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There are three axioms that must be satisfied for a collection of subsets, t, of set B to be called a topology on B.

1) Both B and the empty set, Ø, must be members of t.

2) The intersection of any two members of t must also be a member of t.

3) The union of any family of members of t must also be a member of t.

If these axioms are met, the members of t are known as t-open or simply open, subsets of B.

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Q: What axioms must be satisfied for a collection of subsets to be called a topology on a set?
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