I was thinking about this. My intuition is that there is a counterexample. Suppose f : [

rmd1228887e

rmd1228887e

Answered question

2022-07-04

I was thinking about this. My intuition is that there is a counterexample. Suppose f : [ 0 , 1 ] R is continuous. Also suppose

1. If q Q , then f ( q ) Q .
2. f ( 0 ) < 0
3. f ( 1 ) > 1

By the Intermediate Value Theorem, for any rational number r with 0 < r < 1 there is an x with 0 < x < 1 such that f ( x ) = r. Is this true of the restriction f : Q Q .

Answer & Explanation

owerswogsnz

owerswogsnz

Beginner2022-07-05Added 12 answers

f ( q ) = 3 q 2 1

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