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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, 15:22
You are right. Since $\arctan(-x)=-\arctan(x)$, it is easy to see that $|x_n|=y_n$ for all $n$. You are also right that $y_n$ is decreasing....
1 replies | 61 view(s)
• Yesterday, 14:58
Evgeny.Makarov replied to a thread Jokes in Chat Room
I would say that the distance between opposite vertices in a rectangle is the diameter. This terminology is used in graph theory. Professor: What...
216 replies | 33269 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, 18:58
So, correct are only the statements (1), (4), (5), or not? (Wondering)
9 replies | 150 view(s)
• February 19th, 2019, 18:40
Correct. (Nod)
9 replies | 150 view(s)
• February 19th, 2019, 18:31
Ah (6) is not true, because we have for every b. It would be true if we had for some b, or not? (Wondering)
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, 06:51
Hi, and welcome to the forum. Can you figure out the initial position (height above the ground) of the minute hand tip at 10 a.m.? Also, do you...
1 replies | 54 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, 18:20
Is the rank of $AB$ less than the minimum of the rank of $A$ and the rank of $B$ ? (Wondering) Does it need a proof or can we just say...
9 replies | 150 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, 13:08
Could you explain to me this part further? I got stuck right now. (Wondering) So, a system $Ax=b$ has either no solution or infinitely...
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, 10:26
Hey!! :o Let $A$ be a $4\times 5$ matrix with rank $2$ and let $U$ be the corresponding row echelon form matrix. I want to check if the...
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)
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1. Would it be possible if you helped me on a thread in the Trigonometry Forum? I am still stumped.
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I think if you ask for the proof of FLT for n = 4 in a different thread it would be better as it would be off-topic on the current thread. If you post it as a separate question, I'd be more than willing to answer to it.
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