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4. The goal of this problem is to justify the following statement by using the Comparison Test for series. Suppose that a, and bm are convergent series with an, b, 20 for all natural numbers n. Then, a,b,, is also a convergent series. (a) By only using the Comparison Test and the following fact (FACT 1), justify that if a, 2 0 for all n and a, is convergent, then is also convergent. n=1 n=1 FACT 1: if a, 2 0 for all n and a, is convergent, then a < a, forn > M for some natural number M. (b) Byonly using the Comparison Test and the following fact (FACT 2), justify that if a,, b, 20 for all n and an: E b are convergent, then n is also convergent, where en is the maximum of an and bn. FACT 2: If a,, bn 2 0 for all n and 4 Ebn are convergent, then a,+ bn is n=1 n=1 also convergent. (c) By only using the Comparison Test and statements in (a) and (b), justify that if a, and bn are convergent and an, b, 2 0 for all natural numbers n, then n=1 > anb, is alsO convergent. 2.

4. The goal of this problem is to justify the following statement by using the Comparison Test for series. Suppose that a, and bm are convergent series with an, b, 20 for all natural numbers n. Then, a,b,, is also a convergent series. (a) By only using the Comparison Test and the following fact (FACT 1), justify that if a, 2 0 for all n and a, is convergent, then is also convergent. n=1 n=1 FACT 1: if a, 2 0 for all n and a, is convergent, then a < a, forn > M for some natural number M. (b) Byonly using the Comparison Test and the following fact (FACT 2), justify that if a,, b, 20 for all n and an: E b are convergent, then n is also convergent, where en is the maximum of an and bn. FACT 2: If a,, bn 2 0 for all n and 4 Ebn are convergent, then a,+ bn is n=1 n=1 also convergent. (c) By only using the Comparison Test and statements in (a) and (b), justify that if a, and bn are convergent and an, b, 2 0 for all natural numbers n, then n=1 > anb, is alsO convergent. 2.

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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4. The goal of this problem is to justify the following statement by using the Comparison Test for series. Suppose that a, and bm are convergent series with an, b, 20 for all natural numbers n. Then, a,b, is also a convergent series. (a) By only using the Comparison Test and the following fact (FACT 1), justify 2 0 for all a and , is convergent, then is also convergent. that if n=1 FACT 1: if a, 2 0 for all na and a, is convergent, then a < an for n 2 M for some n=1 natural number M. (b) By only using the Comparison Test and the following fact (FACT 2), justify that if an, be 20 for all a and an:bn are convergent, then Cn is also convergent, n=1 where en is the maximum of an and ba. FACT 2: If a,, b, 2 0 for all n and bn are convergent, then an + b, is n=1 n=1 also convergent. (c) By only using the Comparison Test and statements in (a) and (b), justify that if a, and bn are convergent and an, b, 2 0 for all natural numbers n, then n=1 > anb, is alsO convergent. n=1
Transcribed Image Text:4. The goal of this problem is to justify the following statement by using the Comparison Test for series. Suppose that a, and bm are convergent series with an, b, 20 for all natural numbers n. Then, a,b, is also a convergent series. (a) By only using the Comparison Test and the following fact (FACT 1), justify 2 0 for all a and , is convergent, then is also convergent. that if n=1 FACT 1: if a, 2 0 for all na and a, is convergent, then a < an for n 2 M for some n=1 natural number M. (b) By only using the Comparison Test and the following fact (FACT 2), justify that if an, be 20 for all a and an:bn are convergent, then Cn is also convergent, n=1 where en is the maximum of an and ba. FACT 2: If a,, b, 2 0 for all n and bn are convergent, then an + b, is n=1 n=1 also convergent. (c) By only using the Comparison Test and statements in (a) and (b), justify that if a, and bn are convergent and an, b, 2 0 for all natural numbers n, then n=1 > anb, is alsO convergent. n=1
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