15h
comment Will using the iphone camera flash as a flashlight for long periods harm it in any way?
My concern would be battery running down. But I guess you do this while plugged in?
15h
comment "Standard first term" of a series
Books (except by strange mathematicians) begin with Chapter 1, not Chapter 0.
15h
comment "Standard first term" of a series
... and then what about the same question for a sequence...
15h
comment The bathroom integral!
more digits: 0.79152271188278812399
16h
comment Evaluate the double sum $\sum_{m=1}^{\infty}\sum_{n=1}^{m-1}\frac{ 1}{m n\left(m^2-n^2\right)^2}$
Reverse the order of summation in $S_2$ and see what you get.
17h
answered Evaluate the double sum $\sum_{m=1}^{\infty}\sum_{n=1}^{m-1}\frac{ 1}{m n\left(m^2-n^2\right)^2}$
18h
comment Is about 50% of world population middle class?
Another definition in the article: 10 dollars to 100 dollars per day.
19h
answered Slightly weakened / altered concepts of a field
1d
comment Trying to show that $\sum_{1}^{\infty} \frac{n^n}{n!} $ diverges.
So it's your $\cong$ that's wrong.
1d
comment Radon-Nikodym derivative of Measures
Is the RD derivative you write about somehow related to the Radon-Nikodym derivative?
1d
comment is $dx$ greater than $\frac{dx}{2}$?
Even if $dy = f'(x)\,dx$, somehow considered numbers, it could be that $dx$ is negative, and then $dx/2$ is greater than $dx$.
1d
comment I cannot solve this question! HELP
See "help" above to discover what questions are appropriate here.
1d
comment Show $f$ is not continuous on $\mathbb{R}$
Maybe the problem is supposed to help you learn to use the $\epsilon, \delta$ definition of "continuous"?
1d
comment Show $f$ is not continuous on $\mathbb{R}$
Of course, first you have to show that continuity is equivalent to something about sequences.
1d
comment Show $f$ is not continuous on $\mathbb{R}$
You don't want "continuous on a set" you want "continuous at a point".
1d
comment Show $f$ is not continuous on $\mathbb{R}$
What is your definition of "continuous"... something with $\epsilon$ and $\delta$? Use that.
1d
comment calculus question ? please help
Here, you need to show your own work, give your own thoughts.
1d
comment How to show that the 3 events are independent but not pairwise independent
First, look up definition of "pairwise independent". Then check the equations involved using your events.
1d
comment Is about 50% of world population middle class?
The three linked articles are about three different things, so we need to fix which claim is to be skepticised.
1d
comment Compound Interest Calculation
When you ask this in math.stackexchange.com maybe we will be able to answer you.
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