Dopełnienie SET

COMPLEMENT OF A SET Let U be a universal set, it means a set including all the
sets under discussion (some space).
The complement of A in U is the set of all elements of
U, that are not in A (difference of U and A):
A = U \ A = {a : a ∈ U ∧ a /∈ A}.
Example:
If we take U = R, then: Q = IQ.
The difference can be expressed in terms of the
complement: A \ B = A ∩ B.
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