Parenthesis indicate that the enclosed members are a set. The brackets indicate that what enclosed Êinside of itÊis an option.
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Any symbol can be used to denote a set of integers. The set of all integers is denoted by Z, and the set of natural numbers by N.
A set is a collection of objects called ELEMENTS OR MEMBERS.
It is used in set theory and its meaning depends on the way that it is facing. If the open end is to the right then it indicates that the first set is a subset of the second. If the open end is to the left then it indicates that the first set is a superset of the second (the second is a subset of the first).
The symbol for the set of integers is Z. This comes from the German Zahl, which means integer.
I presume you mean intersecting. Two sets are intersecting if they have members in common. The set of members common to two (or more) sets is called the intersection of those sets. If two sets have no members in common, their intersection is the empty set. In this case the sets are called disjoint.