• Yesterday, 17:22
I believe that it should be: \begin{align*}\frac{\partial}{\partial{t}}f(x+c(t-\tau ),\tau)&=f_x(x+c(t-\tau ),\tau)\cdot...
11 replies | 152 view(s)
• Yesterday, 14:06
I think this is correct yes. (Nod) And we can simplify it bit more since $f(y,\tau)$ does not depend on $t$. Therefore $\pd{}t f(y,\tau)=0$....
11 replies | 152 view(s)
• Yesterday, 06:39
I am reading T. S. Blyth's book: Module Theory: An Approach to Linear Algebra ... I am focused on Chapter 2: Submodules; intersections and sums...
0 replies | 32 view(s)
• Yesterday, 03:00
In Chapter 1 of his book: "Modules and Rings", John Dauns (on page 7) considers a subset T of an R-module M and defines the R-submodule generated by...
0 replies | 35 view(s)
• Yesterday, 00:27
Hi steenis ... despite your help (thank you) ... I have not been able to make much progress on the converse ... see below ... Converse: ...
14 replies | 240 view(s)
• May 24th, 2018, 16:06
Ah okay. My mistake. (Blush) So we have: \begin{tikzpicture} \coordinate (A) at (-1,0); \coordinate (B) at (1,0); \coordinate (C) at...
6 replies | 86 view(s)
• May 24th, 2018, 16:00
MarkFL replied to a thread Word problem on vectors in Geometry
Hello, and welcome to MHB, Gummg! (Wave) I would write the plane's velocity vector as: \vec{v}=485\left\langle...
3 replies | 78 view(s)
• May 24th, 2018, 15:38
Brainstorming some more, I believe we are approximating $y(x)$ with its Fourier form, which is: $$y(x) \approx \sum_{j=1}^{n-1} a_j \sin(jx)$$ It...
2 replies | 70 view(s)
• May 24th, 2018, 15:16
Because: \begin{tikzpicture} \coordinate (A) at (-1,0); \coordinate (B) at (1,0); \coordinate (C) at (0,{sqrt(3)}); \coordinate (D) at...
6 replies | 86 view(s)
• May 24th, 2018, 14:18
Hi ion88, welcome to MHB! (Wave) No worries. I believe you've already correctly filled in the table, which is what MarkFL uploaded for you. ...
4 replies | 97 view(s)
• May 24th, 2018, 14:06
Can it be that it should be side length $2b$ and height $a$? (Wondering) I don't think $AFA_1$ is equilateral. And $A_1$ is not in the...
6 replies | 86 view(s)
• May 24th, 2018, 10:27
Hey mathmari!! (Wave) It seems to me that the matrix indeed comes from the finite differences method. It identifies the problem that we want to...
2 replies | 70 view(s)
• May 23rd, 2018, 14:46
I think it should be $f(y,t)$ and $f_t(y,t)$, shouldn't it? Otherwise I believe it's all correct. (Happy)
11 replies | 152 view(s)
• May 23rd, 2018, 11:43
Here is this week's POTW: ----- Prove that there are only a finite number of possibilities for the ordered triple $(a-b,\,b-c,\,c-a)$ where...
0 replies | 67 view(s)
• May 23rd, 2018, 11:40
Congratulations to the following members for their correct solution:): 1. Olinguito 2. Opalg Solution from Opalg: If...
1 replies | 104 view(s)
• May 23rd, 2018, 10:55
If $\phi(x)\ne 0$ then we must have that $x\le \beta$ yes? And $\beta \le |\beta| \le \max(|\alpha|,|\beta|)$ isn't it? So if $\phi(x)\ne 0$ then...
19 replies | 298 view(s)
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### 37 Visitor Messages

1. Hello and welcome back to MHB, mathmaniac!

We are happy to see that you have returned, and we look forward to your continued participation here!

On Behalf Of MHB's Staff,

MarkFL.
2. Hello and welcome back to MHB, mathmaniac!

We are happy to see that you have returned, and we look forward to your continued participation here!

On Behalf Of MHB's Staff,

MarkFL.
3. LOL! Kind of obvious, eh?

But yes, I created a vBulletin product that will welcome new and returning members via visitor message, drawing randomly from a list of staff members who have signed on to be the authors of such messages.
4. Hello and welcome back to MHB, mathmaniac!

We are happy to see that you have returned, and we look forward to your continued participation here!

On Behalf Of MHB's Staff,

MarkFL.
5. Happy Birthday! Hope you had a nice one!
6. Thanks!
7. I live in the central part of Sri Lanka from the time I was born. Only the north and north eastern parts of Sri Lanka was heavily effected by the war. There was a risk of bomb explosions and terrorist attacks all around the country but we weren't in the war zone and weren't directly effected by the war.
8. I don't have much of a liking for exams too. But you know, they are there and will be there in times to come. If you are getting A's and A+'s for all your exams that should be thought of as a privilege at least. When I was in school, I rarely got good grades and most of the time I was the 22~27th in the class (out of about 30~36 students). The problem about this is that I was told by many people to study harder and achieve something better. So if you can achieve A's and A+'s effortlessly that is something to be quite happy about.

Yes, the war in Sri Lanka is completely over, which I think is a great thing indeed.
9. Why don't you think it's a big deal? But in a way, taking it casually is also great 'cause you'll not get pressurized by the feeling that you have to continue getting A+'s.
10. Wow, all A+'s! That's wonderful to hear. Hope you'll be able to continue the good work.
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