Any complex problem can always be made easier to understand, analyze, and thus solve when it is laid out in visual form. Sets help us visualize the issue/problem and put the various data at their proper places. Sets thus help isolate each facet of the problem and can facilitate solving the problem one intersection at a time.
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Sets of what?
Yes, they can be very useful mathematical sets.
It is use full because they can all be map on to different members
Closed sets and open sets, or finite and infinite sets.
Joint sets are sets with common element/s. Disjoint sets are sets without any common element/s.