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• Yesterday, 22:22
Here's a link to a Desmos slope field for this ODE: https://www.desmos.com/calculator/my0rwuxl5x
3 replies | 71 view(s)
• Yesterday, 00:37
When you determine your integrating factor, you need only determine up to but not including the constant of integration: ...
3 replies | 71 view(s)
• February 20th, 2019, 03:31
Hi Tan Tom, welcome to MHB! ;) If I understand correctly, you have $$(1-2j)e^{j\frac\pi 2 n} +a_3 e ^ {-(j\frac\pi 2n)} + 3 + (-1)^{n+1}=sum$$...
1 replies | 58 view(s)
• February 19th, 2019, 20:32
There are some typos/issues with your work. See if you can spot them...:)
4 replies | 84 view(s)
• February 19th, 2019, 20:03
Yep. (Nod)
9 replies | 150 view(s)
• February 19th, 2019, 18:40
Correct. (Nod)
9 replies | 150 view(s)
• February 19th, 2019, 17:48
We have the property that the product of an invertible matrix with another matrix has the same rank as that other matrix. Can we prove that...
9 replies | 150 view(s)
• February 19th, 2019, 15:45
Congratulations! :cool:
4 replies | 85 view(s)
• February 19th, 2019, 15:41
Okay, if we are to consider a solution of the form: y=t^r Then: y'=rt^{r-1} y''=r(r-1)t^{r-2}
4 replies | 84 view(s)
• February 19th, 2019, 10:27
Congratulations, and welcome to the team! (Yes)
4 replies | 85 view(s)
• February 19th, 2019, 00:00
Let's try $$x=5$$: \sqrt{5-1}=5-7 2=-2 Is this true?
4 replies | 77 view(s)
• February 18th, 2019, 23:57
Overview: This product is designed to allow you to specify which usergroups will have access to the user ignore system. Users who are not a member...
0 replies | 49 view(s)
• February 18th, 2019, 22:42
What do you get when you substitute each potential solution into the original equation?
4 replies | 77 view(s)
• February 18th, 2019, 20:22
MarkFL replied to a thread Starred Posts in vBulletin Products
I've installed this product on many vB sites without issue. As I said in another thread, I really recommend that you upgrade your vB. It's very old....
4 replies | 770 view(s)
• February 18th, 2019, 20:18
MarkFL replied to a thread Forum Marquee in vBulletin Products
Please send me the login credentials by PM to an admin account on your site, and I will see if I can figure out what the issue on your site is. You...
2 replies | 569 view(s)
• February 17th, 2019, 13:36
Suppose less than 2 columns of $B$ are not in the null space of $A$. Then at least 4 columns are in the null space. What is the rank of $AB$ then?...
9 replies | 150 view(s)
• February 17th, 2019, 12:24
Hey mathmari!! That's about the nullity of $B$. It's not related to the nullity of $A$ is it? (Worried) Since the rank of $A$ is $2$, its null...
9 replies | 150 view(s)
• February 17th, 2019, 09:24
Hi SigmaS, welcome to MHB! ;) In higher level math we don't always deal with regular multiplication and addition. Even then, PEMDAS is usually...
1 replies | 90 view(s)
• February 16th, 2019, 05:02
So this is what it looks like: \begin{tikzpicture} \newcommand{\coordinates}{ \draw (0,-2) grid (6,2); \draw (0,0) -- (6.4,0) node{}; ...
3 replies | 132 view(s)
• February 15th, 2019, 17:10
How many PIN codes are possible...can you apply the fundamental counting principle to answer this question?
2 replies | 217 view(s)
• February 14th, 2019, 18:32
(Party) (Cake)
• February 14th, 2019, 18:01
Yes. And those pieces should be between those $x_i$. That is, between each $x_i$ and $x_{i+1}$ we should have a polynomial of degree $\le 3$. It...
1 replies | 102 view(s)
• February 14th, 2019, 17:03
Hey mathmari!! I have just read the wiki article about Gershgorin circles. As I understand it, and this is verifiable from the proofs that are...
3 replies | 132 view(s)
• February 13th, 2019, 04:03
Ah yes, $P$ has to be whatever row permutation it takes to ensure that $L$ is a lower triangular matrix. We have: L =P\cdot P_0^{-1}\cdot...
5 replies | 106 view(s)
• February 13th, 2019, 00:02
MarkFL replied to a thread Career Change in Chat Room
Good luck, Adrian! I've had family members as well as myself receive care at the Mayo Clinic in Jacksonville and St. Augustine here in Florida. They...
6 replies | 163 view(s)
• February 10th, 2019, 23:33
We could set: y(t)=-\frac{g}{2}t^2+v_0\sin(\theta)t=0 Let's multiply by -2: gt^2-2v_0\sin(\theta)t=0 Now, for the quadratic formula, we...
16 replies | 299 view(s)
More Activity

### 12 Visitor Messages

1. I thought IBrahimovich would show off but he was alone and presumably tired. It is good it ended with only one goal , you still have a chance on your ground .
2. Hey Petrus , good luck today against Portugal .
3. Hey Petrus, I just wanted to let you know without cluttering your topic that the image you posted is oriented correctly for me.

Best Regards,

Mark.
4. Hey Petrus,

I wanted to tell you, but not clutter your latest topic, that matrice is not a proper English word. The singular is matrix and the plural is matrices. For example you might say, the determinant of this matrix is... or you might say the product of these two matrices is...

I hope this helps!
5. I am well , study well .
6. Hello petrus , long time no see , I hope you are doing well!
7. Hey Petrus,

Congratulations on your richly deserved MHB Model User Award!
8. Hello Petrus,

I wanted to take a moment to commend you on your use of LaTeX. Your latest topic was very well written, and you have come a long way in a short while with using LaTeX! It is obvious you are reading the suggestions given here and using them.

Best Regards,

Mark.
9. Hey Petrus,

I am glad to hear my suggestion worked!

I must ask you to not use text-speak abbreviations in your posts, such as idk, ik, etc. This is part of rule 12 about using abbreviations. Technically, this is a violation of the rules and as a Global Moderator, I have accepted the duty of enforcing these rules for the good of the forum.

Not everyone is familiar with these abbreviations, and it is better to type out these phrases, so that your posts are understandable to a wider audience. Also, I feel that posting a math question on a forum is a more formal setting than sending a text message to a friend. I am merely giving you advice to help you get better and more prompt help.

Best Regards,

Mark.
10. Thanks Mark! Now it works!
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About Petrus

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Name: MHB Model User Award (Jan-June 2013)
 Issue time: July 1st, 2013 22:14 Issue reason: