Alon Shmiel
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 Feb14 comment Bernoulli integral (conservation of energy) thank you very much Tom! I think I will show them the both solutions, so I have one proof (of you). about the second proof: do you have a link with a solution of rewriting Euler equations to form (2.13)? and then the second solution will be the rewriting Euler equations to form (2.13) and after that I will write (2.14)-(2.19). BTW, what's about (2.1)-(2.12)? I don't need this? about your question, The lecturer wants me to lecture about this topic.. so I will have to learn the both solutions (I will learn it by myself when I get them).. thank you very very much! Feb14 revised Bernoulli integral (conservation of energy) added 272 characters in body Feb13 revised Bernoulli integral (conservation of energy) added 104 characters in body; edited title Feb12 revised Bernoulli integral (conservation of energy) added 57 characters in body Feb12 asked Bernoulli integral (conservation of energy) Jan21 awarded Tumbleweed Jan18 awarded Promoter Nov28 accepted Given a set $A$ such that for any family of sets $F$: if $\cup F = A$ then $A \in F$. Nov28 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.. Nov28 revised Given a set $A$ such that for any family of sets $F$: if $\cup F = A$ then $A \in F$. edited title Nov28 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! Nov28 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. Nov28 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 Nov28 asked Given a set $A$ such that for any family of sets $F$: if $\cup F = A$ then $A \in F$. Nov25 comment Prove that if $|a_n-a_{n-1}| < \frac{1}{2^{n+1} }$ and $a_0=\frac12$, then $\{a_n\}$ converges to \$0