The set contained in another set is termed as a sub-set.
This would be a subset.
Any subset.
True.
a set of which all the elements are contained in another set.
a set whose members are other members of another set a set contained within them
This is called the complement of the set.
the answer is complement
Element
The set {2, -3.7, 16.33... (repeating)} is one possible set.
The root word of subset is "set." A subset is a set that is contained within another set.
A set A is a subset of a set B if A is "contained" inside B.