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It is the set of all the things you are dealing with or considering.
For example, if I am looking at subsets that are even integers and I am looking at all integers, then the set of all integers is the universal set.
If we are looking at hair color, some subsets are redheads, blondes etc.
The universal sets is the set of all possible hair colors.
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What is complement of an empty set?
The complement of an empty set is universal set
What is null set in mathematics?
a set having no elements, or only zeros as elements.
What does a backwards 3 mean in mathematics?
Do you mean this symbol ∈ (or backwards 3) if so, it means is an element of; Also, ∉ (with strikethrough) (or backwards 3 with strikethrough) is the symbol for "is not an element of" used in set membership. See also Element (mathematics) and Set (mathematics)
What is set theory?
In mathematics, sets are simply collections of objects. Set theory is the branch of mathematics that studies these collections of objects. For more information, please refer to the related link below.
How many subsets are there in a set formed from the letters of the word mathematics?
In a set, as it is usually defined, elements can't be repeated. "Mathematics" has 8 distinct letters, so your set would have 8 letters. The number of possible subsets (this includes the empty set, and the set itself) is two to the power 8.
