Minimal elements Let $A$ be the set $A = \{1,2,3,...,20\}$.
$R$ is the relation over $A$ such that $xRy$ iff $y/x = 2^i$, $i$ is natural including $0$.
I am supposed to find the minimal and maximal elements in relation to $R$.
Does that mean the elements are members of $A$ or members of $R$?
The elements of $R$ are pairs that their divisions yield $1,2,4,8,16 \ldots$
But I am confused as to whether I am searching for pairs in $R$ or numbers in $A$.
Thanks.

You're searching for members of $A$.
$a \in A$ is maximal, whenever $aRa'$ implies $a'=a$.
$a \in A$ is minimal, whenever $a'Ra$ implies $a'=a$.
