Intersection (set theory): theory), Mathematics, Set (mathematics), If and only

Subspace Topology: Topology, Mathematics, Topological Space, Subset, If and Only if, Intersection (Set Theory)

Transitive Closure: Relation, Binary Set (Mathematics), Intersection (Set Theory), Family (Mathematics)

Hyperplane Section: Mathematics, Projective Space, Intersection (set theory),

Singleton (Mathematics): Mathematics, Set (Mathematics), Unique, If and Only If, Cardinality