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 Curious
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  • 11 votes cast
Jan
18
awarded  Promoter
Nov
28
accepted Given a set $A$ such that for any family of sets $F$: if $\cup F = A$ then $A \in F$.
Nov
28
comment Given a set $A$ such that for any family of sets $F$: if $\cup F = A$ then $A \in F$.
I know why but i dont know how to explain it.. the answer is: A doesn't belong to F because of the definition of F..
Nov
28
revised Given a set $A$ such that for any family of sets $F$: if $\cup F = A$ then $A \in F$.
edited title
Nov
28
comment Given a set $A$ such that for any family of sets $F$: if $\cup F = A$ then $A \in F$.
can you give me an exaple of A and F? I think I dont really know what is F.. thank you!
Nov
28
comment Given a set $A$ such that for any family of sets $F$: if $\cup F = A$ then $A \in F$.
@DonAntonio, you are right. I translated the word to english and use a group instead of a set.
Nov
28
revised Given a set $A$ such that for any family of sets $F$: if $\cup F = A$ then $A \in F$.
deleted 4 characters in body
Nov
28
asked Given a set $A$ such that for any family of sets $F$: if $\cup F = A$ then $A \in F$.
Nov
25
comment Prove that if $ |a_n-a_{n-1}| < \frac{1}{2^{n+1} }$ and $a_0=\frac12$, then $\{a_n\}$ converges to $0<a<1$
thank you Marty, but what's about: 0 < a < 1 ? does it show me that?
Nov
24
comment Prove that if $ |a_n-a_{n-1}| < \frac{1}{2^{n+1} }$ and $a_0=\frac12$, then $\{a_n\}$ converges to $0<a<1$
but what $a_n$ is?
Nov
24
asked Prove that if $ |a_n-a_{n-1}| < \frac{1}{2^{n+1} }$ and $a_0=\frac12$, then $\{a_n\}$ converges to $0<a<1$
Nov
23
awarded  Scholar
Nov
23
accepted what is $\displaystyle \lim_{n\to \infty }\ \left(\frac{1}{n}\right)^\frac{1}{\text{ln}\text{ ln}(n)}$
Nov
23
awarded  Supporter
Nov
23
comment what is $\displaystyle \lim_{n\to \infty }\ \left(\frac{1}{n}\right)^\frac{1}{\text{ln}\text{ ln}(n)}$
wow, thank you! although I didn't learn the operating of 'log', now I know it thanks to you! thank you!
Nov
23
awarded  Editor
Nov
23
revised what is $\displaystyle \lim_{n\to \infty }\ \left(\frac{1}{n}\right)^\frac{1}{\text{ln}\text{ ln}(n)}$
added 75 characters in body
Nov
23
asked what is $\displaystyle \lim_{n\to \infty }\ \left(\frac{1}{n}\right)^\frac{1}{\text{ln}\text{ ln}(n)}$
Nov
15
comment proof of limits in math: if $a_n^3\to a^3$, then $a_n\to a$.
I'm sorry, but I don't know what to do if a is not zero. is it not the case that I wrote? :/ and you are right! the sequence is a sequence of real numbers..
Nov
15
awarded  Student