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location Algiers, Algeria
age 25
visits member for 1 year, 9 months
seen Jan 16 '13 at 20:47

Mar
17
awarded  Notable Question
Oct
18
awarded  Popular Question
Jan
16
comment set valued maps (liminf,limisup,…)
??? we use a metric d in the definition !
Jan
16
comment set valued maps (liminf,limisup,…)
please help me ≈_≈
Jan
16
comment set valued maps (liminf,limisup,…)
i say : $d(x,A_n)<\varepsilon$ and $d(x,B_n)<\varepsilon$ ?
Jan
16
comment set valued maps (liminf,limisup,…)
then how to finish the implication ? thank you
Jan
16
asked set valued maps (liminf,limisup,…)
Jan
15
comment Set-valued maps
thank you ^_^ .
Jan
15
accepted Set-valued maps
Jan
15
comment Set-valued maps
yes i known ...
Jan
15
comment Set-valued maps
Please , how can i proov this ? $\!\!\!\!\!\!\!\displaystyle\lim_{\quad \quad n\rightarrow \infty}\!\!\!\!\!\!\!\!\mbox{-inf} A_n=\bigcup_{N\in\mathbb{N}}\bigcap_{n>N} A_n$
Jan
15
comment Set-valued maps
$\displaystyle\underline\lim_{n\rightarrow \infty} A_n =\lbrace x\in E, \displaystyle\lim_{n\rightarrow \infty}d(x,A_n)=0 \rbrace$, $(E,d)$ is a metric space
Jan
15
comment Set-valued maps
$x \in (A_n)_\varepsilon \Leftrightarrow d(x,A_n) < \varepsilon$
Jan
15
comment Set-valued maps
is the $\varepsilon$-neighborhood of the set $A_n$
Jan
15
asked Set-valued maps
Jan
15
accepted Derivative of determinant of a matrix
Jan
14
awarded  Nice Question
Jan
13
awarded  Commentator
Jan
13
awarded  Self-Learner
Jan
13
comment Derivative of determinant of a matrix
what is the relation ?