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Is the complement of the complement of a universal set is called a null set?

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What are the relationship between sets universal complement and null set.?
I was told once that the null set is the compliment to the universal set... I'm not convinced of this, however because the null set is a subset of the universal set as well. While I can't think of...
What are the example of complement of a set?
The letters in this answer are a set. The complement of that set is all the letters in the alphabet not in the first sentence. So the letter z is in the complement and the letter t is in the set....
Universal set minus null set is equal to?
Universal set.
What is complements of a set?
Given a Universal set, U, and a set X, the complement of X in U consists of all elements of U that are not in X.Note that the complement of the set X will be different in different Universal sets.
Is the complement of the set of odd integers is the set of even integers?
It is if we only consider integers. If we consider all real numbers, for example, it would not be.