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bio website rbribeiro.wordpress.com
location Brazil
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visits member for 2 years, 2 months
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Eles passarão... Eu passarinho...


Dec
12
awarded  Tenacious
Dec
9
comment Show that this is the limit
Yeeeeessss! That is it!
Dec
8
comment Show that this is the limit
AlexR's answer is exactly about this question. Just change $C$ in his answer by $\|f\|_{\infty} - \epsilon$
Dec
8
comment Show that this is the limit
$\|f\|_\|{\infty}$ is exactly what AlexR commented above. That definition implies that your set $A$ has positive measure. We don't want to prove $m(A) > 0$ we already know that from $\|f\|_{\infty}$. When you take the limit at both sides of the last inequality in may answer you get that $\lim_{p\rightarrow \infty} ||f||_p > \|f\|_{\infty} - \epsilon$ for all $\epsilon$... Did I make it clear?
Dec
8
comment Show that this is the limit
$m(A) > 0$ by the definition of $ess sup \|f\|$. You don't have to care about $m(A)$, since it is positive. You just have to show what I wrote above: $\lim_{p \rightarrow \infty} \|f\|_p > ||f||_\infty - \epsilon$. Because you already have that $\lim_{p \rightarrow \infty} \|f\|_p \le ||f||_\infty$.
Dec
8
answered Show that this is the limit
Dec
7
comment if a sequence is square summable can its sum oscillate between +/- infinity?
I believe you meant $S_n$ instead of $a_n$, right?
Dec
5
answered How many decimal strings of length 55 contain exactly ten 7s?
Dec
4
comment Probability of the existence of a path of a specified length between any tw0 vertices in a random graph
Trying to revive the discussion... The problem is equivalent of guarantee that the diameter of $G(n,p)$ is bounded below by $l$. Well, results about $D(G(n,p))$ are already known. if $k<1$ the graph isn't connected $a.a.s$... And are already know the right order of $D(G(n,p))$ if $k$ is large enough... Maybe this can help iis.ee.ic.ac.uk/~m.draief/file/Home_files/…
Dec
3
comment probability that at least one observation of a random sample
I didn't get it. The binomial distribution is not continuous.
Dec
3
comment Nobody told me that self teaching could be so damaging…
Here in Brazil, if you feel confident enough, you can ask a special treatment. What we call "Exame de proeficiência". If you already know some course and you don't want to take classes, you can do just one exam covering the entire course. If you pass they approve you. So you could ask for the exam of all courses. If you pass then you receive the title of Bachelor in Mathematics. Theoretically you could do the graduation in just one week... But all the guys who tried this way failed...
Dec
3
comment probability that at least one observation of a random sample
Did you try something? Maybe you have an idea and we could think together...
Dec
3
revised How to use expectation of a random variable to prove its distribution?
added 414 characters in body
Dec
3
answered How to use expectation of a random variable to prove its distribution?
Dec
2
revised Chebyshev Application
edited body
Dec
2
answered Chebyshev Application
Dec
2
answered series involving a logarithm of ${1\over ln^2(n)}$
Nov
30
comment How to use expectation of a random variable to prove its distribution?
More simpler, once you have the characteristic function you have that two distributions have the same CF if, and only if, they are the same... The CF of a $N(0,1)$ is $e^{-t^2/2}$ use the Taylor Expansion of $e^x$...
Nov
30
comment How to use expectation of a random variable to prove its distribution?
Once you know all the moments you determine the characteristic function of $X$, then you can use the formula of inversion to obtain the CDF. en.wikipedia.org/wiki/…
Nov
30
answered Product of a Rademacher and a standard normal random variable