Members.
An 'Empty Set' or a 'Nul Set'.
Strength
That is called the UNION of the two sets.
If all elements of set A are also elements of set B, then set A is a subset of set B.
a set having no elements, or only zeros as elements.
Those are called the elements of the set.
A set is a collection of objects called ELEMENTS OR MEMBERS.
A set that contains no elements is called an empty set, often denoted by the symbol ∅ or {}. If a set contains a natural number of elements, it is simply referred to as a finite set. Thus, the classification of the set depends on whether it has zero elements (empty set) or a positive count of natural numbers.
Members outside of a set are called "elements not in the set" or "complementary elements." In set theory, the complement of a set refers to all elements in the universal set that are not part of the specified set. These elements can be denoted using the complement notation, often represented by a prime symbol or a bar over the set.
Empty set or null set
The number of elements in a set is called the "cardinality" of the set. It represents the size or count of distinct elements contained within that set. For example, a set containing three elements has a cardinality of three.
An 'Empty Set' or a 'Nul Set'.
That is called the average or mean.
a set which has no elements in it is called a null set. example - A={}.
This is called the complement of the set.
In mathematics, a finite set is a set that has a finite number of elements. For example, (2,4,6,8,10) is a finite set with five elements. The number of elements of a finite set is a natural number (non-negative integer), and is called the cardinality of the set. A set that is not finite is called infinite. For example, the set of all positive integers is infinite: (1,2,3,4, . . .)
Strength