Solution
= Solution
The <Fn forcing> order is
$$
\operatorname{Fn}(I,J)=\{p:p\text{ is a finite partial function }I\rightharpoonup J\}.
$$
It is ordered by reverse inclusion:
$$
q\le p\iff q\supseteq p,
$$
so a stronger condition specifies more values. Its maximal, or weakest, element is the empty function $\varnothing$.