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Apr
30
reviewed Approve Quick question, does $\sin^2(4x) + \cos^2 (4x)$ equal 1?
Apr
29
comment $2^n$ subsets of set with $n$ elements $\overset{?}{\implies}$ $\mathbb{R}$ has $2^\infty=\infty$ subsets
@AsafKaragila : Thanks, I assumed $\infty$ is assumed to be same as the set of natural numbers, but it might not be the case.
Apr
29
comment $2^n$ subsets of set with $n$ elements $\overset{?}{\implies}$ $\mathbb{R}$ has $2^\infty=\infty$ subsets
google.com.au/search?q=cardinality+of+power+set
Apr
29
answered $2^n$ subsets of set with $n$ elements $\overset{?}{\implies}$ $\mathbb{R}$ has $2^\infty=\infty$ subsets
Apr
29
comment $2^n$ subsets of set with $n$ elements $\overset{?}{\implies}$ $\mathbb{R}$ has $2^\infty=\infty$ subsets
No, there are $2^{\infty}$ subsets, it has different cardinality than $\infty$ subsets.
Apr
19
comment Is there an identity for $\sum\limits_{n=1}^\infty \frac{1}{k^n}$?
@ThomasAndrews : My fault, apologies, I was confused by the usage of n and k, tried to edit to something more conventional ( I think).
Apr
19
comment Is there an identity for $\sum\limits_{n=1}^\infty \frac{1}{k^n}$?
@Zev : sorry, was just writig to you about the edit.
Apr
19
comment Is there an identity for $\sum\limits_{n=1}^\infty \frac{1}{k^n}$?
@Zev : Do you think n should be used for upper limit and k as the index of summation? seeing k and usage like this is unfamiliar. Of course the answer is the same either way but it looks a bit odd
Apr
19
comment Is there an identity for $\sum\limits_{n=1}^\infty \frac{1}{k^n}$?
the usage of k,n in the summation was not conventional. I modified to what I think should be the more conventional way, please review.
Apr
19
revised Is there an identity for $\sum\limits_{n=1}^\infty \frac{1}{k^n}$?
changed the indices to the usual ones.
Apr
17
comment What is the probability of this home work question?
Calculate the probability of a machine being good, then remve a good machine, calculate the probability of a machine being good, remove the machine, what is the answer for 4 machines being good?
Apr
17
revised $(a - b \cot \theta) \cos^2 \theta = -\frac{b}{2} \cot \theta$ ,$\theta=$?
edited title
Apr
17
revised $\int \frac{1}{\sqrt{a-x^{-1}}} \, dx$
edited title
Apr
17
revised $\int \frac{\tan x}{x} dx$
edited title
Apr
16
revised $\lim_{n\rightarrow \infty} \frac{1}{n^{3}}\sum_{k=1}^{n-1}k^2 $
removed display style from title
Apr
16
revised Evaluating $\lim_{n\to\infty} e^{-n} \sum\limits_{k=0}^{n} \frac{n^k}{k!}$
removed redundant text from title
Apr
16
revised Methods to find $\lim\limits_{n\to\infty} \frac{1}{n} \sum_{k=1}^{n} n^{1/k} $
removed the redundant parts from the title
Apr
11
revised Simplifying $\sum\limits_{k=1}^{n-1} (2k + \log_2(k) - 1)$
added 2 characters in body; edited title
Apr
10
revised Derivative of $ C_m = \frac{{|x|}e^{2x}}{\pi^{1/2}}\int_0^t \alpha ^{-\beta/2}e^{\frac{-x^2}{\alpha}-\alpha } \mathrm d\alpha $
edited title
Apr
9
comment Find the sum for $\sum_{n=1}^{\infty}(-1)^{(n+1)}\frac{2n+1}{3^n} $
@TMM : Already did that, consensus varies, and each side has it point. Personally I do not believe that it "must" be some way, but that pro grammatically it should be possible to have different views concise, expanded and even maybe customized. By trying it every now and then I hope to get some responses to guide me and come up with some ideas to propose. I really can't see myself waging a text massaging campaign without feedback.