Sets can be written in the following ways:
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Closed sets and open sets, or finite and infinite sets.
Given two sets A and B, the union is the set that contains elements or objects that belong to either A or to B or to both We write A U B Basically, we find A U B by putting all the elements of A and B together.
There are way more than just 2 methods. 1. Write down the elements, works well for finite sets. e.g.{1, 2, 3, pi, apple} 2. Sets have a pattern, P e.g. {a | a x b < 0} (of course provided ba ahead of time) 2' Sets have a symbol or a name e.g. Complex Numbers (denotes as a bolded C) 3. Countable sets, sets that can be written in a sequence. Sequence (an) Set {an}
Joint sets are sets with common element/s. Disjoint sets are sets without any common element/s.