Vector Space, Topological Space, Mathematics, Math, Linear Algebra.
can say that the collection of all subsets, S = {{ }, {1, 3, 6}}, encompasses X and the empty set { }. Also, S = {{ }, {1}, {3}, {6}, {1, 6}, {3, 6}, {1, 3}, {1, 3, 6}} can form a topology and they belong to S ({1, 3} or {3, 6}… they all belong to S). Lastly, {1, 3} ∩ {3, 6} = {3} belongs to S = {{