Thanks to Satyaki and Kaushik for your help. It helps me.

Regards
Madan Gopal Kundu

--- In Statisticians_group@..., KAUSHIK BHATTACHARJEE
<kabonline07@...> wrote:
>
>
> Countable means in principle you can count ..even if the toatl number of sets
happen to be infinte.
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> A1, A2,....Ai,.... are sets then UAi, i varies from 1 to infinityor any
partcular number,say,'n' -both are examples of  countable union of sets
>  
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> Kaushik Bhattacharjee
>
> --- On Sun, 8/30/09, Satyaki Mazumder <satyaki1983@...> wrote:
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> From: Satyaki Mazumder <satyaki1983@...>
> Subject: Re: [Statisticians_group] Countable Union
> To: Statisticians_group@...
> Date: Sunday, August 30, 2009, 8:07 PM
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> Respected Sir,
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> Countable means what you can count. In mathematical words, a set is called
countable if there exists a one to one mapping from set of natural numbers to
that set.
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> So now, if you have collection of sets those you can count, i.e., like set1,
set2, set3, ... and then if you define a set A=union of these set1, set2,
set3,... then you will get a set which is countable union of sets. Countable
means not finite, finite is a special case of countable.
>
> Hope this clarifies a little bit. Beg your pardon for limited knowledge.
>
>
> --- On Mon, 8/31/09, Madan Kundu <madan4331@yahoo. co.in> wrote:
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> From: Madan Kundu <madan4331@yahoo. co.in>
> Subject: [Statisticians_ group] Countable Union
> To: statisticians_ group@yahoogroup s.co.in
> Date: Monday, August 31, 2009, 5:48 AM
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> Hello,
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> Can only please help me in explaining the idea about the 'Countable Union (of
sets)'?
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> Thanks in advance.
>  
> Regards
> Madan
>
>  
>
>
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