robjohn

West Hills, CA

none

Age: 55

the mean square The Mean Square
(with one standard deviation and several unusual ones)

aka Rob Johnson

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59m
comment Correction factor for the variance
This might be a duplicate of this question.
1h
comment Finding the sum of the trigonometric serie:
Since $i$ has a very special meaning in complex analysis, you might want to choose a different index of summation. Ah, I see you just did. :-)
1h
comment The norm $\|f_n-f\|_{L^1} \to 0$ but $f_n \not\to f$
(+1) I was thinking of a very similar sequence (mine was based on powers of $2$, but that was for ease of bookkeeping). I think this example brings out the essence of what is going on very nicely.
2h
answered Show that the series is absolutely convergent
5h
revised Proof - Area of a cyclic quadrilateral
add a couple of links and improve exposition
6h
revised Proof - Area of a cyclic quadrilateral
add a couple of links and improve exposition
19h
answered Proof - Area of a cyclic quadrilateral
1d
comment Area inside loop of polar equation, unsolvable problem?
$\sec^2(\theta)$ is not integrable near $\pi/2$. The integral does not converge on $[0,\pi]$.
1d
comment Area inside loop of polar equation, unsolvable problem?
@Ninja7777: Something is wrong. You are integrating a positive function and getting a negative value.
1d
answered I can use MVT on $\lim _{_{x\rightarrow \infty }}\int _0^x\:e^{t^2}dt$?
Apr
24
comment What's 4 times more likely than 80%?
would the downvoter care to comment?
Apr
24
revised solutions such that a combination number is odd
note that since $n$ is not allowed to be $0$, there are cases where no $n$ can be found
Apr
24
comment solutions such that a combination number is odd
@user17762: The question was to find the largest $n\le m$.
Apr
24
comment solutions such that a combination number is odd
So you just need to describe the greatest $n\le m$ which has this property.
Apr
24
revised solutions such that a combination number is odd
give a link to one's complement
Apr
24
revised solutions such that a combination number is odd
mention Kummer's Theorem
Apr
24
answered solutions such that a combination number is odd
Apr
24
revised Show convergence/divergence for $\sum_{n=1}^{\infty} \frac{{(\ln n)}^{2}}{{n}^{2}} $
add a numerical estimate
Apr
24
revised Computing Residues Confusion
make \Res a command so it appears correct and is shorter
Apr
24
comment Computing Residues Confusion
@Telon: now that it's been edited, yes, they are.
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