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• Today, 03:13
Here is this week's POTW: ----- Find the exact value for the real root of the equation $x^3+3x-2=0$. ----- Remember to read the POTW...
0 replies | 27 view(s)
• Today, 02:59
Congratulations to the following members for their correct solution::) 1. kaliprasad 2. lfdahl Honorable mention goes to cmath123, as he has his...
1 replies | 107 view(s)
• Yesterday, 20:12
Yes. $$= = = 1$$
3 replies | 46 view(s)
• Yesterday, 19:34
Hi FallArk! The $$notation indicates the floor function. That is, rounding down to the nearest integer below x. Btw, I prefer the notation... 3 replies | 46 view(s) • Yesterday, 17:49 I like Serena replied to a thread [SOLVED] How to prove continuity? in Analysis Hi FallArk! ;) Let's take the definition of continuity into account:$$\lim_{x\to c} f(x) = f(c) \ne 0 This means that for any $\epsilon>0$...
4 replies | 59 view(s)
• Yesterday, 04:59
Joseph A. Gallian, in his book, "Contemporary Abstract Algebra" (Fifth Edition) defines an irreducible element in a domain as follows ... (he also...
0 replies | 34 view(s)
• Yesterday, 04:23
Thanks for the help johng ... But i am still a bit puzzled ... I think we have to show that \{ \frac{k}{ 2^n} \ | \ k.n \in \mathbb{Z} \} is...
3 replies | 51 view(s)
• Yesterday, 02:29
MarkFL replied to a thread 231.14.88 3d surface in Calculus
Multiplying through by $9+6x-8y$ and distributing the $26$, we obtain -x^2-y^2+z^2=156x-208y+234 -x^2-156x-y^2+208y+z^2=234 ...
3 replies | 53 view(s)
• February 17th, 2017, 17:44
Simplex yes. And no, we didn't need to figure out the configurations - they were given. At best it helps a bit to understand the problem statement....
11 replies | 126 view(s)
• February 17th, 2017, 16:05
Looks good. Does that mean that we're done? (Wondering)
11 replies | 126 view(s)
• February 17th, 2017, 15:20
Yes and yes. What would the objective function be? (Wondering)
11 replies | 126 view(s)
• February 17th, 2017, 14:11
Yes and yes. How many plates A and B do we need? (Thinking)
11 replies | 126 view(s)
• February 17th, 2017, 02:59
We have $2010 y + 2010 x = xy$ or $xy - 2010x - 2010y = 0$ or $(x-2010)(y-2010) = 2010^2= 2^2 * 3^2 * 5^2 * 67^2$ the above has...
2 replies | 98 view(s)
• February 17th, 2017, 01:20
My attempt: Given the relation: \ Both $x$ and $y$ must be greater than $2010$.
2 replies | 98 view(s)
• February 17th, 2017, 01:20
Can't we fit another 300x700 in the scrap at the right of size 300x1000? (Wondering)
11 replies | 126 view(s)
• February 16th, 2017, 23:12
I am reading Stephen Lovett's book, "Abstract Algebra: Structures and Applications" and am currently focused on Chapter 5 ... I need some help...
3 replies | 51 view(s)
• February 16th, 2017, 09:40
Variation on Ifdahl's solution: Let $y = x + \frac1x$. Then $\bigl(\sqrt{y+1} + \sqrt y\bigr)\bigl(\sqrt{y+1} - \sqrt y\bigr) = y+1-y = 1$....
3 replies | 123 view(s)
• February 15th, 2017, 20:29
You have two points on the graph, so you can compute the slope as follows: m=\frac{\Delta y}{\Delta x}=\frac{y_2-y_1}{x_2-x_1} Then, you can...
2 replies | 58 view(s)
• February 15th, 2017, 18:02
My attempt: Given the equation: \ Let $y = x+\frac{1}{x}$. Squaring the given equation:
3 replies | 123 view(s)
• February 15th, 2017, 00:27
I like Serena replied to a thread [SOLVED] Tests in Advanced Probability and Statistics
That looks correct yes. (Nod)
16 replies | 174 view(s)
• February 14th, 2017, 23:47
Yes, the derivative of the function evaluated at the $x$-coordinate of the tangent point will give you the slope $m$ of the tangent line. :)
4 replies | 89 view(s)
• February 14th, 2017, 23:18
The first derivative of a function gives you the slope of the tangent line, not the tangent line itself. Thus,for some function $f(x)$, the tangent...
4 replies | 89 view(s)
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### 24 Visitor Messages

1. Happy Birthday Opalg!! So glad you're here for another year. Have a great time celebrating.
2. Hi Opalg, happy birthday! How are things?
3. Happy birthday!
4. Hello Opalg, I am unable to post a reply to your response due some bugs in the website on the thread I started regarding complexification. I have asked Jameson to look into the issue. I will reply as soon as the issue is resolved.
5. HB, Opalg!
6. I actually was just going to send you a Happy Birthday wish...I hope you have a good one and I hope you enjoy your time in Gran Canaria too!
7. Happy Birthday, Opalg! I hope you are in good company and in good spirits today.
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#### February 12th, 2017

Ranks Showcase - 8 Ranks
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Name: Graduate POTW Award (2016)
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Name: MHB Analysis Award (2016)
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Name: Graduate POTW Award (2015)
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Name: Graduate POTW Award (Jul-Dec 2013)
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Name: MHB Pre-University Math Award (Jul-Dec 2013)
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Name: Graduate POTW Award (Jan-June 2013)
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Name: MHB Advanced Algebra Award (Jan-June 2013)
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Name: MHB Analysis Award (Jan-June 2013)
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