Suppose r1,r2, . . . is a sequence that contains every rational number. Let 1 1 F = R \U (rk 2k k=1 (a) Show that F is a closed subset of R. (b) Prove that if I is an interval contained in F, then I contains at most one element. (c) Prove that |F| = 00.

Algebra and Trigonometry (6th Edition)
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ISBN:9780134463216
Author:Robert F. Blitzer
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ChapterP: Prerequisites: Fundamental Concepts Of Algebra
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Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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12 Suppose rị,r2, . .. is a sequence that contains every rational number. Let
00
1
1
F = R \U (rk
rk
+
-
2k'
2k
k=1
(a) Show that F is a closed subset of R.
(b) Prove that if I is an interval contained in F, then I contains at most one
element.
(c) Prove that |F = 0.
Transcribed Image Text:12 Suppose rị,r2, . .. is a sequence that contains every rational number. Let 00 1 1 F = R \U (rk rk + - 2k' 2k k=1 (a) Show that F is a closed subset of R. (b) Prove that if I is an interval contained in F, then I contains at most one element. (c) Prove that |F = 0.
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