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Each of the sets described so far, have a definite number of elements, for example the set {red, green} has 2 members and the set {1, b, 3, blue} has four members. |
Each of the sets described so far, have a definite number of elements, for example the set {red, green} has 2 members and the set {1, b, 3, blue} has four members. |
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It is also possible for a set to have no members, or in other words to have zero members. Such a set is said to be the '''empty set'' or the ''null set'' and is denoted by |
It is also possible for a set to have no members, or in other words to have zero members. Such a set is said to be the '''empty set''' or the '''null set''' and is denoted by {} or the symbol ∅. Since every empty set For example the set of all people living on the moon, has (as of 2004) zero members. |
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Like the number zero, seemingly trivial, the empty set turns out to be quite important in mathematics. |
Like the number zero, seemingly trivial, the empty set turns out to be quite important in mathematics. |
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