Given a set of numbers and numbers
and
Let ;
=
Similarly,
;
=
and
;
=
Now, consider a subset of C,
The question is to find the minimal cardinality of the subset of A, such that
Given a set of numbers and numbers
and
Let ;
=
Similarly,
;
=
and
;
=
Now, consider a subset of C,
The question is to find the minimal cardinality of the subset of A, such that