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• Today, 11:06
The problems with MHF were always about personnel and authority structure. If the leaders of MHF had been willing to appoint multiple admins, like we...
5 replies | 180 view(s)
• Today, 02:53
Thank you for pointing this out. I have not looked at other sites in a long time so don't know these things. If a merge was possible I promise I...
5 replies | 180 view(s)
• Today, 02:01
Hey firemath, Thank you for the reply. It's great to hear back from someone on this tough topic. I actually strongly prefer a merge over other...
5 replies | 180 view(s)
• Yesterday, 14:20
Let $f:\mathbb R\to \mathbb R$ be a twice-differentiable function such that $f(x)+f^{\prime\prime}(x)=-x|\sin(x)|f'(x)$ for $x\geq 0$. Assume that...
1 replies | 61 view(s)
• April 6th, 2020, 17:02
Prove It is not giving you the answer he is giving you a suggestion that you can use the limit he posted. See if there is any kind of substitution...
4 replies | 91 view(s)
• April 6th, 2020, 12:06
Hi all, I think even we do switch to XF (is still going to happen) the time has come to make a change. We have a database of amazing content here...
5 replies | 180 view(s)
• April 6th, 2020, 11:37
Hi all, I hope you are all safe, healthy, and not affected in a serious way by the world wide COVID-19 virus. Here in the US it has completely...
0 replies | 55 view(s)
• April 5th, 2020, 01:08
Here is this week's POTW: ----- Suppose that the positive integers $x, y$ satisfy $2x^2+x=3y^2+y$. Show that $x-y, 2x+2y+1, 3x+3y+1$ are all...
0 replies | 228 view(s)
• April 5th, 2020, 01:02
No one answered last week's POTW.(Sadface) Below is a suggested solution: The given function is the square of the distance between a point of the...
1 replies | 178 view(s)
• April 3rd, 2020, 15:47
I have obtained access to the full solutions manual, after contacting Wiley about it. I will not type up the solution in full, but simply note a few...
1 replies | 295 view(s)
• April 2nd, 2020, 15:47
In the mid-1990's, an electrical engineer/computer scientist by the name of Judea Pearl started to change the world by greatly improving our...
0 replies | 258 view(s)
• April 2nd, 2020, 11:56
topsquark replied to a thread f in Calculus
I believe the proper question is "What the 'f'?" -Dan
5 replies | 351 view(s)
• April 1st, 2020, 15:04
$\newcommand{\doop}{\operatorname{do}}$ Problem: (This is from Study question 4.3.1 from Causal Inference in Statistics: A Primer, by Pearl,...
1 replies | 295 view(s)
• March 31st, 2020, 17:53
topsquark replied to a thread [SOLVED] 299What is the acceleration in Calculus
Wait! What do you mean by you changed it to v(t)? The particle's position is x(t) = sin(t) - cos(t) means that v = \dfrac{dx}{dt}. You can't just...
4 replies | 341 view(s)
• March 27th, 2020, 23:42
Here is this week's POTW: ----- Find the minimum value of $(u-v)^2+\left(\sqrt{2-u^2}-\dfrac{9}{v}\right)^2$ for $0<u<\sqrt{2}$ and $v>0$. ...
1 replies | 178 view(s)
• March 27th, 2020, 23:38
Hi MHB! I have decided to extend the deadline by another week so that our members can give this problem another shot and I am looking forward to...
1 replies | 226 view(s)
• March 26th, 2020, 20:42
Have you tried looking at \lim_{n \to \infty} \dfrac{a_{n + 1}}{a_n}? -Dan
2 replies | 107 view(s)
• March 26th, 2020, 18:35
Let y'(x) = v(x). Then your equation becomes v'(x) + v(x) = -F(x) Now you have a first degree linear ordinary differential equation. You can't...
1 replies | 102 view(s)
• March 20th, 2020, 19:44
topsquark replied to a thread [SOLVED] s8.2.5.7 chain rule in Calculus
Look at your first factor: \left ( 7x^6 + 8 x^3 \right ) ^3 = ( x^3 ( 7 x^3 + 8 ) )^3 = (x^3)^3 (7 x^3 + 8 )^3 Don't worry. It's an easy mistake...
2 replies | 306 view(s)
• March 20th, 2020, 02:18
Here is this week's POTW: ----- Show that the set of real numbers $x$ which satisfy the inequality \sum_{k=1}^{70}\dfrac{k}{x-k}\ge...
1 replies | 226 view(s)
• March 20th, 2020, 02:15
Congratulations to the following members for their correct solution! 1. castor28 2. lfdahl 3. kaliprasad 4. Oxide Solution from Oxide: ...
1 replies | 236 view(s)
• March 19th, 2020, 08:52
Just as a heads up, when we make the switch over to XenForo I will need to close MHB temporarily to do this. I hope it won't take more than part of a...
10 replies | 2209 view(s)
• March 14th, 2020, 23:06
All of the other answers could be true but since f(x) is not given we could make the function do some or all of these possibilities, as well as...
7 replies | 247 view(s)
More Activity

### 67 Visitor Messages

1. Hiii Ack,

Would you like to comment on my avatar??
2. Hey Ack!

What do you say?
3. Thanks for the new update...that sidebar

Its better than in MHF
4. you must see this...this is great

http://integrals.wolfram.com/ is a site that can integrate automatically(not all)

And I Was hoping whether MHF is still alive??
5. Thanks for the warning in my post.... i would keep a check on it always
6. Hi Ackbach,

Thanks! I really appreciate it.
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1. #### AlexmahoneOffline

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MHB Master

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#### April 1st, 2020

Ranks Showcase - 3 Ranks
Icon Image Description

Name: MHB Chat Room Award (2017)
 Issue time: January 21st, 2018 09:46 Issue reason: Congratulations!

Name: MHB Math Notes Award (2016)
 Issue time: January 9th, 2017 14:42 Issue reason:

Name: MHB Math Notes Award (2015)
 Issue time: January 7th, 2016 11:11 Issue reason: