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• Today, 15:31
Yes, but you used it on the original ODE, not the one in standard linear form. :)
4 replies | 54 view(s)
• Yesterday, 14:11
Yes. And it also assumes we take $\nu=2$ steps with the damped Jacobi method. (Nod) It's not quite clear from the text to me. With a choice...
16 replies | 405 view(s)
• Yesterday, 12:19
We can freely choose to use $\omega=2/3$ or a different $\omega$, or not use the damped Jacobi method at all. The chapter explains that it's giving...
16 replies | 405 view(s)
• Yesterday, 06:19
Thanks steenis ... No worries at all ... Thanks for all your help ... Peter
10 replies | 172 view(s)
• Yesterday, 06:04
Thanks Steenis ... That proof seems really clear ... Will work through it again shortly... Peter
4 replies | 73 view(s)
• Yesterday, 05:48
O, I am sorry. not you gave a wrong answer, I did gave a wrong answer and I do not know how to delete a submitted post in which I wrote rubbish. ...
10 replies | 172 view(s)
• Yesterday, 05:45
You have to prove that: $N_1 + \cdots + N_n = \langle N_1 \cup \cdots \cup N_n \rangle$ You defined $N = N_1 \cup \cdots \cup N_n$ You defined...
4 replies | 73 view(s)
• Yesterday, 05:18
Sorry Steenis ... I don't understand you ... Can you give me a hint as to what is wrong ...? Peter
10 replies | 172 view(s)
• Yesterday, 05:11
10 replies | 172 view(s)
• Yesterday, 04:51
Thanks steenis ... most helpful ... Can see that the short exact sequence $0\rightarrow \text{ker } f \overset{i}{ \rightarrow}R^{(n)}... 10 replies | 172 view(s) • Yesterday, 01:22 ======================================================================== Since I could not see any specific errors, I have completed the proof... 4 replies | 73 view(s) • June 17th, 2018, 21:49 Hi mathmari, I will try to clear up the points of confusion. All good questions. This means that$f$possesses an inverse when restricted... 3 replies | 70 view(s) • June 17th, 2018, 17:08 Hi mathmari, Here are a few hints to try to push things along: Note that$F(x_{0},y_{0})=0$and that$J_{F,x}(x_{0},y_{0})=J_{f}(x_{0}),$... 3 replies | 70 view(s) • June 17th, 2018, 12:39 MarkFL replied to a thread [SOLVED] 2.2.3 de with tan x in Differential Equations I can't imagine trying to use the internet on a telephone. I'm sorry scrolling on a telephone is such a chore...they should fix that. 8 replies | 106 view(s) • June 17th, 2018, 08:32 No, I think the above is not correct. If$Y$is generated by$X$, notation$Y =\langle X \rangle$iff for every$y \in Y$:$y = \Sigma_{ j = 1 }^{...
4 replies | 73 view(s)
• June 17th, 2018, 07:47
We have an $R$-epimorphism $f:R^{(n)} \rightarrow M$. $R^{(n)}$ is noetherian. Then $\text{ker } f \leq R^{(n)}$ and $R^{(n)} / \text{ker } f$...
10 replies | 172 view(s)
• June 17th, 2018, 05:04
Peter started a thread Deveno ... in Chat Room
Deveno is much missed ... especially by those who frequent the Linear and Abstract Algebra Forum ... Deveno's pedagogical abilities were as...
0 replies | 43 view(s)
• June 17th, 2018, 04:40
I am reading Dummit and Foote's book: "Abstract Algebra" (Third Edition) ... I am currently studying Chapter 10: Introduction to Module Theory ......
4 replies | 73 view(s)
• June 17th, 2018, 00:59
MarkFL replied to a thread [SOLVED] 2.2.3 de with tan x in Differential Equations
Are you using Tapatalk by any chance? I have code in place to let me know when posts have been edited, so I don't miss added content (it's better to...
8 replies | 106 view(s)
• June 17th, 2018, 00:52
MarkFL replied to a thread [SOLVED] 2.2.3 de with tan x in Differential Equations
When you multiply by $\mu(x)$, you get: \sec(x)y'+\tan(x)\sex(x)y=\sec(x)\sin(2x) This can be written as: ...
8 replies | 106 view(s)
• June 16th, 2018, 23:10
Thanks Steenis ... You have shown that $R^{(n)} / N \cong M$ where $N = \text{ Ker } f$ ... ... ... ... ... (1) ... and we have by...
10 replies | 172 view(s)
• June 16th, 2018, 19:51
MarkFL replied to a thread [SOLVED] 2.2.3 de with tan x in Differential Equations
-\ln(\cos(x))=\ln\left((\cos(x))^{-1}\right)=\ln(\sec(x))
8 replies | 106 view(s)
• June 16th, 2018, 19:38
MarkFL replied to a thread [SOLVED] 2.2.3 de with tan x in Differential Equations
\mu(x)=\exp\left(\int \tan(x)\,dx\right)=e^{\Large\ln(\sec(x))}=\sec(x)
8 replies | 106 view(s)
• June 16th, 2018, 04:56
No, $\text{ker } f = 0$ iff $f$ is a monomorphism. In this case $f$ is an epimorphism, and $\text{ker } f$ need not be $0$, Say $N = \text{ker }... 10 replies | 172 view(s) • June 16th, 2018, 00:29 300+300\cdot\frac{1666}{100}=300(1+16.66)=300\cdot17.66=5298 Here, we have taken 300, and added 1666% of 300 to it. However if we multiply 300 by... 4 replies | 101 view(s) • June 16th, 2018, 00:03 Thanks steenis ... but not sure if I follow .. ... but will try ... as follows ... We have an epimorphism$f:R^{(n)} \longrightarrow M\$ ...
10 replies | 172 view(s)
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### 20 Visitor Messages

1. Hi Peter,

Thank you for pointing this out to me. I will talk it over with the staff.

In the future there is a "report" button for posts which will create a thread in the staff forum for us to review. This is just for your convenience and to keep things less public if you like. I don't mind you reaching out to me in any way that you like.

Best,
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2. Hello Peter,

When I first saw that post, I saw that Adrian (Ackbach) had replied to it, so I didn't think much about it. The user to whom Wilmer was addressing his post was already on staff radar as being a potential spammer. Wilmer's posting demeanor can be a bit rough sometimes, but he means no harm as far as I can tell.
3. 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 and I can fix it.
4. Hey Peter!

I edited your post to remove the duplicate content. Sorry for the late reply, I was busy "powering through" a tedious 3 hour project.
5. Glad to hear that resolved the issue! I thought perhaps forcing your browser to reload the script by removing it from your cache might do the trick.
6. Hmmm...have you tried clearing your cache on your iPad?
7. Hey Peter,

No, there have been no changes in that regard, at least that I know of. Do you visit any other sites that use MathJax? If so does it render there?

Best Regards,

Mark.
8. Good deal, Peter! I wish I had a nickel for every time a problem is corrected by ditching IE and using a modern standards compliant browser.
9. I would try another browser...IE is notorious for being problematic.
10. Hello Peter,

No changes to composing posts have been made. What browser are you using? What OS?
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