involution<T> static method
Verifies the Involution Law.
Law: (A')' = A
The complement of the complement of a set equals the original set.
Implementation
static bool involution<T>(CustomSet<T> a, CustomSet<T> universal) {
final complement1 = SetOperations.complement(a, universal);
final complement2 = SetOperations.complement(complement1, universal);
return complement2.equals(a);
}