• Today, 10:47
Hello!!! (Wave) I am trying to find the solution of the following Cauchy problem. $$\frac{dy}{dx}=\frac{y}{x+ \sqrt{x^2+y^2}}, y(0)=1$$ By...
0 replies | 0 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, 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 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, 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)
• February 14th, 2017, 22:17
Let's try your substitution of: u=x+9\implies du=dx I=\int_9^{18}\frac{(u-9)^3}{u^2}\,du By the binomial theorem: ...
1 replies | 47 view(s)
• February 14th, 2017, 18:15
I like Serena replied to a thread [SOLVED] Tests in Advanced Probability and Statistics
We need another section on that same page where it says unequal variances... (Thinking)
16 replies | 174 view(s)
• February 14th, 2017, 17:48
I like Serena replied to a thread [SOLVED] Tests in Advanced Probability and Statistics
Hmm... that table gives $F^*=1.03$ for $\alpha=0.05$, $DF_1 > 1000$, and $DF_2 > 1000$. And we had $F=1.19$, so that implies we need to assume...
16 replies | 174 view(s)
• February 14th, 2017, 17:37
I like Serena replied to a thread [SOLVED] Tests in Advanced Probability and Statistics
That looks as if it's about the degrees of freedom for the t-test we're going to do. And that depends on whether we're going to do the t-test with...
16 replies | 174 view(s)
• February 14th, 2017, 17:31
For the record, this is what the distributions look like when trying to determine $\beta$. \begin{tikzpicture} \pgfmathdeclarefunction{gauss}{3}{%...
13 replies | 142 view(s)
• February 14th, 2017, 16:26
I like Serena replied to a thread [SOLVED] Tests in Advanced Probability and Statistics
Right. The degrees of freedom are respectively $DF_1 = n_1 -1 = 1541 - 1$ ($x$-axis) and $DF_2 = n_2 - 1= 1598 - 1$ ($y$-axis). The first table...
16 replies | 174 view(s)
• February 14th, 2017, 16:07
I like Serena replied to a thread [SOLVED] Tests in Advanced Probability and Statistics
Yes... although it seems we didn't actually square those values... (Worried) That table is a bit awkward. It doesn't show sufficient degrees of...
16 replies | 174 view(s)
• February 14th, 2017, 15:43
I like Serena replied to a thread [SOLVED] Tests in Advanced Probability and Statistics
That link links to this page... (Worried) Anyway, the procedure how to do the F-test for equality of variances is explained here in wiki.
16 replies | 174 view(s)
• February 14th, 2017, 14:37
I like Serena replied to a thread [SOLVED] Tests in Advanced Probability and Statistics
Hey mathmari!! (Smile) Either way, we're going to do an independent 2-sample t-test. The only question is how we're going to calculate the...
16 replies | 174 view(s)
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