Arithmetic may not be of any help.
If one set is all people whose name begins with A and the second set is all people who are studying English, then the intersection is all people with initial A who are studying English. Not much help from arithmetic there!
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is the result after doing intersection on 2 or more sets. It contains the elements which are common to all the sets on which intersection were done.
No, because the intersection of two equivalent sets will have a union the same size as its intersection.
Disjoint sets are sets whose intersection, denoted by an inverted U), produces the null or the empty set. If a set is not disjoint, then it is called joint. [ex. M= {1,2,A} N = {4,5,B}. S intersection D is a null set, so M and N are disjoint sets.
The intersection of two sets S and T is the set of all elements that belong to both S and T.
That is called the intersection of the sets.