5. The set S contains some real numbers, according to the following three rules. (i) is in S. (ii) If is in S, where is written in lowest terms (that is, a and b have highest common factor 1), then is in S. b 2a (iii) If andare in S, where they are written in lowest terms, then + is in S. 1 These rules are exhaustive: if these rules do not imply that a number is in S, then that number is not in S. Can you describe which numbers are in S? For example, by (i), is in S. By (ii), since is in S, is in S. Since both and/ are in S, (iii) tells us is 2.1 in S. 1+3 1+2

5. The set S contains some real numbers, according to the following three rules. (i) is in S. (ii) If is in S, where is written in lowest terms (that is, a and b have highest common factor 1), then is in S. b 2a (iii) If andare in S, where they are written in lowest terms, then + is in S. 1 These rules are exhaustive: if these rules do not imply that a number is in S, then that number is not in S. Can you describe which numbers are in S? For example, by (i), is in S. By (ii), since is in S, is in S. Since both and/ are in S, (iii) tells us is 2.1 in S. 1+3 1+2

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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