(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

proof the theorem

if a l b and b l a then a=+-b

2. Relevant equations

3. The attempt at a solution

there exist integer p,q such that ap=b and bq=a, then i've no idea how i can relate it to a=+-b.. clue please T_T

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# Divisibility property

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