Dec1-08, 03:26 PM
A is a non empty group which is bounded from the top.
prove that S=sup A if and only if S is the upper bound of of A
and there i a series of numbers An (An which belongs to A) so An->S
i was proposed a general solution:
presume that supA=S
show that there is a series An (An belongs to A) so lim An=s (n goes to infinity)
and there is a sketch here:
how to make a formal proof for it??
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