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Dec
21
comment Is it valid to calculate standard deviation for n=2?
@YvesDaoust the first one was my intuition too - no indeterminacy: $$\sigma^2 = \frac{1}{n} \sum_{k = 1}^n (x_k - \mu)^2 = \frac{(x_1 - \mu)^2}{1} = 0$$ since $x_1 = \mu$...
Dec
21
revised is linear independence preserved under isomorphism?
added 2 characters in body; edited title
Dec
21
comment Is it valid to calculate standard deviation for n=2?
@YvesDaoust interesting -- why? If you the entire population of 1 element, its distance from itself is certainly 0...
Dec
21
comment what is the complement of empty language?
why woould you think there is smtth wrong?
Dec
21
answered Evaluate $\int \frac{1}{\sin x+\sec x}\,dx $
Dec
21
revised expectation and geometrical probability problem
edited tags
Dec
21
answered Is it valid to calculate standard deviation for n=2?
Dec
21
answered Turing Machine divisibility by 6
Dec
21
revised Turing Machine divisibility by 6
edited tags
Dec
21
comment comparing probability of different size
@jonnyLee you are talking about the confidence interval of being corect for an item of each type
Dec
20
answered comparing probability of different size
Dec
18
answered General audience books that teach deep mathematics
Dec
18
answered Find the expectation value and the variance of the time that the man is waiting for the bus in one month
Dec
18
comment Calculate the determinant of the matrices $a_{ij}=\frac{1}{i+j-1}$ and $b_{ij}=\frac{1}{i+j}$?
Indices start from 1 or from 0?
Dec
18
revised Calculate the determinant of the matrices $a_{ij}=\frac{1}{i+j-1}$ and $b_{ij}=\frac{1}{i+j}$?
added 16 characters in body
Dec
18
comment Calculus contradiction?
does not answer OP's question - he asked why they are different, when they are supposed to be the same. You answered how to arrive at those answers...
Dec
18
revised Proof of convexity of in a quadratic function
added 79 characters in body
Dec
18
revised Are these two naive upper bounds ok?
added 33 characters in body
Dec
18
revised Showing a sequence is in $l^\infty$
added 7 characters in body
Dec
18
comment Limit involving exponentials of $\arcsin(x)$ and $\arctan(x)$
@user26977 he said no Taylor series