General to Specific Ordering
H1 = <Sunny, ?, ?, Strong, ?, ?>
H2 = <Sunny, ?, ?, ?, ?, ?>
H2 is more general than H1
Def: let Hj and Hk be boolean-valued functions defined over X. (Hj(instance)=1 means instance satisfies hypothesis)
Then Hj is more general than or equal to Hk iff
?x ? X [(Hk(x)=1) ? (Hj(x)=1)]