The theorem is attached. Thank you.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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The theorem is attached. Thank you.

Let ACR. Prove that A is closed and bounded if and only if every sequence of numbers from A has
a subsequence that converges to a point in A. Deduce Theorem 4.12 from this result.
Transcribed Image Text:Let ACR. Prove that A is closed and bounded if and only if every sequence of numbers from A has a subsequence that converges to a point in A. Deduce Theorem 4.12 from this result.
THEOREM 4.12. Let A CR. Then the following are equivalent.
(1) A is compact.
(2) A is closed and bounded.
(3) If (an) is a sequence of numbers in A, then there is a subsequence (an) that converges to a
point in A.
Transcribed Image Text:THEOREM 4.12. Let A CR. Then the following are equivalent. (1) A is compact. (2) A is closed and bounded. (3) If (an) is a sequence of numbers in A, then there is a subsequence (an) that converges to a point in A.
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