condition, solve
[eqn] \min_{u(x),b}\int_{0}^{b}((u')^2-2u + x)dx,u(0)=1, u(b)=0[/eqn]
the version in the text didn't have u(b) = 0 and it skips steps