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Prove Theorem 7.14. That is, show that if ak is a sequence that converges to L, then every subsequence ofak also converges to L

Short Answer

Expert verified

Proved that every subsequence of the sequence akconverges to the same limit L

Step by step solution

01

Step 1. Given information

The given sequence ak converging to limit L

02

Step 2. Finding the subsequence of ak

For given >0,there exists a positive integer Nsuch that

ak-L<forkN

Since akis a subsequence of sequence ak; therefore

nkk

The inequalities kNandnkkimpliesnkk

Thus,for given >0,there exists a positive integer N such that

ank-L<fornkk

Thus,subsequence ank converges to L

Therefore,every subsequence of the sequenceak converges to the same limitL

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