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### Messages - Victor Ivrii

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1
##### Chapter 10 / Re: S 10.1 Lemma
« on: April 02, 2023, 05:15:13 AM »
This condition is not necessary. However more conditions to $\phi$ lead to a lesser class of admissible $\phi$ in the assumption  and thus to weaker assumption of Lemma 1, and thus to stronger and more general statement.

2
##### Test 2 / Re: 2022 midterm 2 solution: Possible typos?
« on: March 25, 2023, 06:48:46 AM »
Thanks! Fixed

3
##### Chapter 6 / Re: Question while calculating the solution to Laplace using separation of vars
« on: March 24, 2023, 08:28:50 PM »
Section 4.1ODE is not enough. You need to take into account also boundary conditions. See Section 4.1

4
##### Chapter 4 / Re: When is it a good idea to assume solutions are separable?
« on: February 27, 2023, 09:28:36 AM »
If domain is "simple" in the appropriate coordinate system it is a good idea to try to find such solutions. For linear equations we even can construct general solutions as linear combinations of such solutions. Details in the class later.

5
##### Chapter 3 / Re: Solving Heat equation
« on: February 13, 2023, 08:26:20 PM »
I will post solutions to show that all the integrals can be computed using elementary functions and $\operatorname{erf}(.)$

6
##### Quiz 1 / Re: Quiz 1 solution
« on: January 29, 2023, 08:22:28 AM »
Yes––as long as you post your variant solution

7
##### Chapter 1 / Re: Ch.1.1 - 8
« on: January 23, 2023, 06:41:49 AM »
yes, it is

8
##### Chapter 1 / Re: Ch.1.2(16)
« on: January 22, 2023, 03:32:12 PM »

14
##### Chapter 5 / Re: Chapter 5.3 Problem 1.1
« on: March 13, 2022, 04:19:38 PM »
You are right, it was a misprint

15
##### Test 1 / Re: Test 1 coverage
« on: March 03, 2022, 12:11:32 PM »
Look at samples posted

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