• Today, 00:39
Thanks GJA ... your post is extremely helpful and clarifying ... Just a simple point of clarification ... You write: " ... ... Take...
3 replies | 45 view(s)
• Yesterday, 22:08
topsquark replied to a thread [SOLVED] Quotient Maps in Topology and Advanced Geometry
Alright. I think I'm trying to think this one too hard. Thanks for the comment about a surjective functions and equivalence relations. I had never...
2 replies | 80 view(s)
• Yesterday, 18:12
The following shows how a figure can be divided into 4 congruent pieces. How can we divide the same figure into 5 congruent pieces?...
0 replies | 27 view(s)
• Yesterday, 10:48
We start with 1/1 which satisfies the condition. Suppose we have created a set of possible fractions $x/y$ that all satisfy $1/2\le x/y \le 1$...
7 replies | 140 view(s)
• Yesterday, 05:54
MarkFL replied to a thread Evolution Self-Destructs in Chat Room
Haha...you went straight for the big gun..."Darwin's Bulldog" himself.
10 replies | 134 view(s)
• Yesterday, 04:27
I just thought I would share with MHB members Duistermaat and Kolk "Remark on notation". This remark occurs after the definition of directional and...
3 replies | 45 view(s)
• Yesterday, 00:56
If we integrate, we get: \ln|f(x)|=C-x This implies: f(x)=\pm e^{C-x}=\pm e^Ce^{-x} Now, let c_1=\pm e^{C} and also let $c_1=0$...
7 replies | 95 view(s)
• Yesterday, 00:34
You haven't studied integration yet?
7 replies | 95 view(s)
• Yesterday, 00:15
Let's use the notation of Leibniz and write: \d{f}{x}=-f(x) Now what if we separate variables and write: \frac{1}{f(x)}\,df=-dx We have...
7 replies | 95 view(s)
• February 22nd, 2018, 23:41
Hello, and welcome to MHB! (Wave) Do you mean: f(x)=-f'(x) ?
7 replies | 95 view(s)
• February 22nd, 2018, 23:30
I am reading "Multidimensional Real Analysis I: Differentiation" by J. J. Duistermaat and J. A. C. Kolk ... I am focused on Chapter 2:...
3 replies | 45 view(s)
• February 22nd, 2018, 23:01
I am reading "Multidimensional Real Analysis I: Differentiation" by J. J. Duistermaat and J. A. C. Kolk ... I am focused on Chapter 2:...
0 replies | 27 view(s)
• February 22nd, 2018, 22:24
MarkFL replied to a thread Evolution Self-Destructs in Chat Room
According to what I could find online, Dr. Morris is a young Earth creationist with a degree in geological engineering. If you can point to the peer...
10 replies | 134 view(s)
• February 22nd, 2018, 22:14
MarkFL replied to a thread Evolution Self-Destructs in Chat Room
This argument sounds very similar to: Watchmaker analogy The above article contains some noteworthy criticisms of the analogy. :)
10 replies | 134 view(s)
• February 22nd, 2018, 15:25
It's a "rite of passage" for calculus students. (Smile)
3 replies | 55 view(s)
• February 22nd, 2018, 12:48
Right. So what that means is that there is no angle $\alpha$ that specifically has $\sin\alpha=\frac 1n$ (rational) and also a rational...
8 replies | 143 view(s)
• February 22nd, 2018, 09:04
By that logic that would hold for any angle, wouldn't it? But it doesn't, since with $\alpha=\arctan(3/4)$ both $\cos\alpha$ and $\sin\alpha$ are...
8 replies | 143 view(s)
• February 22nd, 2018, 07:20
l will now attempt to, explicitly, complete the demonstration that Df(a) v = \sum_{ 1 \le j \le n } v_j D_j f(a) \ \ \ \ (v \in \mathbb{R}^n ) ...
4 replies | 77 view(s)
• February 22nd, 2018, 04:29
Yep. (Nod)
14 replies | 200 view(s)
• February 22nd, 2018, 01:11
Here is an attempt to show Df(a) v = \sum_{ 1 \le j \le n } v_j D_j f(a) \ \ \ \ (v \in \mathbb{R}^n ) Now we have ... Df(a) v =...
4 replies | 77 view(s)
• February 22nd, 2018, 00:59
Thanks Country Boy ... ... appreciate the help ... Peter
4 replies | 77 view(s)
• February 22nd, 2018, 00:54
Thanks GJA ... that was really helpful ... Still reflecting on what you have said ... Thanks again ... Peter
2 replies | 63 view(s)
• February 21st, 2018, 23:26
Here is this week's POTW: Let $ABCD$ be a convex quadrilateral with $\overline{AB}=\overline{AD}$. Let $T$ be a point on the diagonal...
0 replies | 47 view(s)
• February 21st, 2018, 23:21
No one answered this weeks POTW...my solution follows: (a) Apply conservation of angular momentum (subscripts of $R$ pertain to the rod, while...
2 replies | 162 view(s)
• February 21st, 2018, 18:27
Conceptually an integral corresponds to the area under a graph. If that graph extends to infinity, the height of the graph must approach zero, since...
14 replies | 200 view(s)
• February 21st, 2018, 18:06
Erm... then I'm not quite sure what I can use or not. Can you perhaps use the fact that a series $x_1 + x_2 + ...$ can only converge if $x_n \to 0$?...
14 replies | 200 view(s)
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### 37 Visitor Messages

1. Hello and welcome back to MHB, mathmaniac!

We are happy to see that you have returned, and we look forward to your continued participation here!

On Behalf Of MHB's Staff,

MarkFL.
2. Hello and welcome back to MHB, mathmaniac!

We are happy to see that you have returned, and we look forward to your continued participation here!

On Behalf Of MHB's Staff,

MarkFL.
3. LOL! Kind of obvious, eh?

But yes, I created a vBulletin product that will welcome new and returning members via visitor message, drawing randomly from a list of staff members who have signed on to be the authors of such messages.
4. Hello and welcome back to MHB, mathmaniac!

We are happy to see that you have returned, and we look forward to your continued participation here!

On Behalf Of MHB's Staff,

MarkFL.
5. Happy Birthday! Hope you had a nice one!
6. Thanks!
7. I live in the central part of Sri Lanka from the time I was born. Only the north and north eastern parts of Sri Lanka was heavily effected by the war. There was a risk of bomb explosions and terrorist attacks all around the country but we weren't in the war zone and weren't directly effected by the war.
8. I don't have much of a liking for exams too. But you know, they are there and will be there in times to come. If you are getting A's and A+'s for all your exams that should be thought of as a privilege at least. When I was in school, I rarely got good grades and most of the time I was the 22~27th in the class (out of about 30~36 students). The problem about this is that I was told by many people to study harder and achieve something better. So if you can achieve A's and A+'s effortlessly that is something to be quite happy about.

Yes, the war in Sri Lanka is completely over, which I think is a great thing indeed.
9. Why don't you think it's a big deal? But in a way, taking it casually is also great 'cause you'll not get pressurized by the feeling that you have to continue getting A+'s.
10. Wow, all A+'s! That's wonderful to hear. Hope you'll be able to continue the good work.
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