Marsh Griffiths
12/03/2023 · High School

Exercise 2: Let \( A=\left\{\frac{n}{m n+1} ;(m, n) \in \mathbb{N}^{* 2}\right\}, B=\left\{\frac{n}{m n+1} ;(m, n) \in \mathbb{N}^{2}\right\} \) two non-empty subsets of \( \mathbb{R} \). 1) Show that if they are bounded above and below ? 2) Give if they exist, the lower bound and the upper bound, the maximum and the minimum of \( A \) and \( B \). 3) far \( x \in \mathbb{R}, \alpha \in \mathbb{Z} \), Show that: \( [x]+a \).

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1) Sets \( A \) and \( B \) are bounded below by \( \frac{1}{2} \) and \( 0 \) respectively, and bounded above by \( 1 \). The minimum of \( A \) is \( \frac{1}{2} \) and the maximum is \( 1 \), while the minimum of \( B \) is \( 0 \) and the maximum is \( 1 \). 2) The sum \( [x] + a \) is an integer for any \( x \in \mathbb{R} \) and \( a \in \mathbb{Z} \).

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