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suppos £¨S£¬p) is compact
according to Borel-Lebsgue's theorem, S is sequentially compact
that is, every sequence in S has a convergent subsequence that converges to point in S
for any convergent sequence (Xn) in S, (Xn) has a convergent subsequence (Xk) that converges to point in S
Claim (Xn) and (Xk) converge to the same point(Õâ¸öÄã×Ô¼ºÖ¤Ã÷)
every convergent sequence converges to point in S
S is closed

Since S is closed and S is subset of R, it has maximum and minimum
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