• Today, 07:38
I am reading "Multidimensional Real Analysis I: Differentiation" by J. J. Duistermaat and J. A. C. Kolk ... I am focused on Chapter 2:...
1 replies | 20 view(s)
• Today, 06:50
I am reading "Multidimensional Real Analysis I: Differentiation" by J. J. Duistermaat and J. A. C. Kolk ... I am focused on Chapter 2:...
0 replies | 14 view(s)
• Today, 00:31
\frac{5}{4}\cdot\frac{4}{3}=\frac{5}{3} :)
14 replies | 202 view(s)
• Yesterday, 23:10
MarkFL posted a visitor message on Peter's profile
Sometimes editing a thread title is an issue, but the issue is with vBulletin. If you ever want to change a thread title, and can't, just let me know...
• Yesterday, 22:24
Thanks again Krylov .... BUT ... just a comment on D&K's proof .... I have to say that D&K's proof of Hadamard's Lemma though valid, is not...
3 replies | 68 view(s)
• Yesterday, 21:57
I am reading "Multidimensional Real Analysis I: Differentiation" by J. J. Duistermaat and J. A. C. Kolk ... I am focused on Chapter 2:...
0 replies | 19 view(s)
• Yesterday, 21:26
I am reading "Multidimensional Real Analysis I: Differentiation" by J. J. Duistermaat and J. A. C. Kolk ... I am focused on Chapter 2:...
0 replies | 28 view(s)
• Yesterday, 20:41
Thanks Krylov, ... followed your advice and obtained the result ... Thanks again ... Peter
3 replies | 68 view(s)
• Yesterday, 17:09
I'm going to walk through this problem, using your substitution...let's begin with: I=\int_{0}^{\Large\frac{3\pi}{4}}\int_{0}^{\pi}\int_{0}^{1}...
14 replies | 202 view(s)
• Yesterday, 16:30
Where did the $\cos(\theta)$ come from?
14 replies | 202 view(s)
• Yesterday, 16:28
I was simply taught that a linear function has no concavity...just recalling from memory. :)
20 replies | 232 view(s)
• Yesterday, 16:24
Let's look at an example that more clearly demonstrates the statement regarding concavity isn't always true. Consider: H(x)=\ln(x+1) And so: ...
20 replies | 232 view(s)
• Yesterday, 15:58
Perhaps there are differences in terminology...I was taught that a function is concave up on an interval when its second derivative is positive, and...
20 replies | 232 view(s)
• Yesterday, 15:47
Indeed, and is why I resorted to looking for a function satisfying the given criteria, that is not concave up on the given interval. :)
20 replies | 232 view(s)
• Yesterday, 15:41
You want to reverse the limits of integration, because of the negative sign in the differential resulting from your $u$-substitution (I don't know...
14 replies | 202 view(s)
• Yesterday, 14:37
Suppose $h(t)=c$, where $0<c$...what is $H(x)$?
20 replies | 232 view(s)
• Yesterday, 07:17
Oh! OK ... get the idea ... Thanks ... Peter
2 replies | 56 view(s)
• Yesterday, 07:04
I am reading "Multidimensional Real Analysis I: Differentiation" by J. J. Duistermaat and J. A. C. Kolk ... I am focused on Chapter 2:...
3 replies | 68 view(s)
• Yesterday, 00:23
I am reading "Multidimensional Real Analysis I: Differentiation" by J. J. Duistermaat and J. A. C. Kolk ... I am focused on Chapter 2:...
2 replies | 56 view(s)
• February 19th, 2018, 22:26
I now understand the above limit ... thanks to Ackbach and Krylov ... Thanks to you both ... Peter
3 replies | 76 view(s)
• February 19th, 2018, 22:10
MarkFL replied to a thread 8.7 Two ice skaters in Physics
There were a bunch of COLOR and FONT tags all over the place that I got rid of. :)
6 replies | 85 view(s)
• February 19th, 2018, 22:04
MarkFL replied to a thread 8.7 Two ice skaters in Physics
This is what I see: My bigger concern though is all the extraneous formatting codes, some of which were embedding inside your $\LaTeX$. I do...
6 replies | 85 view(s)
• February 19th, 2018, 20:34
If: u=\cos(\phi) then: du=-\sin(\phi)\,d\phi which would result in reversing the limits of integration. :)
14 replies | 202 view(s)
• February 19th, 2018, 20:14
MarkFL replied to a thread 8.7 Two ice skaters in Physics
As you can see, I've edited your post to remove a whole slew of extraneous formatting BBCodes...if you're going to paste your text from some other...
6 replies | 85 view(s)
• February 19th, 2018, 06:47
3 replies | 69 view(s)
• February 19th, 2018, 06:42
Thanks Krylov ... most clear and helpful ... Thanks again ... Peter
3 replies | 69 view(s)
• February 19th, 2018, 06:23
I am reading the book "Several Real Variables" by Shmuel Kantorovitz ... ... I am currently focused on Chapter 2: Derivation ... ... I need...
3 replies | 69 view(s)
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Some of my notes on number theoretic topics are on a few primality tests and on Hardy & Littlewood's result (incomplete). The other articles are on quintics : about a brief description of Kiepert algorithm and a short introduction on quintic-solving algorithms, respectively. I have also written up an introductory thread on Riemann Hypothesis

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