"In mathematics a field of sets is a pair (X, F) where X is a set and F is an algebra over X i.e., a subset of the power set of X, closed under complements of individual sets and under the union (hence also under the intersection) of pairs of sets, and satisfying X \in F. In other words, F forms a subalgebra of the power set Boolean algebra of X (with the same identity element X \in F)."
*nods* what
Set theory
@ifazk this is just the Wikipedia page lol