### Recent Posts

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##### APM346--Lectures & Home Assignments / Re: Exam Practice: Prob 69-72
« Last post by Rhamel on April 09, 2019, 10:09:58 PM »
yes
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##### APM346--Lectures & Home Assignments / Re: Exam Practice: Prob 69-72
« Last post by Victor Ivrii on April 09, 2019, 08:08:35 PM »
You understand, that in the left there is summation with respect to $j$?
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##### APM346--Lectures & Home Assignments / Exam Practice: Prob 69-72
« Last post by Rhamel on April 09, 2019, 05:30:05 PM »
When we are asked to "find the Euler-Lagrange of [some functional T[v]]" are we supposed to :
a) differentiate T[v+$\epsilon$ w] w.r.t to w and evaluate at $\epsilon = 0$ to get the EL, or
b) just plug the Lagrangian into

$$\frac{\partial}{\partial x_j} \frac{\partial \mathcal{L}}{\partial v_{x_j}} = \frac{\partial \mathcal{L}}{\partial v}$$
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##### APM346--Misc / Re: Scope of FE
« Last post by wangy602 on April 06, 2019, 03:23:03 PM »
Thank you, Professor.
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##### APM346--Lectures & Home Assignments / Final Exam Practice problems
« Last post by shuxian on April 02, 2019, 04:47:53 PM »
Anyone can give me a hint about Q4 uxy=0 uyz=0 and uzx=1? Thank you.
For Q13, my answer is u=1 if x=t<0,x-t<0; u=t if x+t>0,x-t>0;u=1/2+1/2(x+t) if x-t<0,x+t>0. I don't know whether it is right or not.
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##### APM346--Misc / Re: Scope of FE
« Last post by Victor Ivrii on April 02, 2019, 05:44:40 AM »
See practice problems and announcements
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##### APM346--Lectures & Home Assignments / Re: Home Assignment 9
« Last post by Rhamel on April 01, 2019, 06:55:44 PM »
Yes
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##### APM346--Lectures & Home Assignments / Home Assignment 9
« Last post by Zengyue Lin on March 31, 2019, 09:44:08 PM »
What does it mean solution depend on 𝜌? Is it equivalent to say “depend on r”?
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##### APM346--Misc / Scope of FE
« Last post by wangy602 on March 31, 2019, 06:17:23 PM »
What is the scope of the final exam?
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##### Home Assignment 6 / Re: Laplace Fourier Transform S5.3.P Q1
« Last post by shuxian on March 31, 2019, 05:19:13 PM »
Here is my solution for solving A.
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