An operation performed on members of that set will
result in a member of the same set.
The set has a finite number of members, as opposed to
being infinitely large.
An expression belonging to a closed set cannot be used
to create an expression that is not of that set.
Members of a closed set cannot be added, subtracted,
multiplied, or divided.
1 answer
The correct definition for a set to be "closed" is:
An operation performed on members of that set will result in a member of the same set.
This means that if you take any two elements from the set and perform a specific operation (such as addition, multiplication, etc.), the result of that operation will also be an element of that same set.
